all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 33f4409fcfbb947545c3c8e6acc2ffdb6811209b 430747 bytes (raw)
name: lisp/window.el 	 # note: path name is non-authoritative(*)

    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144
  145
  146
  147
  148
  149
  150
  151
  152
  153
  154
  155
  156
  157
  158
  159
  160
  161
  162
  163
  164
  165
  166
  167
  168
  169
  170
  171
  172
  173
  174
  175
  176
  177
  178
  179
  180
  181
  182
  183
  184
  185
  186
  187
  188
  189
  190
  191
  192
  193
  194
  195
  196
  197
  198
  199
  200
  201
  202
  203
  204
  205
  206
  207
  208
  209
  210
  211
  212
  213
  214
  215
  216
  217
  218
  219
  220
  221
  222
  223
  224
  225
  226
  227
  228
  229
  230
  231
  232
  233
  234
  235
  236
  237
  238
  239
  240
  241
  242
  243
  244
  245
  246
  247
  248
  249
  250
  251
  252
  253
  254
  255
  256
  257
  258
  259
  260
  261
  262
  263
  264
  265
  266
  267
  268
  269
  270
  271
  272
  273
  274
  275
  276
  277
  278
  279
  280
  281
  282
  283
  284
  285
  286
  287
  288
  289
  290
  291
  292
  293
  294
  295
  296
  297
  298
  299
  300
  301
  302
  303
  304
  305
  306
  307
  308
  309
  310
  311
  312
  313
  314
  315
  316
  317
  318
  319
  320
  321
  322
  323
  324
  325
  326
  327
  328
  329
  330
  331
  332
  333
  334
  335
  336
  337
  338
  339
  340
  341
  342
  343
  344
  345
  346
  347
  348
  349
  350
  351
  352
  353
  354
  355
  356
  357
  358
  359
  360
  361
  362
  363
  364
  365
  366
  367
  368
  369
  370
  371
  372
  373
  374
  375
  376
  377
  378
  379
  380
  381
  382
  383
  384
  385
  386
  387
  388
  389
  390
  391
  392
  393
  394
  395
  396
  397
  398
  399
  400
  401
  402
  403
  404
  405
  406
  407
  408
  409
  410
  411
  412
  413
  414
  415
  416
  417
  418
  419
  420
  421
  422
  423
  424
  425
  426
  427
  428
  429
  430
  431
  432
  433
  434
  435
  436
  437
  438
  439
  440
  441
  442
  443
  444
  445
  446
  447
  448
  449
  450
  451
  452
  453
  454
  455
  456
  457
  458
  459
  460
  461
  462
  463
  464
  465
  466
  467
  468
  469
  470
  471
  472
  473
  474
  475
  476
  477
  478
  479
  480
  481
  482
  483
  484
  485
  486
  487
  488
  489
  490
  491
  492
  493
  494
  495
  496
  497
  498
  499
  500
  501
  502
  503
  504
  505
  506
  507
  508
  509
  510
  511
  512
  513
  514
  515
  516
  517
  518
  519
  520
  521
  522
  523
  524
  525
  526
  527
  528
  529
  530
  531
  532
  533
  534
  535
  536
  537
  538
  539
  540
  541
  542
  543
  544
  545
  546
  547
  548
  549
  550
  551
  552
  553
  554
  555
  556
  557
  558
  559
  560
  561
  562
  563
  564
  565
  566
  567
  568
  569
  570
  571
  572
  573
  574
  575
  576
  577
  578
  579
  580
  581
  582
  583
  584
  585
  586
  587
  588
  589
  590
  591
  592
  593
  594
  595
  596
  597
  598
  599
  600
  601
  602
  603
  604
  605
  606
  607
  608
  609
  610
  611
  612
  613
  614
  615
  616
  617
  618
  619
  620
  621
  622
  623
  624
  625
  626
  627
  628
  629
  630
  631
  632
  633
  634
  635
  636
  637
  638
  639
  640
  641
  642
  643
  644
  645
  646
  647
  648
  649
  650
  651
  652
  653
  654
  655
  656
  657
  658
  659
  660
  661
  662
  663
  664
  665
  666
  667
  668
  669
  670
  671
  672
  673
  674
  675
  676
  677
  678
  679
  680
  681
  682
  683
  684
  685
  686
  687
  688
  689
  690
  691
  692
  693
  694
  695
  696
  697
  698
  699
  700
  701
  702
  703
  704
  705
  706
  707
  708
  709
  710
  711
  712
  713
  714
  715
  716
  717
  718
  719
  720
  721
  722
  723
  724
  725
  726
  727
  728
  729
  730
  731
  732
  733
  734
  735
  736
  737
  738
  739
  740
  741
  742
  743
  744
  745
  746
  747
  748
  749
  750
  751
  752
  753
  754
  755
  756
  757
  758
  759
  760
  761
  762
  763
  764
  765
  766
  767
  768
  769
  770
  771
  772
  773
  774
  775
  776
  777
  778
  779
  780
  781
  782
  783
  784
  785
  786
  787
  788
  789
  790
  791
  792
  793
  794
  795
  796
  797
  798
  799
  800
  801
  802
  803
  804
  805
  806
  807
  808
  809
  810
  811
  812
  813
  814
  815
  816
  817
  818
  819
  820
  821
  822
  823
  824
  825
  826
  827
  828
  829
  830
  831
  832
  833
  834
  835
  836
  837
  838
  839
  840
  841
  842
  843
  844
  845
  846
  847
  848
  849
  850
  851
  852
  853
  854
  855
  856
  857
  858
  859
  860
  861
  862
  863
  864
  865
  866
  867
  868
  869
  870
  871
  872
  873
  874
  875
  876
  877
  878
  879
  880
  881
  882
  883
  884
  885
  886
  887
  888
  889
  890
  891
  892
  893
  894
  895
  896
  897
  898
  899
  900
  901
  902
  903
  904
  905
  906
  907
  908
  909
  910
  911
  912
  913
  914
  915
  916
  917
  918
  919
  920
  921
  922
  923
  924
  925
  926
  927
  928
  929
  930
  931
  932
  933
  934
  935
  936
  937
  938
  939
  940
  941
  942
  943
  944
  945
  946
  947
  948
  949
  950
  951
  952
  953
  954
  955
  956
  957
  958
  959
  960
  961
  962
  963
  964
  965
  966
  967
  968
  969
  970
  971
  972
  973
  974
  975
  976
  977
  978
  979
  980
  981
  982
  983
  984
  985
  986
  987
  988
  989
  990
  991
  992
  993
  994
  995
  996
  997
  998
  999
 1000
 1001
 1002
 1003
 1004
 1005
 1006
 1007
 1008
 1009
 1010
 1011
 1012
 1013
 1014
 1015
 1016
 1017
 1018
 1019
 1020
 1021
 1022
 1023
 1024
 1025
 1026
 1027
 1028
 1029
 1030
 1031
 1032
 1033
 1034
 1035
 1036
 1037
 1038
 1039
 1040
 1041
 1042
 1043
 1044
 1045
 1046
 1047
 1048
 1049
 1050
 1051
 1052
 1053
 1054
 1055
 1056
 1057
 1058
 1059
 1060
 1061
 1062
 1063
 1064
 1065
 1066
 1067
 1068
 1069
 1070
 1071
 1072
 1073
 1074
 1075
 1076
 1077
 1078
 1079
 1080
 1081
 1082
 1083
 1084
 1085
 1086
 1087
 1088
 1089
 1090
 1091
 1092
 1093
 1094
 1095
 1096
 1097
 1098
 1099
 1100
 1101
 1102
 1103
 1104
 1105
 1106
 1107
 1108
 1109
 1110
 1111
 1112
 1113
 1114
 1115
 1116
 1117
 1118
 1119
 1120
 1121
 1122
 1123
 1124
 1125
 1126
 1127
 1128
 1129
 1130
 1131
 1132
 1133
 1134
 1135
 1136
 1137
 1138
 1139
 1140
 1141
 1142
 1143
 1144
 1145
 1146
 1147
 1148
 1149
 1150
 1151
 1152
 1153
 1154
 1155
 1156
 1157
 1158
 1159
 1160
 1161
 1162
 1163
 1164
 1165
 1166
 1167
 1168
 1169
 1170
 1171
 1172
 1173
 1174
 1175
 1176
 1177
 1178
 1179
 1180
 1181
 1182
 1183
 1184
 1185
 1186
 1187
 1188
 1189
 1190
 1191
 1192
 1193
 1194
 1195
 1196
 1197
 1198
 1199
 1200
 1201
 1202
 1203
 1204
 1205
 1206
 1207
 1208
 1209
 1210
 1211
 1212
 1213
 1214
 1215
 1216
 1217
 1218
 1219
 1220
 1221
 1222
 1223
 1224
 1225
 1226
 1227
 1228
 1229
 1230
 1231
 1232
 1233
 1234
 1235
 1236
 1237
 1238
 1239
 1240
 1241
 1242
 1243
 1244
 1245
 1246
 1247
 1248
 1249
 1250
 1251
 1252
 1253
 1254
 1255
 1256
 1257
 1258
 1259
 1260
 1261
 1262
 1263
 1264
 1265
 1266
 1267
 1268
 1269
 1270
 1271
 1272
 1273
 1274
 1275
 1276
 1277
 1278
 1279
 1280
 1281
 1282
 1283
 1284
 1285
 1286
 1287
 1288
 1289
 1290
 1291
 1292
 1293
 1294
 1295
 1296
 1297
 1298
 1299
 1300
 1301
 1302
 1303
 1304
 1305
 1306
 1307
 1308
 1309
 1310
 1311
 1312
 1313
 1314
 1315
 1316
 1317
 1318
 1319
 1320
 1321
 1322
 1323
 1324
 1325
 1326
 1327
 1328
 1329
 1330
 1331
 1332
 1333
 1334
 1335
 1336
 1337
 1338
 1339
 1340
 1341
 1342
 1343
 1344
 1345
 1346
 1347
 1348
 1349
 1350
 1351
 1352
 1353
 1354
 1355
 1356
 1357
 1358
 1359
 1360
 1361
 1362
 1363
 1364
 1365
 1366
 1367
 1368
 1369
 1370
 1371
 1372
 1373
 1374
 1375
 1376
 1377
 1378
 1379
 1380
 1381
 1382
 1383
 1384
 1385
 1386
 1387
 1388
 1389
 1390
 1391
 1392
 1393
 1394
 1395
 1396
 1397
 1398
 1399
 1400
 1401
 1402
 1403
 1404
 1405
 1406
 1407
 1408
 1409
 1410
 1411
 1412
 1413
 1414
 1415
 1416
 1417
 1418
 1419
 1420
 1421
 1422
 1423
 1424
 1425
 1426
 1427
 1428
 1429
 1430
 1431
 1432
 1433
 1434
 1435
 1436
 1437
 1438
 1439
 1440
 1441
 1442
 1443
 1444
 1445
 1446
 1447
 1448
 1449
 1450
 1451
 1452
 1453
 1454
 1455
 1456
 1457
 1458
 1459
 1460
 1461
 1462
 1463
 1464
 1465
 1466
 1467
 1468
 1469
 1470
 1471
 1472
 1473
 1474
 1475
 1476
 1477
 1478
 1479
 1480
 1481
 1482
 1483
 1484
 1485
 1486
 1487
 1488
 1489
 1490
 1491
 1492
 1493
 1494
 1495
 1496
 1497
 1498
 1499
 1500
 1501
 1502
 1503
 1504
 1505
 1506
 1507
 1508
 1509
 1510
 1511
 1512
 1513
 1514
 1515
 1516
 1517
 1518
 1519
 1520
 1521
 1522
 1523
 1524
 1525
 1526
 1527
 1528
 1529
 1530
 1531
 1532
 1533
 1534
 1535
 1536
 1537
 1538
 1539
 1540
 1541
 1542
 1543
 1544
 1545
 1546
 1547
 1548
 1549
 1550
 1551
 1552
 1553
 1554
 1555
 1556
 1557
 1558
 1559
 1560
 1561
 1562
 1563
 1564
 1565
 1566
 1567
 1568
 1569
 1570
 1571
 1572
 1573
 1574
 1575
 1576
 1577
 1578
 1579
 1580
 1581
 1582
 1583
 1584
 1585
 1586
 1587
 1588
 1589
 1590
 1591
 1592
 1593
 1594
 1595
 1596
 1597
 1598
 1599
 1600
 1601
 1602
 1603
 1604
 1605
 1606
 1607
 1608
 1609
 1610
 1611
 1612
 1613
 1614
 1615
 1616
 1617
 1618
 1619
 1620
 1621
 1622
 1623
 1624
 1625
 1626
 1627
 1628
 1629
 1630
 1631
 1632
 1633
 1634
 1635
 1636
 1637
 1638
 1639
 1640
 1641
 1642
 1643
 1644
 1645
 1646
 1647
 1648
 1649
 1650
 1651
 1652
 1653
 1654
 1655
 1656
 1657
 1658
 1659
 1660
 1661
 1662
 1663
 1664
 1665
 1666
 1667
 1668
 1669
 1670
 1671
 1672
 1673
 1674
 1675
 1676
 1677
 1678
 1679
 1680
 1681
 1682
 1683
 1684
 1685
 1686
 1687
 1688
 1689
 1690
 1691
 1692
 1693
 1694
 1695
 1696
 1697
 1698
 1699
 1700
 1701
 1702
 1703
 1704
 1705
 1706
 1707
 1708
 1709
 1710
 1711
 1712
 1713
 1714
 1715
 1716
 1717
 1718
 1719
 1720
 1721
 1722
 1723
 1724
 1725
 1726
 1727
 1728
 1729
 1730
 1731
 1732
 1733
 1734
 1735
 1736
 1737
 1738
 1739
 1740
 1741
 1742
 1743
 1744
 1745
 1746
 1747
 1748
 1749
 1750
 1751
 1752
 1753
 1754
 1755
 1756
 1757
 1758
 1759
 1760
 1761
 1762
 1763
 1764
 1765
 1766
 1767
 1768
 1769
 1770
 1771
 1772
 1773
 1774
 1775
 1776
 1777
 1778
 1779
 1780
 1781
 1782
 1783
 1784
 1785
 1786
 1787
 1788
 1789
 1790
 1791
 1792
 1793
 1794
 1795
 1796
 1797
 1798
 1799
 1800
 1801
 1802
 1803
 1804
 1805
 1806
 1807
 1808
 1809
 1810
 1811
 1812
 1813
 1814
 1815
 1816
 1817
 1818
 1819
 1820
 1821
 1822
 1823
 1824
 1825
 1826
 1827
 1828
 1829
 1830
 1831
 1832
 1833
 1834
 1835
 1836
 1837
 1838
 1839
 1840
 1841
 1842
 1843
 1844
 1845
 1846
 1847
 1848
 1849
 1850
 1851
 1852
 1853
 1854
 1855
 1856
 1857
 1858
 1859
 1860
 1861
 1862
 1863
 1864
 1865
 1866
 1867
 1868
 1869
 1870
 1871
 1872
 1873
 1874
 1875
 1876
 1877
 1878
 1879
 1880
 1881
 1882
 1883
 1884
 1885
 1886
 1887
 1888
 1889
 1890
 1891
 1892
 1893
 1894
 1895
 1896
 1897
 1898
 1899
 1900
 1901
 1902
 1903
 1904
 1905
 1906
 1907
 1908
 1909
 1910
 1911
 1912
 1913
 1914
 1915
 1916
 1917
 1918
 1919
 1920
 1921
 1922
 1923
 1924
 1925
 1926
 1927
 1928
 1929
 1930
 1931
 1932
 1933
 1934
 1935
 1936
 1937
 1938
 1939
 1940
 1941
 1942
 1943
 1944
 1945
 1946
 1947
 1948
 1949
 1950
 1951
 1952
 1953
 1954
 1955
 1956
 1957
 1958
 1959
 1960
 1961
 1962
 1963
 1964
 1965
 1966
 1967
 1968
 1969
 1970
 1971
 1972
 1973
 1974
 1975
 1976
 1977
 1978
 1979
 1980
 1981
 1982
 1983
 1984
 1985
 1986
 1987
 1988
 1989
 1990
 1991
 1992
 1993
 1994
 1995
 1996
 1997
 1998
 1999
 2000
 2001
 2002
 2003
 2004
 2005
 2006
 2007
 2008
 2009
 2010
 2011
 2012
 2013
 2014
 2015
 2016
 2017
 2018
 2019
 2020
 2021
 2022
 2023
 2024
 2025
 2026
 2027
 2028
 2029
 2030
 2031
 2032
 2033
 2034
 2035
 2036
 2037
 2038
 2039
 2040
 2041
 2042
 2043
 2044
 2045
 2046
 2047
 2048
 2049
 2050
 2051
 2052
 2053
 2054
 2055
 2056
 2057
 2058
 2059
 2060
 2061
 2062
 2063
 2064
 2065
 2066
 2067
 2068
 2069
 2070
 2071
 2072
 2073
 2074
 2075
 2076
 2077
 2078
 2079
 2080
 2081
 2082
 2083
 2084
 2085
 2086
 2087
 2088
 2089
 2090
 2091
 2092
 2093
 2094
 2095
 2096
 2097
 2098
 2099
 2100
 2101
 2102
 2103
 2104
 2105
 2106
 2107
 2108
 2109
 2110
 2111
 2112
 2113
 2114
 2115
 2116
 2117
 2118
 2119
 2120
 2121
 2122
 2123
 2124
 2125
 2126
 2127
 2128
 2129
 2130
 2131
 2132
 2133
 2134
 2135
 2136
 2137
 2138
 2139
 2140
 2141
 2142
 2143
 2144
 2145
 2146
 2147
 2148
 2149
 2150
 2151
 2152
 2153
 2154
 2155
 2156
 2157
 2158
 2159
 2160
 2161
 2162
 2163
 2164
 2165
 2166
 2167
 2168
 2169
 2170
 2171
 2172
 2173
 2174
 2175
 2176
 2177
 2178
 2179
 2180
 2181
 2182
 2183
 2184
 2185
 2186
 2187
 2188
 2189
 2190
 2191
 2192
 2193
 2194
 2195
 2196
 2197
 2198
 2199
 2200
 2201
 2202
 2203
 2204
 2205
 2206
 2207
 2208
 2209
 2210
 2211
 2212
 2213
 2214
 2215
 2216
 2217
 2218
 2219
 2220
 2221
 2222
 2223
 2224
 2225
 2226
 2227
 2228
 2229
 2230
 2231
 2232
 2233
 2234
 2235
 2236
 2237
 2238
 2239
 2240
 2241
 2242
 2243
 2244
 2245
 2246
 2247
 2248
 2249
 2250
 2251
 2252
 2253
 2254
 2255
 2256
 2257
 2258
 2259
 2260
 2261
 2262
 2263
 2264
 2265
 2266
 2267
 2268
 2269
 2270
 2271
 2272
 2273
 2274
 2275
 2276
 2277
 2278
 2279
 2280
 2281
 2282
 2283
 2284
 2285
 2286
 2287
 2288
 2289
 2290
 2291
 2292
 2293
 2294
 2295
 2296
 2297
 2298
 2299
 2300
 2301
 2302
 2303
 2304
 2305
 2306
 2307
 2308
 2309
 2310
 2311
 2312
 2313
 2314
 2315
 2316
 2317
 2318
 2319
 2320
 2321
 2322
 2323
 2324
 2325
 2326
 2327
 2328
 2329
 2330
 2331
 2332
 2333
 2334
 2335
 2336
 2337
 2338
 2339
 2340
 2341
 2342
 2343
 2344
 2345
 2346
 2347
 2348
 2349
 2350
 2351
 2352
 2353
 2354
 2355
 2356
 2357
 2358
 2359
 2360
 2361
 2362
 2363
 2364
 2365
 2366
 2367
 2368
 2369
 2370
 2371
 2372
 2373
 2374
 2375
 2376
 2377
 2378
 2379
 2380
 2381
 2382
 2383
 2384
 2385
 2386
 2387
 2388
 2389
 2390
 2391
 2392
 2393
 2394
 2395
 2396
 2397
 2398
 2399
 2400
 2401
 2402
 2403
 2404
 2405
 2406
 2407
 2408
 2409
 2410
 2411
 2412
 2413
 2414
 2415
 2416
 2417
 2418
 2419
 2420
 2421
 2422
 2423
 2424
 2425
 2426
 2427
 2428
 2429
 2430
 2431
 2432
 2433
 2434
 2435
 2436
 2437
 2438
 2439
 2440
 2441
 2442
 2443
 2444
 2445
 2446
 2447
 2448
 2449
 2450
 2451
 2452
 2453
 2454
 2455
 2456
 2457
 2458
 2459
 2460
 2461
 2462
 2463
 2464
 2465
 2466
 2467
 2468
 2469
 2470
 2471
 2472
 2473
 2474
 2475
 2476
 2477
 2478
 2479
 2480
 2481
 2482
 2483
 2484
 2485
 2486
 2487
 2488
 2489
 2490
 2491
 2492
 2493
 2494
 2495
 2496
 2497
 2498
 2499
 2500
 2501
 2502
 2503
 2504
 2505
 2506
 2507
 2508
 2509
 2510
 2511
 2512
 2513
 2514
 2515
 2516
 2517
 2518
 2519
 2520
 2521
 2522
 2523
 2524
 2525
 2526
 2527
 2528
 2529
 2530
 2531
 2532
 2533
 2534
 2535
 2536
 2537
 2538
 2539
 2540
 2541
 2542
 2543
 2544
 2545
 2546
 2547
 2548
 2549
 2550
 2551
 2552
 2553
 2554
 2555
 2556
 2557
 2558
 2559
 2560
 2561
 2562
 2563
 2564
 2565
 2566
 2567
 2568
 2569
 2570
 2571
 2572
 2573
 2574
 2575
 2576
 2577
 2578
 2579
 2580
 2581
 2582
 2583
 2584
 2585
 2586
 2587
 2588
 2589
 2590
 2591
 2592
 2593
 2594
 2595
 2596
 2597
 2598
 2599
 2600
 2601
 2602
 2603
 2604
 2605
 2606
 2607
 2608
 2609
 2610
 2611
 2612
 2613
 2614
 2615
 2616
 2617
 2618
 2619
 2620
 2621
 2622
 2623
 2624
 2625
 2626
 2627
 2628
 2629
 2630
 2631
 2632
 2633
 2634
 2635
 2636
 2637
 2638
 2639
 2640
 2641
 2642
 2643
 2644
 2645
 2646
 2647
 2648
 2649
 2650
 2651
 2652
 2653
 2654
 2655
 2656
 2657
 2658
 2659
 2660
 2661
 2662
 2663
 2664
 2665
 2666
 2667
 2668
 2669
 2670
 2671
 2672
 2673
 2674
 2675
 2676
 2677
 2678
 2679
 2680
 2681
 2682
 2683
 2684
 2685
 2686
 2687
 2688
 2689
 2690
 2691
 2692
 2693
 2694
 2695
 2696
 2697
 2698
 2699
 2700
 2701
 2702
 2703
 2704
 2705
 2706
 2707
 2708
 2709
 2710
 2711
 2712
 2713
 2714
 2715
 2716
 2717
 2718
 2719
 2720
 2721
 2722
 2723
 2724
 2725
 2726
 2727
 2728
 2729
 2730
 2731
 2732
 2733
 2734
 2735
 2736
 2737
 2738
 2739
 2740
 2741
 2742
 2743
 2744
 2745
 2746
 2747
 2748
 2749
 2750
 2751
 2752
 2753
 2754
 2755
 2756
 2757
 2758
 2759
 2760
 2761
 2762
 2763
 2764
 2765
 2766
 2767
 2768
 2769
 2770
 2771
 2772
 2773
 2774
 2775
 2776
 2777
 2778
 2779
 2780
 2781
 2782
 2783
 2784
 2785
 2786
 2787
 2788
 2789
 2790
 2791
 2792
 2793
 2794
 2795
 2796
 2797
 2798
 2799
 2800
 2801
 2802
 2803
 2804
 2805
 2806
 2807
 2808
 2809
 2810
 2811
 2812
 2813
 2814
 2815
 2816
 2817
 2818
 2819
 2820
 2821
 2822
 2823
 2824
 2825
 2826
 2827
 2828
 2829
 2830
 2831
 2832
 2833
 2834
 2835
 2836
 2837
 2838
 2839
 2840
 2841
 2842
 2843
 2844
 2845
 2846
 2847
 2848
 2849
 2850
 2851
 2852
 2853
 2854
 2855
 2856
 2857
 2858
 2859
 2860
 2861
 2862
 2863
 2864
 2865
 2866
 2867
 2868
 2869
 2870
 2871
 2872
 2873
 2874
 2875
 2876
 2877
 2878
 2879
 2880
 2881
 2882
 2883
 2884
 2885
 2886
 2887
 2888
 2889
 2890
 2891
 2892
 2893
 2894
 2895
 2896
 2897
 2898
 2899
 2900
 2901
 2902
 2903
 2904
 2905
 2906
 2907
 2908
 2909
 2910
 2911
 2912
 2913
 2914
 2915
 2916
 2917
 2918
 2919
 2920
 2921
 2922
 2923
 2924
 2925
 2926
 2927
 2928
 2929
 2930
 2931
 2932
 2933
 2934
 2935
 2936
 2937
 2938
 2939
 2940
 2941
 2942
 2943
 2944
 2945
 2946
 2947
 2948
 2949
 2950
 2951
 2952
 2953
 2954
 2955
 2956
 2957
 2958
 2959
 2960
 2961
 2962
 2963
 2964
 2965
 2966
 2967
 2968
 2969
 2970
 2971
 2972
 2973
 2974
 2975
 2976
 2977
 2978
 2979
 2980
 2981
 2982
 2983
 2984
 2985
 2986
 2987
 2988
 2989
 2990
 2991
 2992
 2993
 2994
 2995
 2996
 2997
 2998
 2999
 3000
 3001
 3002
 3003
 3004
 3005
 3006
 3007
 3008
 3009
 3010
 3011
 3012
 3013
 3014
 3015
 3016
 3017
 3018
 3019
 3020
 3021
 3022
 3023
 3024
 3025
 3026
 3027
 3028
 3029
 3030
 3031
 3032
 3033
 3034
 3035
 3036
 3037
 3038
 3039
 3040
 3041
 3042
 3043
 3044
 3045
 3046
 3047
 3048
 3049
 3050
 3051
 3052
 3053
 3054
 3055
 3056
 3057
 3058
 3059
 3060
 3061
 3062
 3063
 3064
 3065
 3066
 3067
 3068
 3069
 3070
 3071
 3072
 3073
 3074
 3075
 3076
 3077
 3078
 3079
 3080
 3081
 3082
 3083
 3084
 3085
 3086
 3087
 3088
 3089
 3090
 3091
 3092
 3093
 3094
 3095
 3096
 3097
 3098
 3099
 3100
 3101
 3102
 3103
 3104
 3105
 3106
 3107
 3108
 3109
 3110
 3111
 3112
 3113
 3114
 3115
 3116
 3117
 3118
 3119
 3120
 3121
 3122
 3123
 3124
 3125
 3126
 3127
 3128
 3129
 3130
 3131
 3132
 3133
 3134
 3135
 3136
 3137
 3138
 3139
 3140
 3141
 3142
 3143
 3144
 3145
 3146
 3147
 3148
 3149
 3150
 3151
 3152
 3153
 3154
 3155
 3156
 3157
 3158
 3159
 3160
 3161
 3162
 3163
 3164
 3165
 3166
 3167
 3168
 3169
 3170
 3171
 3172
 3173
 3174
 3175
 3176
 3177
 3178
 3179
 3180
 3181
 3182
 3183
 3184
 3185
 3186
 3187
 3188
 3189
 3190
 3191
 3192
 3193
 3194
 3195
 3196
 3197
 3198
 3199
 3200
 3201
 3202
 3203
 3204
 3205
 3206
 3207
 3208
 3209
 3210
 3211
 3212
 3213
 3214
 3215
 3216
 3217
 3218
 3219
 3220
 3221
 3222
 3223
 3224
 3225
 3226
 3227
 3228
 3229
 3230
 3231
 3232
 3233
 3234
 3235
 3236
 3237
 3238
 3239
 3240
 3241
 3242
 3243
 3244
 3245
 3246
 3247
 3248
 3249
 3250
 3251
 3252
 3253
 3254
 3255
 3256
 3257
 3258
 3259
 3260
 3261
 3262
 3263
 3264
 3265
 3266
 3267
 3268
 3269
 3270
 3271
 3272
 3273
 3274
 3275
 3276
 3277
 3278
 3279
 3280
 3281
 3282
 3283
 3284
 3285
 3286
 3287
 3288
 3289
 3290
 3291
 3292
 3293
 3294
 3295
 3296
 3297
 3298
 3299
 3300
 3301
 3302
 3303
 3304
 3305
 3306
 3307
 3308
 3309
 3310
 3311
 3312
 3313
 3314
 3315
 3316
 3317
 3318
 3319
 3320
 3321
 3322
 3323
 3324
 3325
 3326
 3327
 3328
 3329
 3330
 3331
 3332
 3333
 3334
 3335
 3336
 3337
 3338
 3339
 3340
 3341
 3342
 3343
 3344
 3345
 3346
 3347
 3348
 3349
 3350
 3351
 3352
 3353
 3354
 3355
 3356
 3357
 3358
 3359
 3360
 3361
 3362
 3363
 3364
 3365
 3366
 3367
 3368
 3369
 3370
 3371
 3372
 3373
 3374
 3375
 3376
 3377
 3378
 3379
 3380
 3381
 3382
 3383
 3384
 3385
 3386
 3387
 3388
 3389
 3390
 3391
 3392
 3393
 3394
 3395
 3396
 3397
 3398
 3399
 3400
 3401
 3402
 3403
 3404
 3405
 3406
 3407
 3408
 3409
 3410
 3411
 3412
 3413
 3414
 3415
 3416
 3417
 3418
 3419
 3420
 3421
 3422
 3423
 3424
 3425
 3426
 3427
 3428
 3429
 3430
 3431
 3432
 3433
 3434
 3435
 3436
 3437
 3438
 3439
 3440
 3441
 3442
 3443
 3444
 3445
 3446
 3447
 3448
 3449
 3450
 3451
 3452
 3453
 3454
 3455
 3456
 3457
 3458
 3459
 3460
 3461
 3462
 3463
 3464
 3465
 3466
 3467
 3468
 3469
 3470
 3471
 3472
 3473
 3474
 3475
 3476
 3477
 3478
 3479
 3480
 3481
 3482
 3483
 3484
 3485
 3486
 3487
 3488
 3489
 3490
 3491
 3492
 3493
 3494
 3495
 3496
 3497
 3498
 3499
 3500
 3501
 3502
 3503
 3504
 3505
 3506
 3507
 3508
 3509
 3510
 3511
 3512
 3513
 3514
 3515
 3516
 3517
 3518
 3519
 3520
 3521
 3522
 3523
 3524
 3525
 3526
 3527
 3528
 3529
 3530
 3531
 3532
 3533
 3534
 3535
 3536
 3537
 3538
 3539
 3540
 3541
 3542
 3543
 3544
 3545
 3546
 3547
 3548
 3549
 3550
 3551
 3552
 3553
 3554
 3555
 3556
 3557
 3558
 3559
 3560
 3561
 3562
 3563
 3564
 3565
 3566
 3567
 3568
 3569
 3570
 3571
 3572
 3573
 3574
 3575
 3576
 3577
 3578
 3579
 3580
 3581
 3582
 3583
 3584
 3585
 3586
 3587
 3588
 3589
 3590
 3591
 3592
 3593
 3594
 3595
 3596
 3597
 3598
 3599
 3600
 3601
 3602
 3603
 3604
 3605
 3606
 3607
 3608
 3609
 3610
 3611
 3612
 3613
 3614
 3615
 3616
 3617
 3618
 3619
 3620
 3621
 3622
 3623
 3624
 3625
 3626
 3627
 3628
 3629
 3630
 3631
 3632
 3633
 3634
 3635
 3636
 3637
 3638
 3639
 3640
 3641
 3642
 3643
 3644
 3645
 3646
 3647
 3648
 3649
 3650
 3651
 3652
 3653
 3654
 3655
 3656
 3657
 3658
 3659
 3660
 3661
 3662
 3663
 3664
 3665
 3666
 3667
 3668
 3669
 3670
 3671
 3672
 3673
 3674
 3675
 3676
 3677
 3678
 3679
 3680
 3681
 3682
 3683
 3684
 3685
 3686
 3687
 3688
 3689
 3690
 3691
 3692
 3693
 3694
 3695
 3696
 3697
 3698
 3699
 3700
 3701
 3702
 3703
 3704
 3705
 3706
 3707
 3708
 3709
 3710
 3711
 3712
 3713
 3714
 3715
 3716
 3717
 3718
 3719
 3720
 3721
 3722
 3723
 3724
 3725
 3726
 3727
 3728
 3729
 3730
 3731
 3732
 3733
 3734
 3735
 3736
 3737
 3738
 3739
 3740
 3741
 3742
 3743
 3744
 3745
 3746
 3747
 3748
 3749
 3750
 3751
 3752
 3753
 3754
 3755
 3756
 3757
 3758
 3759
 3760
 3761
 3762
 3763
 3764
 3765
 3766
 3767
 3768
 3769
 3770
 3771
 3772
 3773
 3774
 3775
 3776
 3777
 3778
 3779
 3780
 3781
 3782
 3783
 3784
 3785
 3786
 3787
 3788
 3789
 3790
 3791
 3792
 3793
 3794
 3795
 3796
 3797
 3798
 3799
 3800
 3801
 3802
 3803
 3804
 3805
 3806
 3807
 3808
 3809
 3810
 3811
 3812
 3813
 3814
 3815
 3816
 3817
 3818
 3819
 3820
 3821
 3822
 3823
 3824
 3825
 3826
 3827
 3828
 3829
 3830
 3831
 3832
 3833
 3834
 3835
 3836
 3837
 3838
 3839
 3840
 3841
 3842
 3843
 3844
 3845
 3846
 3847
 3848
 3849
 3850
 3851
 3852
 3853
 3854
 3855
 3856
 3857
 3858
 3859
 3860
 3861
 3862
 3863
 3864
 3865
 3866
 3867
 3868
 3869
 3870
 3871
 3872
 3873
 3874
 3875
 3876
 3877
 3878
 3879
 3880
 3881
 3882
 3883
 3884
 3885
 3886
 3887
 3888
 3889
 3890
 3891
 3892
 3893
 3894
 3895
 3896
 3897
 3898
 3899
 3900
 3901
 3902
 3903
 3904
 3905
 3906
 3907
 3908
 3909
 3910
 3911
 3912
 3913
 3914
 3915
 3916
 3917
 3918
 3919
 3920
 3921
 3922
 3923
 3924
 3925
 3926
 3927
 3928
 3929
 3930
 3931
 3932
 3933
 3934
 3935
 3936
 3937
 3938
 3939
 3940
 3941
 3942
 3943
 3944
 3945
 3946
 3947
 3948
 3949
 3950
 3951
 3952
 3953
 3954
 3955
 3956
 3957
 3958
 3959
 3960
 3961
 3962
 3963
 3964
 3965
 3966
 3967
 3968
 3969
 3970
 3971
 3972
 3973
 3974
 3975
 3976
 3977
 3978
 3979
 3980
 3981
 3982
 3983
 3984
 3985
 3986
 3987
 3988
 3989
 3990
 3991
 3992
 3993
 3994
 3995
 3996
 3997
 3998
 3999
 4000
 4001
 4002
 4003
 4004
 4005
 4006
 4007
 4008
 4009
 4010
 4011
 4012
 4013
 4014
 4015
 4016
 4017
 4018
 4019
 4020
 4021
 4022
 4023
 4024
 4025
 4026
 4027
 4028
 4029
 4030
 4031
 4032
 4033
 4034
 4035
 4036
 4037
 4038
 4039
 4040
 4041
 4042
 4043
 4044
 4045
 4046
 4047
 4048
 4049
 4050
 4051
 4052
 4053
 4054
 4055
 4056
 4057
 4058
 4059
 4060
 4061
 4062
 4063
 4064
 4065
 4066
 4067
 4068
 4069
 4070
 4071
 4072
 4073
 4074
 4075
 4076
 4077
 4078
 4079
 4080
 4081
 4082
 4083
 4084
 4085
 4086
 4087
 4088
 4089
 4090
 4091
 4092
 4093
 4094
 4095
 4096
 4097
 4098
 4099
 4100
 4101
 4102
 4103
 4104
 4105
 4106
 4107
 4108
 4109
 4110
 4111
 4112
 4113
 4114
 4115
 4116
 4117
 4118
 4119
 4120
 4121
 4122
 4123
 4124
 4125
 4126
 4127
 4128
 4129
 4130
 4131
 4132
 4133
 4134
 4135
 4136
 4137
 4138
 4139
 4140
 4141
 4142
 4143
 4144
 4145
 4146
 4147
 4148
 4149
 4150
 4151
 4152
 4153
 4154
 4155
 4156
 4157
 4158
 4159
 4160
 4161
 4162
 4163
 4164
 4165
 4166
 4167
 4168
 4169
 4170
 4171
 4172
 4173
 4174
 4175
 4176
 4177
 4178
 4179
 4180
 4181
 4182
 4183
 4184
 4185
 4186
 4187
 4188
 4189
 4190
 4191
 4192
 4193
 4194
 4195
 4196
 4197
 4198
 4199
 4200
 4201
 4202
 4203
 4204
 4205
 4206
 4207
 4208
 4209
 4210
 4211
 4212
 4213
 4214
 4215
 4216
 4217
 4218
 4219
 4220
 4221
 4222
 4223
 4224
 4225
 4226
 4227
 4228
 4229
 4230
 4231
 4232
 4233
 4234
 4235
 4236
 4237
 4238
 4239
 4240
 4241
 4242
 4243
 4244
 4245
 4246
 4247
 4248
 4249
 4250
 4251
 4252
 4253
 4254
 4255
 4256
 4257
 4258
 4259
 4260
 4261
 4262
 4263
 4264
 4265
 4266
 4267
 4268
 4269
 4270
 4271
 4272
 4273
 4274
 4275
 4276
 4277
 4278
 4279
 4280
 4281
 4282
 4283
 4284
 4285
 4286
 4287
 4288
 4289
 4290
 4291
 4292
 4293
 4294
 4295
 4296
 4297
 4298
 4299
 4300
 4301
 4302
 4303
 4304
 4305
 4306
 4307
 4308
 4309
 4310
 4311
 4312
 4313
 4314
 4315
 4316
 4317
 4318
 4319
 4320
 4321
 4322
 4323
 4324
 4325
 4326
 4327
 4328
 4329
 4330
 4331
 4332
 4333
 4334
 4335
 4336
 4337
 4338
 4339
 4340
 4341
 4342
 4343
 4344
 4345
 4346
 4347
 4348
 4349
 4350
 4351
 4352
 4353
 4354
 4355
 4356
 4357
 4358
 4359
 4360
 4361
 4362
 4363
 4364
 4365
 4366
 4367
 4368
 4369
 4370
 4371
 4372
 4373
 4374
 4375
 4376
 4377
 4378
 4379
 4380
 4381
 4382
 4383
 4384
 4385
 4386
 4387
 4388
 4389
 4390
 4391
 4392
 4393
 4394
 4395
 4396
 4397
 4398
 4399
 4400
 4401
 4402
 4403
 4404
 4405
 4406
 4407
 4408
 4409
 4410
 4411
 4412
 4413
 4414
 4415
 4416
 4417
 4418
 4419
 4420
 4421
 4422
 4423
 4424
 4425
 4426
 4427
 4428
 4429
 4430
 4431
 4432
 4433
 4434
 4435
 4436
 4437
 4438
 4439
 4440
 4441
 4442
 4443
 4444
 4445
 4446
 4447
 4448
 4449
 4450
 4451
 4452
 4453
 4454
 4455
 4456
 4457
 4458
 4459
 4460
 4461
 4462
 4463
 4464
 4465
 4466
 4467
 4468
 4469
 4470
 4471
 4472
 4473
 4474
 4475
 4476
 4477
 4478
 4479
 4480
 4481
 4482
 4483
 4484
 4485
 4486
 4487
 4488
 4489
 4490
 4491
 4492
 4493
 4494
 4495
 4496
 4497
 4498
 4499
 4500
 4501
 4502
 4503
 4504
 4505
 4506
 4507
 4508
 4509
 4510
 4511
 4512
 4513
 4514
 4515
 4516
 4517
 4518
 4519
 4520
 4521
 4522
 4523
 4524
 4525
 4526
 4527
 4528
 4529
 4530
 4531
 4532
 4533
 4534
 4535
 4536
 4537
 4538
 4539
 4540
 4541
 4542
 4543
 4544
 4545
 4546
 4547
 4548
 4549
 4550
 4551
 4552
 4553
 4554
 4555
 4556
 4557
 4558
 4559
 4560
 4561
 4562
 4563
 4564
 4565
 4566
 4567
 4568
 4569
 4570
 4571
 4572
 4573
 4574
 4575
 4576
 4577
 4578
 4579
 4580
 4581
 4582
 4583
 4584
 4585
 4586
 4587
 4588
 4589
 4590
 4591
 4592
 4593
 4594
 4595
 4596
 4597
 4598
 4599
 4600
 4601
 4602
 4603
 4604
 4605
 4606
 4607
 4608
 4609
 4610
 4611
 4612
 4613
 4614
 4615
 4616
 4617
 4618
 4619
 4620
 4621
 4622
 4623
 4624
 4625
 4626
 4627
 4628
 4629
 4630
 4631
 4632
 4633
 4634
 4635
 4636
 4637
 4638
 4639
 4640
 4641
 4642
 4643
 4644
 4645
 4646
 4647
 4648
 4649
 4650
 4651
 4652
 4653
 4654
 4655
 4656
 4657
 4658
 4659
 4660
 4661
 4662
 4663
 4664
 4665
 4666
 4667
 4668
 4669
 4670
 4671
 4672
 4673
 4674
 4675
 4676
 4677
 4678
 4679
 4680
 4681
 4682
 4683
 4684
 4685
 4686
 4687
 4688
 4689
 4690
 4691
 4692
 4693
 4694
 4695
 4696
 4697
 4698
 4699
 4700
 4701
 4702
 4703
 4704
 4705
 4706
 4707
 4708
 4709
 4710
 4711
 4712
 4713
 4714
 4715
 4716
 4717
 4718
 4719
 4720
 4721
 4722
 4723
 4724
 4725
 4726
 4727
 4728
 4729
 4730
 4731
 4732
 4733
 4734
 4735
 4736
 4737
 4738
 4739
 4740
 4741
 4742
 4743
 4744
 4745
 4746
 4747
 4748
 4749
 4750
 4751
 4752
 4753
 4754
 4755
 4756
 4757
 4758
 4759
 4760
 4761
 4762
 4763
 4764
 4765
 4766
 4767
 4768
 4769
 4770
 4771
 4772
 4773
 4774
 4775
 4776
 4777
 4778
 4779
 4780
 4781
 4782
 4783
 4784
 4785
 4786
 4787
 4788
 4789
 4790
 4791
 4792
 4793
 4794
 4795
 4796
 4797
 4798
 4799
 4800
 4801
 4802
 4803
 4804
 4805
 4806
 4807
 4808
 4809
 4810
 4811
 4812
 4813
 4814
 4815
 4816
 4817
 4818
 4819
 4820
 4821
 4822
 4823
 4824
 4825
 4826
 4827
 4828
 4829
 4830
 4831
 4832
 4833
 4834
 4835
 4836
 4837
 4838
 4839
 4840
 4841
 4842
 4843
 4844
 4845
 4846
 4847
 4848
 4849
 4850
 4851
 4852
 4853
 4854
 4855
 4856
 4857
 4858
 4859
 4860
 4861
 4862
 4863
 4864
 4865
 4866
 4867
 4868
 4869
 4870
 4871
 4872
 4873
 4874
 4875
 4876
 4877
 4878
 4879
 4880
 4881
 4882
 4883
 4884
 4885
 4886
 4887
 4888
 4889
 4890
 4891
 4892
 4893
 4894
 4895
 4896
 4897
 4898
 4899
 4900
 4901
 4902
 4903
 4904
 4905
 4906
 4907
 4908
 4909
 4910
 4911
 4912
 4913
 4914
 4915
 4916
 4917
 4918
 4919
 4920
 4921
 4922
 4923
 4924
 4925
 4926
 4927
 4928
 4929
 4930
 4931
 4932
 4933
 4934
 4935
 4936
 4937
 4938
 4939
 4940
 4941
 4942
 4943
 4944
 4945
 4946
 4947
 4948
 4949
 4950
 4951
 4952
 4953
 4954
 4955
 4956
 4957
 4958
 4959
 4960
 4961
 4962
 4963
 4964
 4965
 4966
 4967
 4968
 4969
 4970
 4971
 4972
 4973
 4974
 4975
 4976
 4977
 4978
 4979
 4980
 4981
 4982
 4983
 4984
 4985
 4986
 4987
 4988
 4989
 4990
 4991
 4992
 4993
 4994
 4995
 4996
 4997
 4998
 4999
 5000
 5001
 5002
 5003
 5004
 5005
 5006
 5007
 5008
 5009
 5010
 5011
 5012
 5013
 5014
 5015
 5016
 5017
 5018
 5019
 5020
 5021
 5022
 5023
 5024
 5025
 5026
 5027
 5028
 5029
 5030
 5031
 5032
 5033
 5034
 5035
 5036
 5037
 5038
 5039
 5040
 5041
 5042
 5043
 5044
 5045
 5046
 5047
 5048
 5049
 5050
 5051
 5052
 5053
 5054
 5055
 5056
 5057
 5058
 5059
 5060
 5061
 5062
 5063
 5064
 5065
 5066
 5067
 5068
 5069
 5070
 5071
 5072
 5073
 5074
 5075
 5076
 5077
 5078
 5079
 5080
 5081
 5082
 5083
 5084
 5085
 5086
 5087
 5088
 5089
 5090
 5091
 5092
 5093
 5094
 5095
 5096
 5097
 5098
 5099
 5100
 5101
 5102
 5103
 5104
 5105
 5106
 5107
 5108
 5109
 5110
 5111
 5112
 5113
 5114
 5115
 5116
 5117
 5118
 5119
 5120
 5121
 5122
 5123
 5124
 5125
 5126
 5127
 5128
 5129
 5130
 5131
 5132
 5133
 5134
 5135
 5136
 5137
 5138
 5139
 5140
 5141
 5142
 5143
 5144
 5145
 5146
 5147
 5148
 5149
 5150
 5151
 5152
 5153
 5154
 5155
 5156
 5157
 5158
 5159
 5160
 5161
 5162
 5163
 5164
 5165
 5166
 5167
 5168
 5169
 5170
 5171
 5172
 5173
 5174
 5175
 5176
 5177
 5178
 5179
 5180
 5181
 5182
 5183
 5184
 5185
 5186
 5187
 5188
 5189
 5190
 5191
 5192
 5193
 5194
 5195
 5196
 5197
 5198
 5199
 5200
 5201
 5202
 5203
 5204
 5205
 5206
 5207
 5208
 5209
 5210
 5211
 5212
 5213
 5214
 5215
 5216
 5217
 5218
 5219
 5220
 5221
 5222
 5223
 5224
 5225
 5226
 5227
 5228
 5229
 5230
 5231
 5232
 5233
 5234
 5235
 5236
 5237
 5238
 5239
 5240
 5241
 5242
 5243
 5244
 5245
 5246
 5247
 5248
 5249
 5250
 5251
 5252
 5253
 5254
 5255
 5256
 5257
 5258
 5259
 5260
 5261
 5262
 5263
 5264
 5265
 5266
 5267
 5268
 5269
 5270
 5271
 5272
 5273
 5274
 5275
 5276
 5277
 5278
 5279
 5280
 5281
 5282
 5283
 5284
 5285
 5286
 5287
 5288
 5289
 5290
 5291
 5292
 5293
 5294
 5295
 5296
 5297
 5298
 5299
 5300
 5301
 5302
 5303
 5304
 5305
 5306
 5307
 5308
 5309
 5310
 5311
 5312
 5313
 5314
 5315
 5316
 5317
 5318
 5319
 5320
 5321
 5322
 5323
 5324
 5325
 5326
 5327
 5328
 5329
 5330
 5331
 5332
 5333
 5334
 5335
 5336
 5337
 5338
 5339
 5340
 5341
 5342
 5343
 5344
 5345
 5346
 5347
 5348
 5349
 5350
 5351
 5352
 5353
 5354
 5355
 5356
 5357
 5358
 5359
 5360
 5361
 5362
 5363
 5364
 5365
 5366
 5367
 5368
 5369
 5370
 5371
 5372
 5373
 5374
 5375
 5376
 5377
 5378
 5379
 5380
 5381
 5382
 5383
 5384
 5385
 5386
 5387
 5388
 5389
 5390
 5391
 5392
 5393
 5394
 5395
 5396
 5397
 5398
 5399
 5400
 5401
 5402
 5403
 5404
 5405
 5406
 5407
 5408
 5409
 5410
 5411
 5412
 5413
 5414
 5415
 5416
 5417
 5418
 5419
 5420
 5421
 5422
 5423
 5424
 5425
 5426
 5427
 5428
 5429
 5430
 5431
 5432
 5433
 5434
 5435
 5436
 5437
 5438
 5439
 5440
 5441
 5442
 5443
 5444
 5445
 5446
 5447
 5448
 5449
 5450
 5451
 5452
 5453
 5454
 5455
 5456
 5457
 5458
 5459
 5460
 5461
 5462
 5463
 5464
 5465
 5466
 5467
 5468
 5469
 5470
 5471
 5472
 5473
 5474
 5475
 5476
 5477
 5478
 5479
 5480
 5481
 5482
 5483
 5484
 5485
 5486
 5487
 5488
 5489
 5490
 5491
 5492
 5493
 5494
 5495
 5496
 5497
 5498
 5499
 5500
 5501
 5502
 5503
 5504
 5505
 5506
 5507
 5508
 5509
 5510
 5511
 5512
 5513
 5514
 5515
 5516
 5517
 5518
 5519
 5520
 5521
 5522
 5523
 5524
 5525
 5526
 5527
 5528
 5529
 5530
 5531
 5532
 5533
 5534
 5535
 5536
 5537
 5538
 5539
 5540
 5541
 5542
 5543
 5544
 5545
 5546
 5547
 5548
 5549
 5550
 5551
 5552
 5553
 5554
 5555
 5556
 5557
 5558
 5559
 5560
 5561
 5562
 5563
 5564
 5565
 5566
 5567
 5568
 5569
 5570
 5571
 5572
 5573
 5574
 5575
 5576
 5577
 5578
 5579
 5580
 5581
 5582
 5583
 5584
 5585
 5586
 5587
 5588
 5589
 5590
 5591
 5592
 5593
 5594
 5595
 5596
 5597
 5598
 5599
 5600
 5601
 5602
 5603
 5604
 5605
 5606
 5607
 5608
 5609
 5610
 5611
 5612
 5613
 5614
 5615
 5616
 5617
 5618
 5619
 5620
 5621
 5622
 5623
 5624
 5625
 5626
 5627
 5628
 5629
 5630
 5631
 5632
 5633
 5634
 5635
 5636
 5637
 5638
 5639
 5640
 5641
 5642
 5643
 5644
 5645
 5646
 5647
 5648
 5649
 5650
 5651
 5652
 5653
 5654
 5655
 5656
 5657
 5658
 5659
 5660
 5661
 5662
 5663
 5664
 5665
 5666
 5667
 5668
 5669
 5670
 5671
 5672
 5673
 5674
 5675
 5676
 5677
 5678
 5679
 5680
 5681
 5682
 5683
 5684
 5685
 5686
 5687
 5688
 5689
 5690
 5691
 5692
 5693
 5694
 5695
 5696
 5697
 5698
 5699
 5700
 5701
 5702
 5703
 5704
 5705
 5706
 5707
 5708
 5709
 5710
 5711
 5712
 5713
 5714
 5715
 5716
 5717
 5718
 5719
 5720
 5721
 5722
 5723
 5724
 5725
 5726
 5727
 5728
 5729
 5730
 5731
 5732
 5733
 5734
 5735
 5736
 5737
 5738
 5739
 5740
 5741
 5742
 5743
 5744
 5745
 5746
 5747
 5748
 5749
 5750
 5751
 5752
 5753
 5754
 5755
 5756
 5757
 5758
 5759
 5760
 5761
 5762
 5763
 5764
 5765
 5766
 5767
 5768
 5769
 5770
 5771
 5772
 5773
 5774
 5775
 5776
 5777
 5778
 5779
 5780
 5781
 5782
 5783
 5784
 5785
 5786
 5787
 5788
 5789
 5790
 5791
 5792
 5793
 5794
 5795
 5796
 5797
 5798
 5799
 5800
 5801
 5802
 5803
 5804
 5805
 5806
 5807
 5808
 5809
 5810
 5811
 5812
 5813
 5814
 5815
 5816
 5817
 5818
 5819
 5820
 5821
 5822
 5823
 5824
 5825
 5826
 5827
 5828
 5829
 5830
 5831
 5832
 5833
 5834
 5835
 5836
 5837
 5838
 5839
 5840
 5841
 5842
 5843
 5844
 5845
 5846
 5847
 5848
 5849
 5850
 5851
 5852
 5853
 5854
 5855
 5856
 5857
 5858
 5859
 5860
 5861
 5862
 5863
 5864
 5865
 5866
 5867
 5868
 5869
 5870
 5871
 5872
 5873
 5874
 5875
 5876
 5877
 5878
 5879
 5880
 5881
 5882
 5883
 5884
 5885
 5886
 5887
 5888
 5889
 5890
 5891
 5892
 5893
 5894
 5895
 5896
 5897
 5898
 5899
 5900
 5901
 5902
 5903
 5904
 5905
 5906
 5907
 5908
 5909
 5910
 5911
 5912
 5913
 5914
 5915
 5916
 5917
 5918
 5919
 5920
 5921
 5922
 5923
 5924
 5925
 5926
 5927
 5928
 5929
 5930
 5931
 5932
 5933
 5934
 5935
 5936
 5937
 5938
 5939
 5940
 5941
 5942
 5943
 5944
 5945
 5946
 5947
 5948
 5949
 5950
 5951
 5952
 5953
 5954
 5955
 5956
 5957
 5958
 5959
 5960
 5961
 5962
 5963
 5964
 5965
 5966
 5967
 5968
 5969
 5970
 5971
 5972
 5973
 5974
 5975
 5976
 5977
 5978
 5979
 5980
 5981
 5982
 5983
 5984
 5985
 5986
 5987
 5988
 5989
 5990
 5991
 5992
 5993
 5994
 5995
 5996
 5997
 5998
 5999
 6000
 6001
 6002
 6003
 6004
 6005
 6006
 6007
 6008
 6009
 6010
 6011
 6012
 6013
 6014
 6015
 6016
 6017
 6018
 6019
 6020
 6021
 6022
 6023
 6024
 6025
 6026
 6027
 6028
 6029
 6030
 6031
 6032
 6033
 6034
 6035
 6036
 6037
 6038
 6039
 6040
 6041
 6042
 6043
 6044
 6045
 6046
 6047
 6048
 6049
 6050
 6051
 6052
 6053
 6054
 6055
 6056
 6057
 6058
 6059
 6060
 6061
 6062
 6063
 6064
 6065
 6066
 6067
 6068
 6069
 6070
 6071
 6072
 6073
 6074
 6075
 6076
 6077
 6078
 6079
 6080
 6081
 6082
 6083
 6084
 6085
 6086
 6087
 6088
 6089
 6090
 6091
 6092
 6093
 6094
 6095
 6096
 6097
 6098
 6099
 6100
 6101
 6102
 6103
 6104
 6105
 6106
 6107
 6108
 6109
 6110
 6111
 6112
 6113
 6114
 6115
 6116
 6117
 6118
 6119
 6120
 6121
 6122
 6123
 6124
 6125
 6126
 6127
 6128
 6129
 6130
 6131
 6132
 6133
 6134
 6135
 6136
 6137
 6138
 6139
 6140
 6141
 6142
 6143
 6144
 6145
 6146
 6147
 6148
 6149
 6150
 6151
 6152
 6153
 6154
 6155
 6156
 6157
 6158
 6159
 6160
 6161
 6162
 6163
 6164
 6165
 6166
 6167
 6168
 6169
 6170
 6171
 6172
 6173
 6174
 6175
 6176
 6177
 6178
 6179
 6180
 6181
 6182
 6183
 6184
 6185
 6186
 6187
 6188
 6189
 6190
 6191
 6192
 6193
 6194
 6195
 6196
 6197
 6198
 6199
 6200
 6201
 6202
 6203
 6204
 6205
 6206
 6207
 6208
 6209
 6210
 6211
 6212
 6213
 6214
 6215
 6216
 6217
 6218
 6219
 6220
 6221
 6222
 6223
 6224
 6225
 6226
 6227
 6228
 6229
 6230
 6231
 6232
 6233
 6234
 6235
 6236
 6237
 6238
 6239
 6240
 6241
 6242
 6243
 6244
 6245
 6246
 6247
 6248
 6249
 6250
 6251
 6252
 6253
 6254
 6255
 6256
 6257
 6258
 6259
 6260
 6261
 6262
 6263
 6264
 6265
 6266
 6267
 6268
 6269
 6270
 6271
 6272
 6273
 6274
 6275
 6276
 6277
 6278
 6279
 6280
 6281
 6282
 6283
 6284
 6285
 6286
 6287
 6288
 6289
 6290
 6291
 6292
 6293
 6294
 6295
 6296
 6297
 6298
 6299
 6300
 6301
 6302
 6303
 6304
 6305
 6306
 6307
 6308
 6309
 6310
 6311
 6312
 6313
 6314
 6315
 6316
 6317
 6318
 6319
 6320
 6321
 6322
 6323
 6324
 6325
 6326
 6327
 6328
 6329
 6330
 6331
 6332
 6333
 6334
 6335
 6336
 6337
 6338
 6339
 6340
 6341
 6342
 6343
 6344
 6345
 6346
 6347
 6348
 6349
 6350
 6351
 6352
 6353
 6354
 6355
 6356
 6357
 6358
 6359
 6360
 6361
 6362
 6363
 6364
 6365
 6366
 6367
 6368
 6369
 6370
 6371
 6372
 6373
 6374
 6375
 6376
 6377
 6378
 6379
 6380
 6381
 6382
 6383
 6384
 6385
 6386
 6387
 6388
 6389
 6390
 6391
 6392
 6393
 6394
 6395
 6396
 6397
 6398
 6399
 6400
 6401
 6402
 6403
 6404
 6405
 6406
 6407
 6408
 6409
 6410
 6411
 6412
 6413
 6414
 6415
 6416
 6417
 6418
 6419
 6420
 6421
 6422
 6423
 6424
 6425
 6426
 6427
 6428
 6429
 6430
 6431
 6432
 6433
 6434
 6435
 6436
 6437
 6438
 6439
 6440
 6441
 6442
 6443
 6444
 6445
 6446
 6447
 6448
 6449
 6450
 6451
 6452
 6453
 6454
 6455
 6456
 6457
 6458
 6459
 6460
 6461
 6462
 6463
 6464
 6465
 6466
 6467
 6468
 6469
 6470
 6471
 6472
 6473
 6474
 6475
 6476
 6477
 6478
 6479
 6480
 6481
 6482
 6483
 6484
 6485
 6486
 6487
 6488
 6489
 6490
 6491
 6492
 6493
 6494
 6495
 6496
 6497
 6498
 6499
 6500
 6501
 6502
 6503
 6504
 6505
 6506
 6507
 6508
 6509
 6510
 6511
 6512
 6513
 6514
 6515
 6516
 6517
 6518
 6519
 6520
 6521
 6522
 6523
 6524
 6525
 6526
 6527
 6528
 6529
 6530
 6531
 6532
 6533
 6534
 6535
 6536
 6537
 6538
 6539
 6540
 6541
 6542
 6543
 6544
 6545
 6546
 6547
 6548
 6549
 6550
 6551
 6552
 6553
 6554
 6555
 6556
 6557
 6558
 6559
 6560
 6561
 6562
 6563
 6564
 6565
 6566
 6567
 6568
 6569
 6570
 6571
 6572
 6573
 6574
 6575
 6576
 6577
 6578
 6579
 6580
 6581
 6582
 6583
 6584
 6585
 6586
 6587
 6588
 6589
 6590
 6591
 6592
 6593
 6594
 6595
 6596
 6597
 6598
 6599
 6600
 6601
 6602
 6603
 6604
 6605
 6606
 6607
 6608
 6609
 6610
 6611
 6612
 6613
 6614
 6615
 6616
 6617
 6618
 6619
 6620
 6621
 6622
 6623
 6624
 6625
 6626
 6627
 6628
 6629
 6630
 6631
 6632
 6633
 6634
 6635
 6636
 6637
 6638
 6639
 6640
 6641
 6642
 6643
 6644
 6645
 6646
 6647
 6648
 6649
 6650
 6651
 6652
 6653
 6654
 6655
 6656
 6657
 6658
 6659
 6660
 6661
 6662
 6663
 6664
 6665
 6666
 6667
 6668
 6669
 6670
 6671
 6672
 6673
 6674
 6675
 6676
 6677
 6678
 6679
 6680
 6681
 6682
 6683
 6684
 6685
 6686
 6687
 6688
 6689
 6690
 6691
 6692
 6693
 6694
 6695
 6696
 6697
 6698
 6699
 6700
 6701
 6702
 6703
 6704
 6705
 6706
 6707
 6708
 6709
 6710
 6711
 6712
 6713
 6714
 6715
 6716
 6717
 6718
 6719
 6720
 6721
 6722
 6723
 6724
 6725
 6726
 6727
 6728
 6729
 6730
 6731
 6732
 6733
 6734
 6735
 6736
 6737
 6738
 6739
 6740
 6741
 6742
 6743
 6744
 6745
 6746
 6747
 6748
 6749
 6750
 6751
 6752
 6753
 6754
 6755
 6756
 6757
 6758
 6759
 6760
 6761
 6762
 6763
 6764
 6765
 6766
 6767
 6768
 6769
 6770
 6771
 6772
 6773
 6774
 6775
 6776
 6777
 6778
 6779
 6780
 6781
 6782
 6783
 6784
 6785
 6786
 6787
 6788
 6789
 6790
 6791
 6792
 6793
 6794
 6795
 6796
 6797
 6798
 6799
 6800
 6801
 6802
 6803
 6804
 6805
 6806
 6807
 6808
 6809
 6810
 6811
 6812
 6813
 6814
 6815
 6816
 6817
 6818
 6819
 6820
 6821
 6822
 6823
 6824
 6825
 6826
 6827
 6828
 6829
 6830
 6831
 6832
 6833
 6834
 6835
 6836
 6837
 6838
 6839
 6840
 6841
 6842
 6843
 6844
 6845
 6846
 6847
 6848
 6849
 6850
 6851
 6852
 6853
 6854
 6855
 6856
 6857
 6858
 6859
 6860
 6861
 6862
 6863
 6864
 6865
 6866
 6867
 6868
 6869
 6870
 6871
 6872
 6873
 6874
 6875
 6876
 6877
 6878
 6879
 6880
 6881
 6882
 6883
 6884
 6885
 6886
 6887
 6888
 6889
 6890
 6891
 6892
 6893
 6894
 6895
 6896
 6897
 6898
 6899
 6900
 6901
 6902
 6903
 6904
 6905
 6906
 6907
 6908
 6909
 6910
 6911
 6912
 6913
 6914
 6915
 6916
 6917
 6918
 6919
 6920
 6921
 6922
 6923
 6924
 6925
 6926
 6927
 6928
 6929
 6930
 6931
 6932
 6933
 6934
 6935
 6936
 6937
 6938
 6939
 6940
 6941
 6942
 6943
 6944
 6945
 6946
 6947
 6948
 6949
 6950
 6951
 6952
 6953
 6954
 6955
 6956
 6957
 6958
 6959
 6960
 6961
 6962
 6963
 6964
 6965
 6966
 6967
 6968
 6969
 6970
 6971
 6972
 6973
 6974
 6975
 6976
 6977
 6978
 6979
 6980
 6981
 6982
 6983
 6984
 6985
 6986
 6987
 6988
 6989
 6990
 6991
 6992
 6993
 6994
 6995
 6996
 6997
 6998
 6999
 7000
 7001
 7002
 7003
 7004
 7005
 7006
 7007
 7008
 7009
 7010
 7011
 7012
 7013
 7014
 7015
 7016
 7017
 7018
 7019
 7020
 7021
 7022
 7023
 7024
 7025
 7026
 7027
 7028
 7029
 7030
 7031
 7032
 7033
 7034
 7035
 7036
 7037
 7038
 7039
 7040
 7041
 7042
 7043
 7044
 7045
 7046
 7047
 7048
 7049
 7050
 7051
 7052
 7053
 7054
 7055
 7056
 7057
 7058
 7059
 7060
 7061
 7062
 7063
 7064
 7065
 7066
 7067
 7068
 7069
 7070
 7071
 7072
 7073
 7074
 7075
 7076
 7077
 7078
 7079
 7080
 7081
 7082
 7083
 7084
 7085
 7086
 7087
 7088
 7089
 7090
 7091
 7092
 7093
 7094
 7095
 7096
 7097
 7098
 7099
 7100
 7101
 7102
 7103
 7104
 7105
 7106
 7107
 7108
 7109
 7110
 7111
 7112
 7113
 7114
 7115
 7116
 7117
 7118
 7119
 7120
 7121
 7122
 7123
 7124
 7125
 7126
 7127
 7128
 7129
 7130
 7131
 7132
 7133
 7134
 7135
 7136
 7137
 7138
 7139
 7140
 7141
 7142
 7143
 7144
 7145
 7146
 7147
 7148
 7149
 7150
 7151
 7152
 7153
 7154
 7155
 7156
 7157
 7158
 7159
 7160
 7161
 7162
 7163
 7164
 7165
 7166
 7167
 7168
 7169
 7170
 7171
 7172
 7173
 7174
 7175
 7176
 7177
 7178
 7179
 7180
 7181
 7182
 7183
 7184
 7185
 7186
 7187
 7188
 7189
 7190
 7191
 7192
 7193
 7194
 7195
 7196
 7197
 7198
 7199
 7200
 7201
 7202
 7203
 7204
 7205
 7206
 7207
 7208
 7209
 7210
 7211
 7212
 7213
 7214
 7215
 7216
 7217
 7218
 7219
 7220
 7221
 7222
 7223
 7224
 7225
 7226
 7227
 7228
 7229
 7230
 7231
 7232
 7233
 7234
 7235
 7236
 7237
 7238
 7239
 7240
 7241
 7242
 7243
 7244
 7245
 7246
 7247
 7248
 7249
 7250
 7251
 7252
 7253
 7254
 7255
 7256
 7257
 7258
 7259
 7260
 7261
 7262
 7263
 7264
 7265
 7266
 7267
 7268
 7269
 7270
 7271
 7272
 7273
 7274
 7275
 7276
 7277
 7278
 7279
 7280
 7281
 7282
 7283
 7284
 7285
 7286
 7287
 7288
 7289
 7290
 7291
 7292
 7293
 7294
 7295
 7296
 7297
 7298
 7299
 7300
 7301
 7302
 7303
 7304
 7305
 7306
 7307
 7308
 7309
 7310
 7311
 7312
 7313
 7314
 7315
 7316
 7317
 7318
 7319
 7320
 7321
 7322
 7323
 7324
 7325
 7326
 7327
 7328
 7329
 7330
 7331
 7332
 7333
 7334
 7335
 7336
 7337
 7338
 7339
 7340
 7341
 7342
 7343
 7344
 7345
 7346
 7347
 7348
 7349
 7350
 7351
 7352
 7353
 7354
 7355
 7356
 7357
 7358
 7359
 7360
 7361
 7362
 7363
 7364
 7365
 7366
 7367
 7368
 7369
 7370
 7371
 7372
 7373
 7374
 7375
 7376
 7377
 7378
 7379
 7380
 7381
 7382
 7383
 7384
 7385
 7386
 7387
 7388
 7389
 7390
 7391
 7392
 7393
 7394
 7395
 7396
 7397
 7398
 7399
 7400
 7401
 7402
 7403
 7404
 7405
 7406
 7407
 7408
 7409
 7410
 7411
 7412
 7413
 7414
 7415
 7416
 7417
 7418
 7419
 7420
 7421
 7422
 7423
 7424
 7425
 7426
 7427
 7428
 7429
 7430
 7431
 7432
 7433
 7434
 7435
 7436
 7437
 7438
 7439
 7440
 7441
 7442
 7443
 7444
 7445
 7446
 7447
 7448
 7449
 7450
 7451
 7452
 7453
 7454
 7455
 7456
 7457
 7458
 7459
 7460
 7461
 7462
 7463
 7464
 7465
 7466
 7467
 7468
 7469
 7470
 7471
 7472
 7473
 7474
 7475
 7476
 7477
 7478
 7479
 7480
 7481
 7482
 7483
 7484
 7485
 7486
 7487
 7488
 7489
 7490
 7491
 7492
 7493
 7494
 7495
 7496
 7497
 7498
 7499
 7500
 7501
 7502
 7503
 7504
 7505
 7506
 7507
 7508
 7509
 7510
 7511
 7512
 7513
 7514
 7515
 7516
 7517
 7518
 7519
 7520
 7521
 7522
 7523
 7524
 7525
 7526
 7527
 7528
 7529
 7530
 7531
 7532
 7533
 7534
 7535
 7536
 7537
 7538
 7539
 7540
 7541
 7542
 7543
 7544
 7545
 7546
 7547
 7548
 7549
 7550
 7551
 7552
 7553
 7554
 7555
 7556
 7557
 7558
 7559
 7560
 7561
 7562
 7563
 7564
 7565
 7566
 7567
 7568
 7569
 7570
 7571
 7572
 7573
 7574
 7575
 7576
 7577
 7578
 7579
 7580
 7581
 7582
 7583
 7584
 7585
 7586
 7587
 7588
 7589
 7590
 7591
 7592
 7593
 7594
 7595
 7596
 7597
 7598
 7599
 7600
 7601
 7602
 7603
 7604
 7605
 7606
 7607
 7608
 7609
 7610
 7611
 7612
 7613
 7614
 7615
 7616
 7617
 7618
 7619
 7620
 7621
 7622
 7623
 7624
 7625
 7626
 7627
 7628
 7629
 7630
 7631
 7632
 7633
 7634
 7635
 7636
 7637
 7638
 7639
 7640
 7641
 7642
 7643
 7644
 7645
 7646
 7647
 7648
 7649
 7650
 7651
 7652
 7653
 7654
 7655
 7656
 7657
 7658
 7659
 7660
 7661
 7662
 7663
 7664
 7665
 7666
 7667
 7668
 7669
 7670
 7671
 7672
 7673
 7674
 7675
 7676
 7677
 7678
 7679
 7680
 7681
 7682
 7683
 7684
 7685
 7686
 7687
 7688
 7689
 7690
 7691
 7692
 7693
 7694
 7695
 7696
 7697
 7698
 7699
 7700
 7701
 7702
 7703
 7704
 7705
 7706
 7707
 7708
 7709
 7710
 7711
 7712
 7713
 7714
 7715
 7716
 7717
 7718
 7719
 7720
 7721
 7722
 7723
 7724
 7725
 7726
 7727
 7728
 7729
 7730
 7731
 7732
 7733
 7734
 7735
 7736
 7737
 7738
 7739
 7740
 7741
 7742
 7743
 7744
 7745
 7746
 7747
 7748
 7749
 7750
 7751
 7752
 7753
 7754
 7755
 7756
 7757
 7758
 7759
 7760
 7761
 7762
 7763
 7764
 7765
 7766
 7767
 7768
 7769
 7770
 7771
 7772
 7773
 7774
 7775
 7776
 7777
 7778
 7779
 7780
 7781
 7782
 7783
 7784
 7785
 7786
 7787
 7788
 7789
 7790
 7791
 7792
 7793
 7794
 7795
 7796
 7797
 7798
 7799
 7800
 7801
 7802
 7803
 7804
 7805
 7806
 7807
 7808
 7809
 7810
 7811
 7812
 7813
 7814
 7815
 7816
 7817
 7818
 7819
 7820
 7821
 7822
 7823
 7824
 7825
 7826
 7827
 7828
 7829
 7830
 7831
 7832
 7833
 7834
 7835
 7836
 7837
 7838
 7839
 7840
 7841
 7842
 7843
 7844
 7845
 7846
 7847
 7848
 7849
 7850
 7851
 7852
 7853
 7854
 7855
 7856
 7857
 7858
 7859
 7860
 7861
 7862
 7863
 7864
 7865
 7866
 7867
 7868
 7869
 7870
 7871
 7872
 7873
 7874
 7875
 7876
 7877
 7878
 7879
 7880
 7881
 7882
 7883
 7884
 7885
 7886
 7887
 7888
 7889
 7890
 7891
 7892
 7893
 7894
 7895
 7896
 7897
 7898
 7899
 7900
 7901
 7902
 7903
 7904
 7905
 7906
 7907
 7908
 7909
 7910
 7911
 7912
 7913
 7914
 7915
 7916
 7917
 7918
 7919
 7920
 7921
 7922
 7923
 7924
 7925
 7926
 7927
 7928
 7929
 7930
 7931
 7932
 7933
 7934
 7935
 7936
 7937
 7938
 7939
 7940
 7941
 7942
 7943
 7944
 7945
 7946
 7947
 7948
 7949
 7950
 7951
 7952
 7953
 7954
 7955
 7956
 7957
 7958
 7959
 7960
 7961
 7962
 7963
 7964
 7965
 7966
 7967
 7968
 7969
 7970
 7971
 7972
 7973
 7974
 7975
 7976
 7977
 7978
 7979
 7980
 7981
 7982
 7983
 7984
 7985
 7986
 7987
 7988
 7989
 7990
 7991
 7992
 7993
 7994
 7995
 7996
 7997
 7998
 7999
 8000
 8001
 8002
 8003
 8004
 8005
 8006
 8007
 8008
 8009
 8010
 8011
 8012
 8013
 8014
 8015
 8016
 8017
 8018
 8019
 8020
 8021
 8022
 8023
 8024
 8025
 8026
 8027
 8028
 8029
 8030
 8031
 8032
 8033
 8034
 8035
 8036
 8037
 8038
 8039
 8040
 8041
 8042
 8043
 8044
 8045
 8046
 8047
 8048
 8049
 8050
 8051
 8052
 8053
 8054
 8055
 8056
 8057
 8058
 8059
 8060
 8061
 8062
 8063
 8064
 8065
 8066
 8067
 8068
 8069
 8070
 8071
 8072
 8073
 8074
 8075
 8076
 8077
 8078
 8079
 8080
 8081
 8082
 8083
 8084
 8085
 8086
 8087
 8088
 8089
 8090
 8091
 8092
 8093
 8094
 8095
 8096
 8097
 8098
 8099
 8100
 8101
 8102
 8103
 8104
 8105
 8106
 8107
 8108
 8109
 8110
 8111
 8112
 8113
 8114
 8115
 8116
 8117
 8118
 8119
 8120
 8121
 8122
 8123
 8124
 8125
 8126
 8127
 8128
 8129
 8130
 8131
 8132
 8133
 8134
 8135
 8136
 8137
 8138
 8139
 8140
 8141
 8142
 8143
 8144
 8145
 8146
 8147
 8148
 8149
 8150
 8151
 8152
 8153
 8154
 8155
 8156
 8157
 8158
 8159
 8160
 8161
 8162
 8163
 8164
 8165
 8166
 8167
 8168
 8169
 8170
 8171
 8172
 8173
 8174
 8175
 8176
 8177
 8178
 8179
 8180
 8181
 8182
 8183
 8184
 8185
 8186
 8187
 8188
 8189
 8190
 8191
 8192
 8193
 8194
 8195
 8196
 8197
 8198
 8199
 8200
 8201
 8202
 8203
 8204
 8205
 8206
 8207
 8208
 8209
 8210
 8211
 8212
 8213
 8214
 8215
 8216
 8217
 8218
 8219
 8220
 8221
 8222
 8223
 8224
 8225
 8226
 8227
 8228
 8229
 8230
 8231
 8232
 8233
 8234
 8235
 8236
 8237
 8238
 8239
 8240
 8241
 8242
 8243
 8244
 8245
 8246
 8247
 8248
 8249
 8250
 8251
 8252
 8253
 8254
 8255
 8256
 8257
 8258
 8259
 8260
 8261
 8262
 8263
 8264
 8265
 8266
 8267
 8268
 8269
 8270
 8271
 8272
 8273
 8274
 8275
 8276
 8277
 8278
 8279
 8280
 8281
 8282
 8283
 8284
 8285
 8286
 8287
 8288
 8289
 8290
 8291
 8292
 8293
 8294
 8295
 8296
 8297
 8298
 8299
 8300
 8301
 8302
 8303
 8304
 8305
 8306
 8307
 8308
 8309
 8310
 8311
 8312
 8313
 8314
 8315
 8316
 8317
 8318
 8319
 8320
 8321
 8322
 8323
 8324
 8325
 8326
 8327
 8328
 8329
 8330
 8331
 8332
 8333
 8334
 8335
 8336
 8337
 8338
 8339
 8340
 8341
 8342
 8343
 8344
 8345
 8346
 8347
 8348
 8349
 8350
 8351
 8352
 8353
 8354
 8355
 8356
 8357
 8358
 8359
 8360
 8361
 8362
 8363
 8364
 8365
 8366
 8367
 8368
 8369
 8370
 8371
 8372
 8373
 8374
 8375
 8376
 8377
 8378
 8379
 8380
 8381
 8382
 8383
 8384
 8385
 8386
 8387
 8388
 8389
 8390
 8391
 8392
 8393
 8394
 8395
 8396
 8397
 8398
 8399
 8400
 8401
 8402
 8403
 8404
 8405
 8406
 8407
 8408
 8409
 8410
 8411
 8412
 8413
 8414
 8415
 8416
 8417
 8418
 8419
 8420
 8421
 8422
 8423
 8424
 8425
 8426
 8427
 8428
 8429
 8430
 8431
 8432
 8433
 8434
 8435
 8436
 8437
 8438
 8439
 8440
 8441
 8442
 8443
 8444
 8445
 8446
 8447
 8448
 8449
 8450
 8451
 8452
 8453
 8454
 8455
 8456
 8457
 8458
 8459
 8460
 8461
 8462
 8463
 8464
 8465
 8466
 8467
 8468
 8469
 8470
 8471
 8472
 8473
 8474
 8475
 8476
 8477
 8478
 8479
 8480
 8481
 8482
 8483
 8484
 8485
 8486
 8487
 8488
 8489
 8490
 8491
 8492
 8493
 8494
 8495
 8496
 8497
 8498
 8499
 8500
 8501
 8502
 8503
 8504
 8505
 8506
 8507
 8508
 8509
 8510
 8511
 8512
 8513
 8514
 8515
 8516
 8517
 8518
 8519
 8520
 8521
 8522
 8523
 8524
 8525
 8526
 8527
 8528
 8529
 8530
 8531
 8532
 8533
 8534
 8535
 8536
 8537
 8538
 8539
 8540
 8541
 8542
 8543
 8544
 8545
 8546
 8547
 8548
 8549
 8550
 8551
 8552
 8553
 8554
 8555
 8556
 8557
 8558
 8559
 8560
 8561
 8562
 8563
 8564
 8565
 8566
 8567
 8568
 8569
 8570
 8571
 8572
 8573
 8574
 8575
 8576
 8577
 8578
 8579
 8580
 8581
 8582
 8583
 8584
 8585
 8586
 8587
 8588
 8589
 8590
 8591
 8592
 8593
 8594
 8595
 8596
 8597
 8598
 8599
 8600
 8601
 8602
 8603
 8604
 8605
 8606
 8607
 8608
 8609
 8610
 8611
 8612
 8613
 8614
 8615
 8616
 8617
 8618
 8619
 8620
 8621
 8622
 8623
 8624
 8625
 8626
 8627
 8628
 8629
 8630
 8631
 8632
 8633
 8634
 8635
 8636
 8637
 8638
 8639
 8640
 8641
 8642
 8643
 8644
 8645
 8646
 8647
 8648
 8649
 8650
 8651
 8652
 8653
 8654
 8655
 8656
 8657
 8658
 8659
 8660
 8661
 8662
 8663
 8664
 8665
 8666
 8667
 8668
 8669
 8670
 8671
 8672
 8673
 8674
 8675
 8676
 8677
 8678
 8679
 8680
 8681
 8682
 8683
 8684
 8685
 8686
 8687
 8688
 8689
 8690
 8691
 8692
 8693
 8694
 8695
 8696
 8697
 8698
 8699
 8700
 8701
 8702
 8703
 8704
 8705
 8706
 8707
 8708
 8709
 8710
 8711
 8712
 8713
 8714
 8715
 8716
 8717
 8718
 8719
 8720
 8721
 8722
 8723
 8724
 8725
 8726
 8727
 8728
 8729
 8730
 8731
 8732
 8733
 8734
 8735
 8736
 8737
 8738
 8739
 8740
 8741
 8742
 8743
 8744
 8745
 8746
 8747
 8748
 8749
 8750
 8751
 8752
 8753
 8754
 8755
 8756
 8757
 8758
 8759
 8760
 8761
 8762
 8763
 8764
 8765
 8766
 8767
 8768
 8769
 8770
 8771
 8772
 8773
 8774
 8775
 8776
 8777
 8778
 8779
 8780
 8781
 8782
 8783
 8784
 8785
 8786
 8787
 8788
 8789
 8790
 8791
 8792
 8793
 8794
 8795
 8796
 8797
 8798
 8799
 8800
 8801
 8802
 8803
 8804
 8805
 8806
 8807
 8808
 8809
 8810
 8811
 8812
 8813
 8814
 8815
 8816
 8817
 8818
 8819
 8820
 8821
 8822
 8823
 8824
 8825
 8826
 8827
 8828
 8829
 8830
 8831
 8832
 8833
 8834
 8835
 8836
 8837
 8838
 8839
 8840
 8841
 8842
 8843
 8844
 8845
 8846
 8847
 8848
 8849
 8850
 8851
 8852
 8853
 8854
 8855
 8856
 8857
 8858
 8859
 8860
 8861
 8862
 8863
 8864
 8865
 8866
 8867
 8868
 8869
 8870
 8871
 8872
 8873
 8874
 8875
 8876
 8877
 8878
 8879
 8880
 8881
 8882
 8883
 8884
 8885
 8886
 8887
 8888
 8889
 8890
 8891
 8892
 8893
 8894
 8895
 8896
 8897
 8898
 8899
 8900
 8901
 8902
 8903
 8904
 8905
 8906
 8907
 8908
 8909
 8910
 8911
 8912
 8913
 8914
 8915
 8916
 8917
 8918
 8919
 8920
 8921
 8922
 8923
 8924
 8925
 8926
 8927
 8928
 8929
 8930
 8931
 8932
 8933
 8934
 8935
 8936
 8937
 8938
 8939
 8940
 8941
 8942
 8943
 8944
 8945
 8946
 8947
 8948
 8949
 8950
 8951
 8952
 8953
 8954
 8955
 8956
 8957
 8958
 8959
 8960
 8961
 8962
 8963
 8964
 8965
 8966
 8967
 8968
 8969
 8970
 8971
 8972
 8973
 8974
 8975
 8976
 8977
 8978
 8979
 8980
 8981
 8982
 8983
 8984
 8985
 8986
 8987
 8988
 8989
 8990
 8991
 8992
 8993
 8994
 8995
 8996
 8997
 8998
 8999
 9000
 9001
 9002
 9003
 9004
 9005
 9006
 9007
 9008
 9009
 9010
 9011
 9012
 9013
 9014
 9015
 9016
 9017
 9018
 9019
 9020
 9021
 9022
 9023
 9024
 9025
 9026
 9027
 9028
 9029
 9030
 9031
 9032
 9033
 9034
 9035
 9036
 9037
 9038
 9039
 9040
 9041
 9042
 9043
 9044
 9045
 9046
 9047
 9048
 9049
 9050
 9051
 9052
 9053
 9054
 9055
 9056
 9057
 9058
 9059
 9060
 9061
 9062
 9063
 9064
 9065
 9066
 9067
 9068
 9069
 9070
 9071
 9072
 9073
 9074
 9075
 9076
 9077
 9078
 9079
 9080
 9081
 9082
 9083
 9084
 9085
 9086
 9087
 9088
 9089
 9090
 9091
 9092
 9093
 9094
 9095
 9096
 9097
 9098
 9099
 9100
 9101
 9102
 9103
 9104
 9105
 9106
 9107
 9108
 9109
 9110
 9111
 9112
 9113
 9114
 9115
 9116
 9117
 9118
 9119
 9120
 9121
 9122
 9123
 9124
 9125
 9126
 9127
 9128
 9129
 9130
 9131
 9132
 9133
 9134
 9135
 9136
 9137
 9138
 9139
 9140
 9141
 9142
 9143
 9144
 9145
 9146
 9147
 9148
 9149
 9150
 9151
 9152
 9153
 9154
 9155
 9156
 9157
 9158
 9159
 9160
 9161
 9162
 9163
 9164
 9165
 9166
 9167
 9168
 9169
 9170
 9171
 9172
 9173
 9174
 9175
 9176
 9177
 9178
 9179
 9180
 9181
 9182
 9183
 9184
 9185
 9186
 9187
 9188
 9189
 9190
 9191
 9192
 9193
 9194
 9195
 9196
 9197
 9198
 9199
 9200
 9201
 9202
 9203
 9204
 9205
 9206
 9207
 9208
 9209
 9210
 9211
 9212
 9213
 9214
 9215
 9216
 9217
 9218
 9219
 9220
 9221
 9222
 9223
 9224
 9225
 9226
 9227
 9228
 9229
 9230
 9231
 9232
 9233
 9234
 9235
 9236
 9237
 9238
 9239
 9240
 9241
 9242
 9243
 9244
 9245
 9246
 9247
 9248
 9249
 9250
 9251
 9252
 9253
 9254
 9255
 9256
 9257
 9258
 9259
 9260
 9261
 9262
 9263
 9264
 9265
 9266
 9267
 9268
 9269
 9270
 9271
 9272
 9273
 9274
 9275
 9276
 9277
 9278
 9279
 9280
 9281
 9282
 9283
 9284
 9285
 9286
 9287
 9288
 9289
 9290
 9291
 9292
 9293
 9294
 9295
 9296
 9297
 9298
 9299
 9300
 9301
 9302
 9303
 9304
 9305
 9306
 9307
 9308
 9309
 9310
 9311
 9312
 9313
 9314
 9315
 9316
 9317
 9318
 9319
 9320
 9321
 9322
 9323
 9324
 9325
 9326
 9327
 9328
 9329
 9330
 9331
 9332
 9333
 9334
 9335
 9336
 9337
 9338
 9339
 9340
 9341
 9342
 9343
 9344
 9345
 9346
 9347
 9348
 9349
 9350
 9351
 9352
 9353
 9354
 9355
 9356
 9357
 9358
 9359
 9360
 9361
 9362
 9363
 9364
 9365
 9366
 9367
 9368
 9369
 9370
 9371
 9372
 9373
 9374
 9375
 9376
 9377
 9378
 9379
 9380
 9381
 9382
 9383
 9384
 9385
 9386
 9387
 9388
 9389
 9390
 9391
 9392
 9393
 9394
 9395
 9396
 9397
 9398
 9399
 9400
 9401
 9402
 9403
 9404
 9405
 9406
 9407
 9408
 9409
 9410
 9411
 9412
 9413
 9414
 9415
 9416
 9417
 9418
 9419
 9420
 9421
 9422
 9423
 9424
 9425
 9426
 9427
 9428
 9429
 9430
 9431
 9432
 9433
 9434
 9435
 9436
 9437
 9438
 9439
 9440
 9441
 9442
 9443
 9444
 9445
 9446
 9447
 9448
 9449
 9450
 9451
 9452
 9453
 9454
 9455
 9456
 9457
 9458
 9459
 9460
 9461
 9462
 9463
 9464
 9465
 9466
 9467
 9468
 9469
 9470
 9471
 9472
 9473
 9474
 9475
 9476
 9477
 9478
 9479
 9480
 9481
 9482
 9483
 9484
 9485
 9486
 9487
 9488
 9489
 9490
 9491
 9492
 9493
 9494
 9495
 9496
 9497
 9498
 9499
 9500
 9501
 9502
 9503
 9504
 9505
 9506
 9507
 9508
 9509
 9510
 9511
 9512
 9513
 9514
 9515
 9516
 9517
 9518
 9519
 9520
 9521
 9522
 9523
 9524
 9525
 9526
 9527
 9528
 9529
 9530
 9531
 9532
 9533
 9534
 9535
 9536
 9537
 9538
 9539
 9540
 9541
 9542
 9543
 9544
 9545
 9546
 9547
 9548
 9549
 9550
 9551
 9552
 9553
 9554
 9555
 9556
 9557
 9558
 9559
 9560
 9561
 9562
 9563
 9564
 9565
 9566
 9567
 9568
 9569
 9570
 9571
 9572
 9573
 9574
 9575
 9576
 9577
 9578
 9579
 9580
 9581
 9582
 9583
 9584
 9585
 9586
 9587
 9588
 9589
 9590
 9591
 9592
 9593
 9594
 9595
 9596
 9597
 9598
 9599
 9600
 9601
 9602
 9603
 9604
 9605
 9606
 9607
 9608
 9609
 9610
 9611
 9612
 9613
 9614
 9615
 9616
 9617
 9618
 9619
 9620
 9621
 9622
 9623
 9624
 9625
 9626
 9627
 9628
 9629
 9630
 9631
 9632
 9633
 9634
 9635
 9636
 9637
 9638
 9639
 9640
 9641
 9642
 9643
 9644
 9645
 9646
 9647
 9648
 9649
 9650
 9651
 9652
 9653
 9654
 9655
 9656
 9657
 9658
 9659
 9660
 9661
 9662
 9663
 9664
 9665
 9666
 9667
 9668
 9669
 9670
 9671
 9672
 9673
 9674
 9675
 9676
 9677
 9678
 9679
 9680
 9681
 9682
 9683
 9684
 9685
 9686
 9687
 9688
 9689
 9690
 9691
 9692
 9693
 9694
 9695
 9696
 9697
 9698
 9699
 9700
 9701
 9702
 9703
 9704
 9705
 9706
 9707
 9708
 9709
 9710
 9711
 9712
 9713
 9714
 9715
 9716
 9717
 9718
 9719
 9720
 9721
 9722
 9723
 9724
 9725
 9726
 9727
 9728
 9729
 9730
 9731
 9732
 9733
 9734
 9735
 9736
 9737
 9738
 9739
 9740
 9741
 9742
 9743
 9744
 9745
 9746
 9747
 9748
 9749
 9750
 9751
 9752
 9753
 9754
 9755
 9756
 9757
 9758
 9759
 9760
 9761
 9762
 9763
 9764
 9765
 9766
 9767
 9768
 9769
 9770
 9771
 9772
 9773
 9774
 9775
 9776
 9777
 9778
 9779
 9780
 9781
 9782
 9783
 9784
 9785
 9786
 9787
 9788
 9789
 9790
 9791
 9792
 9793
 9794
 9795
 9796
 9797
 9798
 9799
 9800
 9801
 9802
 9803
 9804
 9805
 9806
 9807
 9808
 9809
 9810
 9811
 9812
 9813
 9814
 9815
 9816
 9817
 9818
 9819
 9820
 9821
 9822
 9823
 9824
 9825
 9826
 9827
 9828
 9829
 9830
 9831
 9832
 9833
 9834
 9835
 9836
 9837
 9838
 9839
 9840
 9841
 9842
 9843
 9844
 9845
 9846
 9847
 9848
 9849
 9850
 9851
 9852
 9853
 9854
 9855
 9856
 9857
 9858
 9859
 9860
 9861
 9862
 9863
 9864
 9865
 9866
 9867
 9868
 9869
 9870
 9871
 9872
 9873
 9874
 9875
 9876
 9877
 9878
 9879
 9880
 9881
 9882
 9883
 9884
 9885
 9886
 9887
 9888
 9889
 9890
 9891
 9892
 9893
 9894
 9895
 9896
 9897
 9898
 9899
 9900
 9901
 9902
 9903
 9904
 9905
 9906
 9907
 9908
 9909
 9910
 9911
 9912
 9913
 9914
 9915
 9916
 9917
 9918
 9919
 9920
 9921
 9922
 9923
 9924
 9925
 9926
 9927
 9928
 9929
 9930
 9931
 9932
 9933
 9934
 9935
 9936
 9937
 9938
 9939
 9940
 9941
 9942
 9943
 9944
 9945
 9946
 9947
 9948
 9949
 9950
 9951
 9952
 9953
 9954
 9955
 9956
 9957
 9958
 9959
 9960
 9961
 9962
 9963
 9964
 9965
 9966
 9967
 9968
 9969
 9970
 9971
 9972
 9973
 9974
 9975
 9976
 9977
 9978
 9979
 9980
 9981
 9982
 9983
 9984
 9985
 9986
 9987
 9988
 9989
 9990
 9991
 9992
 9993
 9994
 9995
 9996
 9997
 9998
 9999
10000
10001
10002
10003
10004
10005
10006
10007
10008
10009
10010
10011
10012
10013
10014
10015
10016
10017
10018
10019
10020
10021
10022
10023
10024
10025
10026
10027
10028
10029
10030
10031
10032
10033
10034
10035
10036
10037
10038
10039
10040
10041
10042
10043
10044
10045
10046
10047
10048
10049
10050
10051
10052
10053
10054
10055
10056
10057
10058
10059
10060
10061
10062
10063
10064
10065
10066
10067
10068
10069
10070
10071
10072
10073
10074
10075
10076
10077
10078
10079
10080
10081
10082
10083
10084
10085
10086
10087
10088
10089
10090
10091
10092
10093
10094
10095
10096
10097
10098
10099
10100
10101
10102
10103
10104
10105
10106
10107
10108
10109
10110
10111
10112
10113
10114
10115
10116
10117
10118
10119
10120
10121
10122
10123
10124
10125
10126
10127
10128
10129
10130
10131
10132
10133
10134
10135
10136
10137
10138
10139
10140
10141
10142
10143
10144
10145
10146
10147
10148
10149
10150
10151
10152
10153
10154
10155
10156
10157
10158
10159
10160
10161
10162
10163
10164
10165
10166
10167
10168
10169
10170
10171
10172
10173
10174
10175
10176
10177
10178
10179
10180
10181
10182
10183
10184
10185
10186
10187
10188
10189
10190
10191
10192
10193
10194
10195
10196
10197
10198
10199
10200
10201
10202
10203
10204
10205
10206
10207
10208
10209
10210
10211
10212
10213
10214
10215
10216
10217
10218
10219
10220
10221
10222
10223
10224
10225
10226
10227
10228
10229
10230
10231
10232
10233
10234
10235
10236
10237
10238
10239
10240
10241
10242
10243
10244
10245
10246
10247
10248
10249
10250
10251
10252
10253
10254
10255
10256
10257
10258
10259
10260
10261
10262
10263
10264
10265
10266
10267
10268
10269
 
;;; window.el --- GNU Emacs window commands aside from those written in C  -*- lexical-binding:t -*-

;; Copyright (C) 1985, 1989, 1992-1994, 2000-2021 Free Software
;; Foundation, Inc.

;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Window tree functions.

;;; Code:

(defun internal--before-save-selected-window ()
  (cons (selected-window)
        ;; We save and restore all frames' selected windows, because
        ;; `select-window' can change the frame-selected-window of
        ;; whatever frame that window is in.  Each text terminal's
        ;; top-frame is preserved by putting it last in the list.
        (apply #'append
               (mapcar (lambda (terminal)
                         (let ((frames (frames-on-display-list terminal))
                               (top-frame (tty-top-frame terminal))
                               alist)
                           (if top-frame
                               (setq frames
                                     (cons top-frame
                                           (delq top-frame frames))))
                           (dolist (f frames)
                             (push (cons f (frame-selected-window f))
                                   alist))
                           alist))
                       (terminal-list)))))

(defun internal--after-save-selected-window (state)
  (dolist (elt (cdr state))
    (and (frame-live-p (car elt))
         (window-live-p (cdr elt))
         (set-frame-selected-window (car elt) (cdr elt) 'norecord)))
  (when (window-live-p (car state))
    (select-window (car state) 'norecord)))

(defmacro save-selected-window (&rest body)
  "Execute BODY, then select the previously selected window.
The value returned is the value of the last form in BODY.

This macro saves and restores the selected window, as well as the
selected window in each frame.  If the previously selected window
is no longer live, then whatever window is selected at the end of
BODY remains selected.  If the previously selected window of some
frame is no longer live at the end of BODY, that frame's selected
window is left alone.

This macro saves and restores the current buffer, since otherwise
its normal operation could make a different buffer current.  The
order of recently selected windows and the buffer list ordering
are not altered by this macro (unless they are altered in BODY)."
  (declare (indent 0) (debug t))
  `(let ((save-selected-window--state (internal--before-save-selected-window)))
     (save-current-buffer
       (unwind-protect
	   (progn ,@body)
         (internal--after-save-selected-window save-selected-window--state)))))

(defvar temp-buffer-window-setup-hook nil
  "Normal hook run by `with-temp-buffer-window' before buffer display.
This hook is run by `with-temp-buffer-window' with the buffer to be
displayed current.")

(defvar temp-buffer-window-show-hook nil
  "Normal hook run by `with-temp-buffer-window' after buffer display.
This hook is run by `with-temp-buffer-window' with the buffer
displayed and current and its window selected.")

(defun temp-buffer-window-setup (buffer-or-name)
  "Set up temporary buffer specified by BUFFER-OR-NAME.
Return the buffer."
  (let ((old-dir default-directory)
	(buffer (get-buffer-create buffer-or-name)))
    (with-current-buffer buffer
      (kill-all-local-variables)
      (setq default-directory old-dir)
      (delete-all-overlays)
      (setq buffer-read-only nil)
      (setq buffer-file-name nil)
      (setq buffer-undo-list t)
      (let ((inhibit-read-only t)
	    (inhibit-modification-hooks t))
	(erase-buffer)
	(run-hooks 'temp-buffer-window-setup-hook))
      ;; Return the buffer.
      buffer)))

(defun temp-buffer-window-show (buffer &optional action)
  "Show temporary buffer BUFFER in a window.
Return the window showing BUFFER.  Pass ACTION as action argument
to `display-buffer'."
  (let (window frame)
    (with-current-buffer buffer
      (set-buffer-modified-p nil)
      (setq buffer-read-only t)
      (goto-char (point-min))
      (when (let ((window-combination-limit
		   ;; When `window-combination-limit' equals
		   ;; `temp-buffer' or `temp-buffer-resize' and
		   ;; `temp-buffer-resize-mode' is enabled in this
		   ;; buffer bind it to t so resizing steals space
		   ;; preferably from the window that was split.
		   (if (or (eq window-combination-limit 'temp-buffer)
			   (and (eq window-combination-limit
				    'temp-buffer-resize)
				temp-buffer-resize-mode))
		       t
		     window-combination-limit)))
	      (setq window (display-buffer buffer action)))
	(setq frame (window-frame window))
	(unless (eq frame (selected-frame))
	  (raise-frame frame))
	(setq minibuffer-scroll-window window)
	(set-window-hscroll window 0)
	(with-selected-window window
	  (run-hooks 'temp-buffer-window-show-hook)
	  (when temp-buffer-resize-mode
	    (resize-temp-buffer-window window)))
	;; Return the window.
	window))))

(defmacro with-temp-buffer-window (buffer-or-name action quit-function &rest body)
  "Bind `standard-output' to BUFFER-OR-NAME, eval BODY, show the buffer.
BUFFER-OR-NAME must specify either a live buffer, or the name of
a buffer (if it does not exist, this macro creates it).

Make the buffer specified by BUFFER-OR-NAME empty before running
BODY and bind `standard-output' to that buffer, so that output
generated with `prin1' and similar functions in BODY goes into
that buffer.  Do not make that buffer current for running the
forms in BODY.  Use `with-current-buffer-window' instead if you
need to run BODY with that buffer current.

At the end of BODY, mark the specified buffer unmodified and
read-only, and display it in a window (but do not select it).
The display happens by calling `display-buffer' passing it the
ACTION argument.  If `temp-buffer-resize-mode' is enabled, the
corresponding window may be resized automatically.

Return the value returned by BODY, unless QUIT-FUNCTION specifies
a function.  In that case, run that function with two arguments -
the window showing the specified buffer and the value returned by
BODY - and return the value returned by that function.

If the buffer is displayed on a new frame, the window manager may
decide to select that frame.  In that case, it's usually a good
strategy if QUIT-FUNCTION selects the window showing the buffer
before reading any value from the minibuffer; for example, when
asking a `yes-or-no-p' question.

This runs the hook `temp-buffer-window-setup-hook' before BODY,
with the specified buffer temporarily current.  It runs the hook
`temp-buffer-window-show-hook' after displaying the buffer, with
that buffer temporarily current, and the window that was used to
display it temporarily selected.

This construct is similar to `with-output-to-temp-buffer' but,
neither runs `temp-buffer-setup-hook' which usually puts the
buffer in Help mode, nor `temp-buffer-show-function' (the ACTION
argument replaces this)."
  (declare (debug t) (indent 3))
  (let ((buffer (make-symbol "buffer"))
	(window (make-symbol "window"))
	(value (make-symbol "value")))
    (macroexp-let2* nil ((vbuffer-or-name buffer-or-name)
			 (vaction action)
			 (vquit-function quit-function))
      `(let* ((,buffer (temp-buffer-window-setup ,vbuffer-or-name))
	      (standard-output ,buffer)
	      ,window ,value)
	 (setq ,value (progn ,@body))
	 (with-current-buffer ,buffer
	   (setq ,window (temp-buffer-window-show ,buffer ,vaction)))

	 (if (functionp ,vquit-function)
	     (funcall ,vquit-function ,window ,value)
	   ,value)))))

(defmacro with-current-buffer-window (buffer-or-name action quit-function &rest body)
  "Evaluate BODY with a buffer BUFFER-OR-NAME current and show that buffer.
This construct is like `with-temp-buffer-window' but unlike that,
makes the buffer specified by BUFFER-OR-NAME current for running
BODY."
  (declare (debug t) (indent 3))
  (let ((buffer (make-symbol "buffer"))
	(window (make-symbol "window"))
	(value (make-symbol "value")))
    (macroexp-let2* nil ((vbuffer-or-name buffer-or-name)
			 (vaction action)
			 (vquit-function quit-function))
      `(let* ((,buffer (temp-buffer-window-setup ,vbuffer-or-name))
	      (standard-output ,buffer)
	      ,window ,value)
	 (with-current-buffer ,buffer
	   (setq ,value (progn ,@body))
	   (setq ,window (temp-buffer-window-show ,buffer ,vaction)))

	 (if (functionp ,vquit-function)
	     (funcall ,vquit-function ,window ,value)
	   ,value)))))

(defmacro with-displayed-buffer-window (buffer-or-name action quit-function &rest body)
  "Show a buffer BUFFER-OR-NAME and evaluate BODY in that buffer.
This construct is like `with-current-buffer-window' but unlike that,
displays the buffer specified by BUFFER-OR-NAME before running BODY."
  (declare (debug t) (indent 3)
           (obsolete "use `with-current-buffer-window' with action alist entry `body-function'."
                     "28.1"))
  (let ((buffer (make-symbol "buffer"))
	(window (make-symbol "window"))
	(value (make-symbol "value")))
    (macroexp-let2* nil ((vbuffer-or-name buffer-or-name)
			 (vaction action)
			 (vquit-function quit-function))
      `(let* ((,buffer (temp-buffer-window-setup ,vbuffer-or-name))
	      (standard-output ,buffer)
              ;; If a 'window-height' entry specifies a function,
              ;; remember it here in order to call it below but replace
              ;; the entry so `window--try-to-split-window' will bind
              ;; `window-combination-limit' to t and the function does
              ;; not resize any other window but the one we split this
              ;; one off (Bug#25055, Bug#25179).
              (vheight-function
               (let ((window-height (assq 'window-height (cdr ,vaction))))
                 (when (functionp (cdr window-height))
                   (cdr window-height))))
              (vaction-copied
               (when vheight-function
                 (cons (car , vaction)
                       (cons
                        '(window-height . t)
                        (assq-delete-all
                         'window-height (cdr (copy-sequence ,vaction)))))))
	      ,window ,value)
	 (with-current-buffer ,buffer
	   (setq ,window (temp-buffer-window-show
                          ,buffer (or vaction-copied ,vaction))))

	 (let ((inhibit-read-only t)
	       (inhibit-modification-hooks t))
	   (setq ,value (progn ,@body)))

	 (set-window-point ,window (point-min))

	 (when vheight-function
	   (ignore-errors
	     (set-window-parameter ,window 'preserve-size nil)
             (funcall vheight-function ,window)))

	 (when (consp (cdr (assq 'preserve-size (cdr ,vaction))))
	   (window-preserve-size
	    ,window t (cadr (assq 'preserve-size (cdr ,vaction))))
	  (window-preserve-size
	    ,window nil (cddr (assq 'preserve-size (cdr ,vaction)))))

	 (if (functionp ,vquit-function)
	     (funcall ,vquit-function ,window ,value)
	   ,value)))))

(defmacro with-window-non-dedicated (window &rest body)
  "Evaluate BODY with WINDOW temporarily made non-dedicated.
If WINDOW is nil, use the selected window.  Return the value of
the last form in BODY."
  (declare (indent 1) (debug t))
  (let ((window-dedicated-sym (gensym))
        (window-sym (gensym)))
    `(let* ((,window-sym (window-normalize-window ,window t))
            (,window-dedicated-sym (window-dedicated-p ,window-sym)))
       (set-window-dedicated-p ,window-sym nil)
       (unwind-protect
           (progn ,@body)
         ;; `window-dedicated-p' returns the value set by
         ;; `set-window-dedicated-p', which differentiates non-nil and
         ;; t, so we cannot simply use t here. That's why we use
         ;; `window-dedicated-sym'.
         (set-window-dedicated-p ,window-sym ,window-dedicated-sym)))))

;; The following two functions are like `window-next-sibling' and
;; `window-prev-sibling' but the WINDOW argument is _not_ optional (so
;; they don't substitute the selected window for nil), and they return
;; nil when WINDOW doesn't have a parent (like a frame's root window or
;; a minibuffer window).
(defun window-right (window)
  "Return WINDOW's right sibling.
Return nil if WINDOW is the root window of its frame.  WINDOW can
be any window."
  (and window (window-parent window) (window-next-sibling window)))

(defun window-left (window)
  "Return WINDOW's left sibling.
Return nil if WINDOW is the root window of its frame.  WINDOW can
be any window."
  (and window (window-parent window) (window-prev-sibling window)))

(defun window-child (window)
  "Return WINDOW's first child window.
WINDOW can be any window."
  (or (window-top-child window) (window-left-child window)))

(defun window-child-count (window)
  "Return number of WINDOW's child windows.
WINDOW can be any window."
  (let ((count 0))
    (when (and (windowp window) (setq window (window-child window)))
      (while window
	(setq count (1+ count))
	(setq window (window-next-sibling window))))
    count))

(defun window-last-child (window)
  "Return last child window of WINDOW.
WINDOW can be any window."
  (when (and (windowp window) (setq window (window-child window)))
    (while (window-next-sibling window)
      (setq window (window-next-sibling window))))
  window)

(defun window-normalize-buffer (buffer-or-name)
  "Return buffer specified by BUFFER-OR-NAME.
BUFFER-OR-NAME must be a live buffer, a string naming a live
buffer or nil which means to return the current buffer.

This function is commonly used to process the (usually optional)
\"BUFFER-OR-NAME\" argument of window related functions where nil
stands for the current buffer."
  (let ((buffer
         (cond
          ((not buffer-or-name)
           (current-buffer))
          ((bufferp buffer-or-name)
           buffer-or-name)
          ((stringp buffer-or-name)
           (get-buffer buffer-or-name))
          (t
           (error "No such buffer %s" buffer-or-name)))))
    (if (buffer-live-p buffer)
	buffer
      (error "No such live buffer %s" buffer-or-name))))

(defun window-normalize-frame (frame)
  "Return frame specified by FRAME.
FRAME must be a live frame or nil which means to return the
selected frame.

This function is commonly used to process the (usually optional)
\"FRAME\" argument of window and frame related functions where
nil stands for the selected frame."
  (if frame
      (if (frame-live-p frame)
	  frame
	(error "%s is not a live frame" frame))
    (selected-frame)))

(defun window-normalize-window (window &optional live-only)
  "Return window specified by WINDOW.
If WINDOW is nil, return the selected window.  Otherwise, if
WINDOW is a live or an internal window, return WINDOW; if
LIVE-ONLY is non-nil, return WINDOW for a live window only.
Otherwise, signal an error.

This function is commonly used to process the (usually optional)
\"WINDOW\" argument of window related functions where nil stands
for the selected window."
  (cond
   ((null window)
    (selected-window))
   (live-only
    (if (window-live-p window)
	window
      (error "%s is not a live window" window)))
   ((window-valid-p window)
    window)
   (t
    (error "%s is not a valid window" window))))

;; Maybe this should go to frame.el.
(defun frame-char-size (&optional window-or-frame horizontal)
  "Return the value of `frame-char-height' for WINDOW-OR-FRAME.
If WINDOW-OR-FRAME is a live frame, return the value of
`frame-char-height' for that frame.  If WINDOW-OR-FRAME is a
valid window, return the value of `frame-char-height' for that
window's frame.  In any other case, return the value of
`frame-char-height' for the selected frame.

Optional argument HORIZONTAL non-nil means to return the value of
`frame-char-width' for WINDOW-OR-FRAME."
  (let ((frame
	 (cond
	  ((window-valid-p window-or-frame)
	   (window-frame window-or-frame))
	  ((frame-live-p window-or-frame)
	   window-or-frame)
	  (t (selected-frame)))))
    (if horizontal
	(frame-char-width frame)
      (frame-char-height frame))))

(defvar ignore-window-parameters nil
  "If non-nil, standard functions ignore window parameters.
The functions currently affected by this are `split-window',
`delete-window', `delete-other-windows' and `other-window'.

An application may bind this to a non-nil value around calls to
these functions to inhibit processing of window parameters.")

;; This must go to C, finally (or get removed).
(defconst window-safe-min-height 1
  "The absolute minimum number of lines of any window.
Anything less might crash Emacs.")

(defun window-safe-min-pixel-height (&optional window)
  "Return the absolute minimum pixel height of WINDOW."
  (* window-safe-min-height
     (frame-char-size (window-normalize-window window))))

(defcustom window-min-height 4
  "The minimum total height, in lines, of any window.
The value has to accommodate one text line, a mode and header
line, a horizontal scroll bar and a bottom divider, if present.
A value less than `window-safe-min-height' is ignored.  The value
of this variable is honored when windows are resized or split.

Applications should never rebind this variable.  To resize a
window to a height less than the one specified here, an
application should instead call `window-resize' with a non-nil
IGNORE argument.  In order to have `split-window' make a window
shorter, explicitly specify the SIZE argument of that function."
  :type 'integer
  :version "24.1"
  :group 'windows)

(defun window-min-pixel-height (&optional window)
  "Return the minimum pixel height of window WINDOW."
  (* (max (if (window-minibuffer-p window) 1 window-min-height)
          window-safe-min-height)
     (frame-char-size window)))

;; This must go to C, finally (or get removed).
(defconst window-safe-min-width 2
  "The absolute minimum number of columns of a window.
Anything less might crash Emacs.")

(defun window-safe-min-pixel-width (&optional window)
  "Return the absolute minimum pixel width of WINDOW."
  (* window-safe-min-width
     (frame-char-size (window-normalize-window window) t)))

(defcustom window-min-width 10
  "The minimum total width, in columns, of any window.
The value has to accommodate two text columns as well as margins,
fringes, a scroll bar and a right divider, if present.  A value
less than `window-safe-min-width' is ignored.  The value of this
variable is honored when windows are resized or split.

Applications should never rebind this variable.  To resize a
window to a width less than the one specified here, an
application should instead call `window-resize' with a non-nil
IGNORE argument.  In order to have `split-window' make a window
narrower, explicitly specify the SIZE argument of that function."
  :type 'integer
  :version "24.1"
  :group 'windows)

(defun window-min-pixel-width (&optional window)
  "Return the minimum pixel width of window WINDOW."
  (* (max window-min-width window-safe-min-width)
     (frame-char-size window t)))

(defun window-safe-min-pixel-size (&optional window horizontal)
  "Return the absolute minimum pixel height of WINDOW.
Optional argument HORIZONTAL non-nil means return the absolute
minimum pixel width of WINDOW."
  (if horizontal
      (window-safe-min-pixel-width window)
    (window-safe-min-pixel-height window)))

(defun window-min-pixel-size (&optional window horizontal)
  "Return the minimum pixel height of WINDOW.
Optional argument HORIZONTAL non-nil means return the minimum
pixel width of WINDOW."
  (if horizontal
      (window-min-pixel-width window)
    (window-min-pixel-height window)))

(defun window-combined-p (&optional window horizontal)
  "Return non-nil if WINDOW has siblings in a given direction.
WINDOW must be a valid window and defaults to the selected one.

HORIZONTAL determines a direction for the window combination.  If
HORIZONTAL is omitted or nil, return non-nil if WINDOW is part of
a vertical window combination.  If HORIZONTAL is non-nil, return
non-nil if WINDOW is part of a horizontal window combination."
  (setq window (window-normalize-window window))
  (let ((parent (window-parent window)))
    (and parent
	 (if horizontal
	     (window-left-child parent)
	   (window-top-child parent)))))

(defun window-combination-p (&optional window horizontal)
  "Return WINDOW's first child if WINDOW is a vertical combination.
WINDOW can be any window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return WINDOW's first
child if WINDOW is a horizontal combination."
  (setq window (window-normalize-window window))
  (if horizontal
      (window-left-child window)
    (window-top-child window)))

(defun window-combinations (window &optional horizontal ignore-fixed)
  "Return largest number of windows vertically arranged within WINDOW.
WINDOW must be a valid window and defaults to the selected one.
If HORIZONTAL is non-nil, return the largest number of
windows horizontally arranged within WINDOW.

Optional argument IGNORE-FIXED, if non-nil, means to ignore
fixed-size windows in the calculation."
  (setq window (window-normalize-window window))
  (cond
   ((window-live-p window)
    ;; If WINDOW is live, return 1.
    1)
   ((if horizontal
	(window-left-child window)
      (window-top-child window))
    ;; If WINDOW is iso-combined, return the sum of the values for all
    ;; child windows of WINDOW.
    (let ((child (window-child window))
	  (count 0))
      (while child
	(unless (and ignore-fixed (window-size-fixed-p child horizontal))
	  (setq count
		(+ (window-combinations child horizontal ignore-fixed)
		   count)))
	(setq child (window-right child)))
      count))
   (t
    ;; If WINDOW is not iso-combined, return the maximum value of any
    ;; child window of WINDOW.
    (let ((child (window-child window))
	  (count 1))
      (while child
	(unless (and ignore-fixed (window-size-fixed-p child horizontal))
	  (setq count
		(max (window-combinations child horizontal ignore-fixed)
		     count)))
	(setq child (window-right child)))
      count))))

(defun walk-window-tree-1 (fun walk-window-tree-window any &optional sub-only)
  "Helper function for `walk-window-tree' and `walk-window-subtree'."
  (let (walk-window-tree-buffer)
    (while walk-window-tree-window
      (setq walk-window-tree-buffer
	    (window-buffer walk-window-tree-window))
      (when (or walk-window-tree-buffer any)
	(funcall fun walk-window-tree-window))
      (unless walk-window-tree-buffer
	(walk-window-tree-1
	 fun (window-left-child walk-window-tree-window) any)
	(walk-window-tree-1
	 fun (window-top-child walk-window-tree-window) any))
      (if sub-only
	  (setq walk-window-tree-window nil)
	(setq walk-window-tree-window
	      (window-right walk-window-tree-window))))))

(defun walk-window-tree (fun &optional frame any minibuf)
  "Run function FUN on each live window of FRAME.
FUN must be a function with one argument - a window.  FRAME must
be a live frame and defaults to the selected one.  ANY, if
non-nil, means to run FUN on all live and internal windows of
FRAME.

Optional argument MINIBUF t means run FUN on FRAME's minibuffer
window even if it isn't active.  MINIBUF nil or omitted means run
FUN on FRAME's minibuffer window only if it's active.  In either
case the minibuffer window must be part of FRAME.  MINIBUF
neither nil nor t means never run FUN on the minibuffer window.

This function performs a pre-order, depth-first traversal of the
window tree.  If FUN changes the window tree, the result is
unpredictable."
  (let ((root (frame-root-window frame))
        (mini (minibuffer-window frame)))
    (setq frame (window-normalize-frame frame))
    (unless (eq root mini)
      (walk-window-tree-1 fun root any))
    ;; Run FUN on FRAME's minibuffer window if requested.
    (when (and (window-live-p mini)
	       (eq (window-frame mini) frame)
	       (or (eq minibuf t)
		   (and (not minibuf)
                        (minibuffer-window-active-p mini))))
	(funcall fun mini))))

(defun walk-window-subtree (fun &optional window any)
  "Run function FUN on the subtree of windows rooted at WINDOW.
WINDOW defaults to the selected window.  FUN must be a function
with one argument - a window.  By default, run FUN only on live
windows of the subtree.  If the optional argument ANY is non-nil,
run FUN on all live and internal windows of the subtree.  If
WINDOW is live, run FUN on WINDOW only.

This function performs a pre-order, depth-first traversal of the
subtree rooted at WINDOW.  If FUN changes that tree, the result
is unpredictable."
  (setq window (window-normalize-window window))
  (walk-window-tree-1 fun window any t))

(defun window-with-parameter (parameter &optional value frame any minibuf)
  "Return first window on FRAME with PARAMETER non-nil.
FRAME defaults to the selected frame.  Optional argument VALUE
non-nil means only return a window whose window-parameter value
for PARAMETER equals VALUE (comparison is done with `equal').
Optional argument ANY non-nil means consider internal windows
too.

Optional argument MINIBUF t means consider FRAME's minibuffer
window even if it isn't active.  MINIBUF nil or omitted means
consider FRAME's minibuffer window only if it's active.  In both
cases the minibuffer window must be part of FRAME.  MINIBUF
neither nil nor t means never consider the minibuffer window."
  (let (this-value)
    (catch 'found
      (walk-window-tree
       (lambda (window)
	 (when (and (setq this-value (window-parameter window parameter))
		    (or (not value) (equal value this-value)))
	   (throw 'found window)))
       frame any minibuf))))

;;; Atomic windows.
(defun window-atom-root (&optional window)
  "Return root of atomic window WINDOW is a part of.
WINDOW must be a valid window and defaults to the selected one.
Return nil if WINDOW is not part of an atomic window."
  (setq window (window-normalize-window window))
  (let (root)
    (while (and window (window-parameter window 'window-atom))
      (setq root window)
      (setq window (window-parent window)))
    root))

(defun window-make-atom (window)
  "Make WINDOW an atomic window.
WINDOW must be an internal window.  Return WINDOW."
  (if (not (window-child window))
      (error "Window %s is not an internal window" window)
    (walk-window-subtree
     (lambda (window)
       (unless (window-parameter window 'window-atom)
	 (set-window-parameter window 'window-atom t)))
     window t)
    window))

(defun display-buffer-in-atom-window (buffer alist)
  "Display BUFFER in an atomic window.
This function displays BUFFER in a new window that will be
combined with an existing window to form an atomic window.  If
the existing window is already part of an atomic window, add the
new window to that atomic window.  Operations like `split-window'
or `delete-window', when applied to a constituent of an atomic
window, are applied atomically to the root of that atomic window.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.  The following two symbols have a special meaning:

`window' specifies the existing window the new window shall be
  combined with.  Use `window-atom-root' to make the new window a
  sibling of an atomic window's root.  If an internal window is
  specified here, all children of that window become part of the
  atomic window too.  If no window is specified, the new window
  becomes a sibling of the selected window.  By default, the
  `window-atom' parameter of the existing window is set to `main'
  provided the window is live and the parameter is not set yet.

`side' denotes the side of the existing window where the new
  window shall be located.  Valid values are `below', `right',
  `above' and `left'.  The default is `below'.  By default, the
  `window-atom' parameter of the new window is set to this value.

The return value is the new window, nil when creating that window
failed.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((ignore-window-parameters t)
	 (window-combination-limit t)
	 (window-combination-resize 'atom)
	 (window (cdr (assq 'window alist)))
	 (side (or (cdr (assq 'side alist)) 'below))
	 (atom (when window (window-parameter window 'window-atom)))
	 root new)
    (setq window (window-normalize-window window))
    (setq root (window-atom-root window))
    ;; Split off new window.
    (when (setq new (split-window-no-error window nil side))
      (window-make-atom
       (if (and root (not (eq root window)))
	   ;; When WINDOW was part of an atomic window and we did not
	   ;; split its root, root atomic window at old root.
	   root
	 ;; Otherwise, root atomic window at WINDOW's new parent.
	 (window-parent window)))
      ;; Assign `window-atom' parameters, if needed.
      (when (and (not atom) (window-live-p window))
	(set-window-parameter window 'window-atom 'main))
      (set-window-parameter new 'window-atom side)
      ;; Display BUFFER in NEW and return NEW.
      (window--display-buffer buffer new 'window alist))))

(defun window--atom-check-1 (window)
  "Subroutine of `window--atom-check'."
  (when window
    (if (window-parameter window 'window-atom)
	(let ((count 0))
	  (when (or (catch 'reset
		      (walk-window-subtree
		       (lambda (window)
			 (if (window-parameter window 'window-atom)
			     (setq count (1+ count))
			   (throw 'reset t)))
		       window t))
		    ;; count >= 1 must hold here.  If there's no other
		    ;; window around dissolve this atomic window.
		    (= count 1))
	    ;; Dissolve atomic window.
	    (walk-window-subtree
	     (lambda (window)
	       (set-window-parameter window 'window-atom nil))
	     window t)))
      ;; Check children.
      (unless (window-buffer window)
	(window--atom-check-1 (window-left-child window))
	(window--atom-check-1 (window-top-child window))))
    ;; Check right sibling
    (window--atom-check-1 (window-right window))))

(defun window--atom-check (&optional frame)
  "Check atomicity of all windows on FRAME.
FRAME defaults to the selected frame.  If an atomic window is
wrongly configured, reset the atomicity of all its windows on
FRAME to nil.  An atomic window is wrongly configured if it has
no child windows or one of its child windows is not atomic."
  (window--atom-check-1 (frame-root-window frame)))

;; Side windows.
(defcustom window-sides-vertical nil
  "If non-nil, left and right side windows occupy full frame height.
If nil, top and bottom side windows occupy full frame width."
  :type 'boolean
  :initialize 'custom-initialize-default
  :set 'window--sides-verticalize
  :group 'windows
  :version "26.1")

(defcustom window-sides-reversed nil
  "Whether top/bottom side windows appear in reverse order.
When this is nil, side windows on the top and bottom of a frame
are always drawn from left to right with increasing slot values.
When this is t, side windows on the top and bottom of a frame are
always drawn from right to left with increasing slot values.

When this is `bidi', the drawing order is like that for the value
t if the value of `bidi-paragraph-direction' is `right-to-left'
in the buffer most recently shown in the window selected within
the main window area of this frame.

The layout of side windows on the left or right of a frame is not
affected by the value of this variable."
  :type
  '(choice (const :tag "Never" nil)
	   (const :tag "Bidi" bidi)
	   (const :tag "Always" t))
  :initialize 'custom-initialize-default
  :set 'window--sides-reverse
  :group 'windows
  :version "26.1")

(defcustom window-sides-slots '(nil nil nil nil)
  "Number of available side window slots on each side of a frame.
The value is a list of four elements specifying the maximum
number of side windows that may be created on the left, top,
right and bottom side of any frame.

If an element is a number, `display-buffer-in-side-window' will
refrain from making a new side window if the number of windows on
that side is equal to or exceeds that number.  Rather, it will
reuse the window whose `window-slot' value is nearest to the slot
specified via its ALIST argument.  If an element is nil, this
means there's no bound on the number of windows on that side."
  :version "24.1"
  :risky t
  :type
  '(list
    :value (nil nil nil nil)
    (choice
     :tag "Left"
     :help-echo "Maximum number of left side windows."
     :value nil
     :format "%[Left%] %v\n"
     (const :tag "Unlimited" :format "%t" nil)
     (integer :tag "Number" :value 2 :size 5))
    (choice
     :tag "Top"
     :help-echo "Maximum number of top side windows."
     :value nil
     :format "%[Top%] %v\n"
     (const :tag "Unlimited" :format "%t" nil)
     (integer :tag "Number" :value 3 :size 5))
    (choice
     :tag "Right"
     :help-echo "Maximum number of right side windows."
     :value nil
     :format "%[Right%] %v\n"
     (const :tag "Unlimited" :format "%t" nil)
     (integer :tag "Number" :value 2 :size 5))
    (choice
     :tag "Bottom"
     :help-echo "Maximum number of bottom side windows."
     :value nil
     :format "%[Bottom%] %v\n"
     (const :tag "Unlimited" :format "%t" nil)
     (integer :tag "Number" :value 3 :size 5)))
  :group 'windows)

(defvar-local window--sides-shown nil
  "Non-nil if this buffer was shown in a side window once.
If this variable is non-nil in a buffer, `switch-to-prev-buffer'
and `switch-to-next-buffer' will refrain from showing this buffer
within the main window area.  `display-buffer-in-side-window'
sets this variable automatically.

Killing buffer local variables after showing the buffer in a side
window annihilates any effect provided by this variable.")

(defvar window--sides-inhibit-check nil
  "Non-nil means inhibit any checks on side windows.")

(defun window--sides-reverse-on-frame-p (frame)
  "Return non-nil when side windows should appear reversed on FRAME.
This uses some heuristics to guess the user's intentions when the
selected window of FRAME is a side window ."
  (cond
   ;; Reverse when `window-sides-reversed' is t.  Do not reverse when
   ;; `window-sides-reversed' is nil.
   ((memq window-sides-reversed '(nil t))
    window-sides-reversed)
   ;; Reverse when FRAME's selected window shows a right-to-left buffer.
   ((let ((window (frame-selected-window frame)))
      (when (and (not (window-parameter window 'window-side))
                 (or (not (window-minibuffer-p window))
                     (setq window (minibuffer-selected-window))))
        (with-current-buffer (window-buffer window)
          (eq bidi-paragraph-direction 'right-to-left)))))
   ;; Reverse when FRAME's `window-sides-main-selected-window' parameter
   ;; specifies a live window showing a right-to-left buffer.
   ((let ((window (frame-parameter
                   frame 'window-sides-main-selected-window)))
      (when (window-live-p window)
        (with-current-buffer (window-buffer window)
          (eq bidi-paragraph-direction 'right-to-left)))))
   ;; Reverse when all windows in FRAME's main window show right-to-left
   ;; buffers.
   (t
    (catch 'found
      (walk-window-subtree
       (lambda (window)
         (with-current-buffer (window-buffer window)
           (when (eq bidi-paragraph-direction 'left-to-right)
             (throw 'found nil))))
       (window-main-window frame))
      t))))

(defun window-main-window (&optional frame)
  "Return the main window of specified FRAME.
The optional argument FRAME must be a live frame and defaults to
the selected one.

If FRAME has no side windows, return FRAME's root window.
Otherwise, return either an internal non-side window such that
all other non-side windows on FRAME descend from it, or the
single live non-side window of FRAME."
  (let ((frame (window-normalize-frame frame))
	main sibling)
    ;; Set main to the _last_ window found by `walk-window-tree' that
    ;; is not a side window but has a side window as its sibling.
    (walk-window-tree
     (lambda (window)
       (and (not (window-parameter window 'window-side))
	    (or (and (setq sibling (window-prev-sibling window))
		     (window-parameter sibling 'window-side))
		(and (setq sibling (window-next-sibling window))
		     (window-parameter sibling 'window-side)))
	    (setq main window)))
     frame t 'nomini)
    (or main (frame-root-window frame))))

(defun window--make-major-side-window-next-to (side)
  "Return window to split for making a major side window.
SIDE must be one of the symbols `left', `top', `right' or
`bottom'.

This is an auxiliary function of `window--make-major-side-window'
and must not be called when a window on SIDE exists already."
  (let ((root (frame-root-window))
        (window--sides-inhibit-check t)
        window)
    ;; (1) If a window on the opposite side exists, return that window's
    ;;     sibling.
    ;; (2) If the new window shall span the entire side, return the
    ;;     frame's root window.
    ;; (3) If a window on an orthogonal side exists, return that
    ;;     window's sibling.
    ;; (4) Otherwise return the frame's root window.
    (cond
     ((or (and (eq side 'left)
	       (setq window (window-with-parameter 'window-side 'right nil t)))
	  (and (eq side 'top)
	       (setq window (window-with-parameter 'window-side 'bottom nil t))))
      (window-prev-sibling window))
     ((or (and (eq side 'right)
	       (setq window (window-with-parameter 'window-side 'left nil t)))
	  (and (eq side 'bottom)
	       (setq window (window-with-parameter 'window-side 'top nil t))))
      (window-next-sibling window))
     ((memq side '(left right))
      (cond
       (window-sides-vertical
	root)
       ((setq window (window-with-parameter 'window-side 'top nil t))
	(window-next-sibling window))
       ((setq window (window-with-parameter 'window-side 'bottom nil t))
	(window-prev-sibling window))
       (t root)))
     ((memq side '(top bottom))
      (cond
       ((not window-sides-vertical)
	root)
       ((setq window (window-with-parameter 'window-side 'left nil t))
	(window-next-sibling window))
       ((setq window (window-with-parameter 'window-side 'right nil t))
	(window-prev-sibling window))
       (t root))))))

(defun window--make-major-side-window (buffer side slot &optional alist)
  "Display BUFFER in a new major side window on the selected frame.
SIDE must be one of `left', `top', `right' or `bottom'.  SLOT
specifies the slot to use.  ALIST is an association list of
symbols and values as passed to `display-buffer-in-side-window'.
Return the new window, nil if its creation failed.

This is an auxiliary function of `display-buffer-in-side-window'
and may be called only if no window on SIDE exists yet."
  (let* ((left-or-right (memq side '(left right)))
	 (next-to (window--make-major-side-window-next-to side))
	 (on-side (cond
		   ((eq side 'top) 'above)
		   ((eq side 'bottom) 'below)
		   (t side)))
         (window--sides-inhibit-check t)
	 ;; The following two bindings will tell `split-window' to take
	 ;; the space for the new window from the selected frame's main
	 ;; window and not make a new parent window unless needed.
	 (window-combination-resize 'side)
	 (window-combination-limit nil)
	 (window (split-window-no-error next-to nil on-side))
         (alist (if (assq 'dedicated alist)
                    alist
                  (cons `(dedicated . ,(or display-buffer-mark-dedicated 'side))
                        alist))))
    (when window
      ;; Initialize `window-side' parameter of new window to SIDE and
      ;; make that parameter persistent.
      (set-window-parameter window 'window-side side)
      (add-to-list 'window-persistent-parameters '(window-side . writable))
      ;; Install `window-slot' parameter of new window and make that
      ;; parameter persistent.
      (set-window-parameter window 'window-slot slot)
      (add-to-list 'window-persistent-parameters '(window-slot . writable))
      ;; Auto-adjust height/width of new window unless a size has been
      ;; explicitly requested.
      (unless (if left-or-right
		  (cdr (assq 'window-width alist))
		(cdr (assq 'window-height alist)))
	(setq alist
	      (cons
	       (cons
		(if left-or-right 'window-width 'window-height)
		(/ (window-total-size (frame-root-window) left-or-right)
		   ;; By default use a fourth of the size of the frame's
		   ;; root window.
		   4))
	       alist)))
      (with-current-buffer buffer
        (setq window--sides-shown t))
      ;; Install BUFFER in new window and return WINDOW.
      (window--display-buffer buffer window 'window alist))))

(defun display-buffer-in-side-window (buffer alist)
  "Display BUFFER in a side window of the selected frame.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.  The following two symbols, when used in ALIST, have
a special meaning:

 `side' denotes the side of the frame where the new window shall
   be located.  Valid values are `bottom', `right', `top' and
   `left'.  The default is `bottom'.

 `slot' if non-nil, specifies the window slot where to display
   BUFFER.  A value of zero or nil means use the middle slot on
   the specified side.  A negative value means use a slot
   preceding (that is, above or on the left of) the middle slot.
   A positive value means use a slot following (that is, below or
   on the right of) the middle slot.  The default is zero.

If the current frame size or the settings of `window-sides-slots'
do not permit making a new window, a suitable existing window may
be reused and have its `window-slot' parameter value accordingly
modified.

Unless `display-buffer-mark-dedicated' is non-nil, dedicate the
side window used to BUFFER so that it does not get reused by
other `display-buffer' action functions.  Return the window used
for displaying BUFFER, nil if no suitable window can be found.

This function installs the `window-side' and `window-slot'
parameters and makes them persistent.  It neither modifies ALIST
nor installs any other window parameters unless they have been
explicitly provided via a `window-parameters' entry in ALIST.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((side (or (cdr (assq 'side alist)) 'bottom))
         (slot (or (cdr (assq 'slot alist)) 0))
         (left-or-right (memq side '(left right))))
    (cond
     ((not (memq side '(top bottom left right)))
      (error "Invalid side %s specified" side))
     ((not (numberp slot))
      (error "Invalid slot %s specified" slot)))

    (let* ((major (window-with-parameter 'window-side side nil t))
	   ;; `major' is the major window on SIDE, `windows' the list of
	   ;; life windows on SIDE.
           (reversed (window--sides-reverse-on-frame-p (selected-frame)))
           (windows
	    (cond
             ((window-live-p major)
              (list major))
             ((window-valid-p major)
              (let* ((first (window-child major))
                     (next (window-next-sibling first))
                     (windows (list next first)))
                (setq reversed (> (window-parameter first 'window-slot)
                                  (window-parameter next 'window-slot)))
		(while (setq next (window-next-sibling next))
                  (setq windows (cons next windows)))
		(if reversed windows (nreverse windows))))))
	   (slots (when major (max 1 (window-child-count major))))
	   (max-slots
	    (nth (cond
		  ((eq side 'left) 0)
		  ((eq side 'top) 1)
		  ((eq side 'right) 2)
		  ((eq side 'bottom) 3))
		 window-sides-slots))
           (window--sides-inhibit-check t)
           (alist (if (assq 'dedicated alist)
                      alist
                    (cons `(dedicated . ,(or display-buffer-mark-dedicated 'side))
                          alist)))
           window this-window this-slot prev-window next-window
	   best-window best-slot abs-slot)

      (cond
       ((and (numberp max-slots) (<= max-slots 0))
	;; No side-slots available on this side.  Don't raise an error,
	;; just return nil.
	nil)
       ((not windows)
	;; No major side window exists on this side, make one.
	(window--make-major-side-window buffer side slot alist))
       (t
	;; Scan windows on SIDE.
	(catch 'found
	  (dolist (window windows)
	    (setq this-slot (window-parameter window 'window-slot))
	    (cond
	     ;; The following should not happen and probably be checked
	     ;; by window--sides-check.
	     ((not (numberp this-slot)))
	     ((= this-slot slot)
	      ;; A window with a matching slot has been found.
	      (setq this-window window)
	      (throw 'found t))
	     (t
	      ;; Check if this window has a better slot value wrt the
	      ;; slot of the window we want.
	      (setq abs-slot
		    (if (or (and (> this-slot 0) (> slot 0))
			    (and (< this-slot 0) (< slot 0)))
			(abs (- slot this-slot))
		      (+ (abs slot) (abs this-slot))))
	      (unless (and best-slot (<= best-slot abs-slot))
		(setq best-window window)
		(setq best-slot abs-slot))
	      (if reversed
                  (cond
                   ((<= this-slot slot)
                    (setq next-window window))
                   ((not prev-window)
                    (setq prev-window window)))
                (cond
                 ((<= this-slot slot)
                  (setq prev-window window))
                 ((not next-window)
                  (setq next-window window))))))))

        ;; `this-window' is the first window with the same SLOT.
	;; `prev-window' is the window with the largest slot < SLOT.  A new
	;; window will be created after it.
	;; `next-window' is the window with the smallest slot > SLOT.  A new
	;; window will be created before it.
	;; `best-window' is the window with the smallest absolute difference
	;; of its slot and SLOT.
	(or (and this-window
		 ;; Reuse `this-window'.
                 (with-current-buffer buffer
                   (setq window--sides-shown t))
		 (window--display-buffer buffer this-window 'reuse alist))
	    (and (or (not max-slots) (< slots max-slots))
		 (or (and next-window
			  ;; Make new window before `next-window'.
			  (let ((next-side (if left-or-right 'above 'left))
				(window-combination-resize 'side))
			    (setq window (split-window-no-error
                                          next-window nil next-side))))
		     (and prev-window
			  ;; Make new window after `prev-window'.
			  (let ((prev-side (if left-or-right 'below 'right))
				(window-combination-resize 'side))
			    (setq window (split-window-no-error
                                          prev-window nil prev-side)))))
		   (set-window-parameter window 'window-slot slot)
                   (with-current-buffer buffer
                     (setq window--sides-shown t))
		   (window--display-buffer buffer window 'window alist))
	    (and best-window
		 ;; Reuse `best-window'.
		 (progn
		   ;; Give best-window the new slot value.
		   (set-window-parameter best-window 'window-slot slot)
                   (with-current-buffer buffer
                     (setq window--sides-shown t))
                   (window--display-buffer
                    buffer best-window 'reuse alist)))))))))

(defun window-toggle-side-windows (&optional frame)
  "Toggle display of side windows on specified FRAME.
FRAME must be a live frame and defaults to the selected one.

If FRAME has at least one side window, delete all side
windows on FRAME after saving FRAME's state in the
FRAME's `window-state' frame parameter.  Otherwise,
restore any side windows recorded in FRAME's `window-state'
parameter, leaving FRAME's main window alone.  Signal an
error if FRAME has no side windows and no saved state for
it is found."
  (interactive)
  (let* ((frame (window-normalize-frame frame))
         (window--sides-inhibit-check t)
         state)
    (cond
     ((window-with-parameter 'window-side nil frame)
      ;; At least one side window exists.  Remove all side windows after
      ;; saving FRAME's state in its `window-state' parameter.
      (set-frame-parameter
       frame 'window-state (window-state-get (frame-root-window frame)))
      (let ((ignore-window-parameters t))
        (delete-other-windows (window-main-window frame))))
     ((setq state (frame-parameter frame 'window-state))
      ;; A window state was saved for FRAME.  Restore it and put the
      ;; current root window into its main window.
      (let ((main-state (window-state-get (frame-root-window frame))))
        (window-state-put state (frame-root-window frame) t)
        (window-state-put main-state (window-main-window frame)))
      (window--sides-reverse-frame frame))
     (t
      (error "No side windows state found")))))

(defun window--sides-reverse-all ()
  "Maybe reverse side windows on all frames."
  (unless window--sides-inhibit-check
    (dolist (frame (frame-list))
      (window--sides-reverse-frame frame))))

(defun window--sides-reverse-frame (frame)
  "Maybe reverse side windows on FRAME."
  (when (eq window-sides-reversed 'bidi)
    (let ((window (frame-selected-window frame)))
      (unless (or (window-parameter window 'window-side)
                  (window-minibuffer-p window))
        (set-frame-parameter
         frame 'window-sides-main-selected-window window))))
  (window--sides-reverse-side frame 'top)
  (window--sides-reverse-side frame 'bottom))

(defun window--sides-reverse-side (frame side)
  "Maybe reverse windows on SIDE of FRAME."
  (let ((major (window-with-parameter 'window-side side frame t))
        (window--sides-inhibit-check t))
    (when (and major (not (window-live-p major)))
      (let* ((first (window-child major))
             (reversed (> (window-parameter first 'window-slot)
                          (window-parameter
                           (window-next-sibling first) 'window-slot)))
             (reverse (window--sides-reverse-on-frame-p frame)))
        (unless (eq reversed reverse)
          ;; We have to reverse.
          (let ((last (window-last-child major)))
            (while (and (not (eq first last))
                        (not (eq first (window-next-sibling last))))
              (window-swap-states first last t)
              (setq first (window-next-sibling first))
              (setq last (window-prev-sibling last)))))))))

(defun window--sides-reverse (symbol value)
  "Helper function for customizing `window-sides-reversed'."
  (set-default symbol value)
  (remove-hook 'buffer-list-update-hook 'window--sides-reverse-all)
  (remove-hook 'window-configuration-change-hook 'window--sides-reverse-all)
  (dolist (frame (frame-list))
    (set-frame-parameter frame 'window-sides-main-selected-window nil))
  (when (eq value 'bidi)
    (add-hook 'buffer-list-update-hook 'window--sides-reverse-all)
    (add-hook 'window-configuration-change-hook 'window--sides-reverse-all))
  (window--sides-reverse-all))

(defun window--sides-verticalize-frame (&optional frame)
  "Maybe change side windows layout on specified FRAME."
  (setq frame (window-normalize-frame frame))
  (let ((window--sides-inhibit-check t)
        (root (frame-root-window frame))
	(main (window-main-window frame)))
    (when (and (not (eq main root))
	       (not (eq (window-parent main) root))
	       (window-combined-p main window-sides-vertical))
      (let* ((window--sides-inhibit-check t)
	     (ignore-window-parameters t)
	     (first (window-child root))
	     (first-state
	      (and first (window-parameter first 'window-side)
		   (window-state-get first)))
	     (last (window-last-child root))
	     (last-state
	      (and last (window-parameter last 'window-side)
		   (window-state-get last)))
	     (dummy (get-buffer-create " *dummy*"))
	     major)
	(unwind-protect
	    (progn
	      (when first-state (delete-window first))
	      (when last-state (delete-window last))
	      (when first-state
		(setq major (window--make-major-side-window
			     dummy (if window-sides-vertical 'top 'left) 0))
		(window-state-put first-state major t))
	      (when last-state
		(setq major (window--make-major-side-window
			     dummy (if window-sides-vertical 'bottom 'right) 0))
		(window-state-put last-state major t)))
	  (kill-buffer " *dummy*"))))))

(defun window--sides-verticalize (symbol value)
  "Helper function for customizing `window-sides-vertical'."
  (set-default symbol value)
  (dolist (frame (frame-list))
    (window--sides-verticalize-frame frame)))

(defun window--sides-check-failed (frame)
  "Helper function for `window--sides-check'."
  (catch 'failed
    ;; FRAME must have a main window.
    (unless (window-main-window frame)
      (error "Frame %s has no main window" frame)
      (throw 'failed t))
    ;; Now check the side windows.
    (dolist (side '(left top right bottom))
      (let ((window (window-with-parameter 'window-side side frame t)))
        (when window
          ;; If WINDOW is live there must be no other window on this frame
          ;; with the same `window-side' parameter.
          (if (window-live-p window)
              (walk-window-tree
               (lambda (this)
                 (when (and (eq (window-parameter this 'window-side) side)
                            (not (eq this window)))
                   (error "Window %s has same side %s as window %s but no common parent"
                          this side window)
                   (throw 'failed t)))
               frame t 'nomini)
            (walk-window-tree
             (lambda (this)
               (if (eq (window-parent this) window)
                   (unless (eq (window-parameter this 'window-side) side)
                     (error "Window %s has not same side %s as its parent %s"
                            this side window)
                     (throw 'failed t))
                 (when (and (eq (window-parameter this 'window-side) side)
                            (not (eq this window)))
                   (error "Window %s has same side %s as major side window %s but its parent is %s"
                          this side window (window-parent this))
                   (throw 'failed t))))
             frame t 'nomini)))))))

(defun window--sides-check (frame)
  "Check side windows configuration of FRAME.
In a valid side windows configuration there can be at most one
internal side window on each side and all its children must be
live and have the same `window-side' parameter and no other
window with the same `window-side' parameter exists on FRAME.  If
there is no such internal window, there may be at most one window
with this side's `window-side' parameter on FRAME.

If the configuration is invalid, reset the `window-side'
parameters of all windows on FRAME."
  (when (and (not window--sides-inhibit-check)
             (window-with-parameter 'window-side nil frame t)
             (window--sides-check-failed frame))
    ;; Reset all `window-side' parameters.
    (walk-window-tree
     (lambda (window)
       (set-window-parameter window 'window-side nil))
     frame t 'nomini)
    (message "Side windows configuration reset for frame %s" frame)))

(defun window--check (&optional frame)
  "Check atomic and side windows on FRAME.
FRAME defaults to the selected frame."
  (window--sides-check frame)
  (window--atom-check frame))

;; Dumping frame/window contents.
(defun window--dump-window (&optional window erase)
  "Dump WINDOW to buffer *window-frame-dump*.
WINDOW must be a valid window and defaults to the selected one.
Optional argument ERASE non-nil means erase *window-frame-dump*
before writing to it."
  (setq window (window-normalize-window window))
  (with-current-buffer (get-buffer-create "*window-frame-dump*")
    (when erase (erase-buffer))
    (insert
     (format "%s   parent: %s\n" window (window-parent window))
     (format "pixel left: %s   top: %s   size: %s x %s   new: %s\n"
	     (window-pixel-left window) (window-pixel-top window)
	     (window-size window t t) (window-size window nil t)
	     (window-new-pixel window))
     (format "char left: %s   top: %s   size: %s x %s   new: %s\n"
	     (window-left-column window) (window-top-line window)
	     (window-total-size window t) (window-total-size window)
	     (window-new-total window))
     (format "normal: %s x %s   new: %s\n"
	     (window-normal-size window t) (window-normal-size window)
	     (window-new-normal window)))
    (when (window-live-p window)
      (let ((fringes (window-fringes window))
	    (margins (window-margins window)))
	(insert
	 (format "body pixel: %s x %s   char: %s x %s\n"
		 (window-body-width window t) (window-body-height window t)
		 (window-body-width window) (window-body-height window))
	 (format "width left fringe: %s  left margin: %s  right margin: %s\n"
		 (car fringes) (or (car margins) 0) (or (cdr margins) 0))
	 (format "width right fringe: %s  scroll-bar: %s  divider: %s\n"
		 (cadr fringes)
		 (window-scroll-bar-width window)
		 (window-right-divider-width window))
	 (format "height header-line: %s  mode-line: %s  divider: %s\n"
		 (window-header-line-height window)
		 (window-mode-line-height window)
		 (window-bottom-divider-width window)))))
    (insert "\n")))

(defun window--dump-frame (&optional window-or-frame)
  "Dump WINDOW-OR-FRAME to buffer *window-frame-dump*.
WINDOW-OR-FRAME can be a frame or a window and defaults to the
selected frame.  When WINDOW-OR-FRAME is a window, dump that
window's frame.  The buffer *window-frame-dump* is erased before
dumping to it."
  (let* ((window
	  (cond
	   ((or (not window-or-frame)
		(frame-live-p window-or-frame))
	    (frame-root-window window-or-frame))
	   ((or (window-live-p window-or-frame)
		(window-child window-or-frame))
	    window-or-frame)
	   (t
	    (frame-root-window))))
	 (frame (window-frame window)))
    (with-current-buffer (get-buffer-create "*window-frame-dump*")
      (erase-buffer)
      (insert
       (format "frame pixel: %s x %s   cols/lines: %s x %s   units: %s x %s\n"
	       (frame-pixel-width frame) (frame-pixel-height frame)
	       (frame-total-cols frame) (frame-total-lines frame)
	       (frame-char-width frame) (frame-char-height frame))
       (format "frame text pixel: %s x %s   cols/lines: %s x %s\n"
	       (frame-text-width frame) (frame-text-height frame)
	       (frame-text-cols frame) (frame-text-lines frame))
       (format "tab: %s  tool: %s  scroll: %s/%s  fringe: %s  border: %s  right: %s  bottom: %s\n\n"
	       (if (fboundp 'tab-bar-height)
		   (tab-bar-height frame t)
		 "0")
	       (if (fboundp 'tool-bar-height)
		   (tool-bar-height frame t)
		 "0")
	       (frame-scroll-bar-width frame)
	       (frame-scroll-bar-height frame)
	       (frame-fringe-width frame)
	       (frame-border-width frame)
	       (frame-right-divider-width frame)
	       (frame-bottom-divider-width frame)))
      (walk-window-tree 'window--dump-window frame t t))))

;;; Window sizes.
(defun window-total-size (&optional window horizontal round)
  "Return the total height or width of WINDOW.
WINDOW must be a valid window and defaults to the selected one.

If HORIZONTAL is omitted or nil, return the total height of
WINDOW, in lines.  If WINDOW is live, its total height includes,
in addition to the height of WINDOW's text, the heights of
WINDOW's mode and header line and a bottom divider, if any.

If HORIZONTAL is non-nil, return the total width of WINDOW, in
columns.  If WINDOW is live, its total width includes, in
addition to the width of WINDOW's text, the widths of WINDOW's
fringes, margins, scroll bars and its right divider, if any.

If WINDOW is internal, return the respective size of the screen
areas spanned by its children.

Optional argument ROUND is handled as for `window-total-height'
and `window-total-width'."
  (if horizontal
      (window-total-width window round)
    (window-total-height window round)))

(defun window-size (&optional window horizontal pixelwise round)
  "Return the height or width of WINDOW.
WINDOW must be a valid window and defaults to the selected one.

If HORIZONTAL is omitted or nil, return the total height of
WINDOW, in lines, like `window-total-height'.  Otherwise return
the total width, in columns, like `window-total-width'.

Optional argument PIXELWISE means return the pixel size of WINDOW
like `window-pixel-height' and `window-pixel-width'.

Optional argument ROUND is ignored if PIXELWISE is non-nil and
handled as for `window-total-height' and `window-total-width'
otherwise."
  (if horizontal
      (if pixelwise
	  (window-pixel-width window)
	(window-total-width window round))
    (if pixelwise
	(window-pixel-height window)
      (window-total-height window round))))

(defvar-local window-size-fixed nil
  "Non-nil in a buffer means windows displaying the buffer are fixed-size.
If the value is `height', then only the window's height is fixed.
If the value is `width', then only the window's width is fixed.
Any other non-nil value fixes both the width and the height.

Emacs won't change the size of any window displaying that buffer,
unless it has no other choice (like when deleting a neighboring
window).")

(defun window--preservable-size (window &optional horizontal)
  "Return height of WINDOW as `window-preserve-size' would preserve it.
Optional argument HORIZONTAL non-nil means to return the width of
WINDOW as `window-preserve-size' would preserve it."
  (if horizontal
      (window-body-width window t)
    (+ (window-body-height window t)
       (window-header-line-height window)
       (window-mode-line-height window))))

(defun window-preserve-size (&optional window horizontal preserve)
  "Preserve height of window WINDOW.
WINDOW must be a live window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means preserve the width of
WINDOW.

PRESERVE t means to preserve the current height/width of WINDOW's
body in frame and window resizing operations whenever possible.
The height/width of WINDOW will change only if Emacs has no other
choice.  Resizing a window whose height/width is preserved never
throws an error.

PRESERVE nil means to stop preserving the height/width of WINDOW,
lifting the respective restraint induced by a previous call of
`window-preserve-size' for WINDOW.  Calling `enlarge-window',
`shrink-window', `split-window' or `fit-window-to-buffer' with
WINDOW as argument also removes the respective restraint.

Other values of PRESERVE are reserved for future use."
  (setq window (window-normalize-window window t))
  (let* ((parameter (window-parameter window 'window-preserved-size))
	 (width (nth 1 parameter))
	 (height (nth 2 parameter)))
    (if horizontal
	(set-window-parameter
	 window 'window-preserved-size
	 (list
	  (window-buffer window)
	  (and preserve (window--preservable-size window t))
	  height))
      (set-window-parameter
       window 'window-preserved-size
       (list
	(window-buffer window)
	width
	(and preserve (window--preservable-size window)))))))

(defun window-preserved-size (&optional window horizontal)
  "Return preserved height of window WINDOW.
WINDOW must be a live window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means to return preserved
width of WINDOW."
  (setq window (window-normalize-window window t))
  (let* ((parameter (window-parameter window 'window-preserved-size))
	 (buffer (nth 0 parameter))
	 (width (nth 1 parameter))
	 (height (nth 2 parameter)))
    (when (eq buffer (window-buffer window))
      (if horizontal width height))))

(defun window--preserve-size (window horizontal)
  "Return non-nil when the height of WINDOW shall be preserved.
Optional argument HORIZONTAL non-nil means to return non-nil when
the width of WINDOW shall be preserved."
  (let ((size (window-preserved-size window horizontal)))
    (and (numberp size)
	 (= size (window--preservable-size window horizontal)))))

(defun window-safe-min-size (&optional window horizontal pixelwise)
  "Return safe minimum size of WINDOW.
WINDOW must be a valid window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return the minimum
number of columns of WINDOW; otherwise return the minimum number
of WINDOW's lines.

Optional argument PIXELWISE non-nil means return the minimum pixel-size
of WINDOW."
  (setq window (window-normalize-window window))
  (if pixelwise
      (if horizontal
	  (* window-safe-min-width
	     (frame-char-width (window-frame window)))
	(* window-safe-min-height
	   (frame-char-height (window-frame window))))
    (if horizontal window-safe-min-width window-safe-min-height)))

(defun window-min-size (&optional window horizontal ignore pixelwise)
  "Return the minimum size of WINDOW.
WINDOW must be a valid window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return the minimum
number of columns of WINDOW; otherwise return the minimum number
of WINDOW's lines.

The optional argument IGNORE has the same meaning as for
`window-resizable'.  Optional argument PIXELWISE non-nil means
return the minimum pixel-size of WINDOW."
  (window--min-size-1
   (window-normalize-window window) horizontal ignore pixelwise))

(defun window--min-size-ignore-p (window ignore)
  "Return non-nil if IGNORE says to ignore size restrictions for WINDOW."
  (if (window-valid-p ignore)
      (eq window ignore)
    (not (memq ignore '(nil preserved)))))

(defun window--min-size-1 (window horizontal ignore pixelwise)
  "Internal function of `window-min-size'."
  (let ((sub (window-child window)))
    (if sub
	(let ((value 0))
	  ;; WINDOW is an internal window.
	  (if (window-combined-p sub horizontal)
	      ;; The minimum size of an iso-combination is the sum of
	      ;; the minimum sizes of its child windows.
	      (while sub
		(setq value (+ value
			       (window--min-size-1
				sub horizontal ignore pixelwise)))
		(setq sub (window-right sub)))
	    ;; The minimum size of an ortho-combination is the maximum
	    ;; of the minimum sizes of its child windows.
	    (while sub
	      (setq value (max value
			       (window--min-size-1
				sub horizontal ignore pixelwise)))
	      (setq sub (window-right sub))))
	  value)
      (with-current-buffer (window-buffer window)
	(cond
	 ((window-size-fixed-p window horizontal ignore)
	  ;; The minimum size of a fixed size window is its size.
	  (window-size window horizontal pixelwise))
	 ((eq ignore 'safe)
	  ;; If IGNORE equals `safe' return the safe value.
	  (window-safe-min-size window horizontal pixelwise))
	 (horizontal
	  ;; For the minimum width of a window take fringes and
	  ;; scroll-bars into account.  This is questionable and should
	  ;; be removed as soon as we are able to split (and resize)
	  ;; windows such that the new (or resized) windows can get a
	  ;; size less than the user-specified `window-min-height' and
	  ;; `window-min-width'.
	  (let* ((char-size (frame-char-size window t))
		 (fringes (window-fringes window))
		 (margins (window-margins window))
                 ;; Let the 'min-margins' parameter override the actual
                 ;; widths of the margins.  We allow any number to
                 ;; replace the values specified by `window-margins'.
                 ;; See bug#24193 for the rationale of this parameter.
                 (min-margins (window-parameter window 'min-margins))
                 (left-min-margin (and min-margins
                                       (numberp (car min-margins))
                                       (car min-margins)))
                 (right-min-margin (and min-margins
                                        (numberp (cdr min-margins))
                                        (cdr min-margins)))
		 (pixel-width
		  (+ (window-safe-min-size window t t)
		     (* (or left-min-margin (car margins) 0) char-size)
		     (* (or right-min-margin(cdr margins) 0) char-size)
		     (car fringes) (cadr fringes)
		     (window-scroll-bar-width window)
		     (window-right-divider-width window))))
	    (if pixelwise
		(max
		 (if window-resize-pixelwise
		     pixel-width
		   ;; Round up to next integral of columns.
		   (* (ceiling pixel-width char-size) char-size))
		 (if (window--min-size-ignore-p window ignore)
		     0
		   (window-min-pixel-width window)))
	      (max
	       (ceiling pixel-width char-size)
	       (if (window--min-size-ignore-p window ignore)
		   0
		 window-min-width)))))
	 ((let ((char-size (frame-char-size window))
		(pixel-height
		 (+ (window-safe-min-size window nil t)
		    (window-header-line-height window)
		    (window-scroll-bar-height window)
		    (window-mode-line-height window)
		    (window-bottom-divider-width window))))
	    (if pixelwise
		(max
		 (if window-resize-pixelwise
		     pixel-height
		   ;; Round up to next integral of lines.
		   (* (ceiling pixel-height char-size) char-size))
		 (if (window--min-size-ignore-p window ignore)
		     0
		   (window-min-pixel-height window)))
	      (max (ceiling pixel-height char-size)
		   (if (window--min-size-ignore-p window ignore)
		       0
		     window-min-height))))))))))

(defun window-sizable (window delta &optional horizontal ignore pixelwise)
  "Return DELTA if DELTA lines can be added to WINDOW.
WINDOW must be a valid window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return DELTA if DELTA
columns can be added to WINDOW.  A return value of zero means
that no lines (or columns) can be added to WINDOW.

This function looks only at WINDOW and, recursively, its child
windows.  The function `window-resizable' looks at other windows
as well.

DELTA positive means WINDOW shall be enlarged by DELTA lines or
columns.  If WINDOW cannot be enlarged by DELTA lines or columns
return the maximum value in the range 0..DELTA by which WINDOW
can be enlarged.

DELTA negative means WINDOW shall be shrunk by -DELTA lines or
columns.  If WINDOW cannot be shrunk by -DELTA lines or columns,
return the minimum value in the range DELTA..0 by which WINDOW
can be shrunk.

The optional argument IGNORE has the same meaning as for
`window-resizable'.  Optional argument PIXELWISE non-nil means
interpret DELTA as pixels."
  (setq window (window-normalize-window window))
  (cond
   ((< delta 0)
    (let ((min-size (window-min-size window horizontal ignore pixelwise))
          (size (window-size window horizontal pixelwise)))
      (if (<= size min-size)
          0
        (max (- min-size size) delta))))
   ((> delta 0)
    (if (window-size-fixed-p window horizontal ignore)
	0
      delta))
   (t 0)))

(defun window-sizable-p (window delta &optional horizontal ignore pixelwise)
  "Return t if WINDOW can be resized by DELTA lines.
WINDOW must be a valid window and defaults to the selected one.
For the meaning of the arguments of this function see the
doc-string of `window-sizable'."
  (setq window (window-normalize-window window))
  (if (> delta 0)
      (>= (window-sizable window delta horizontal ignore pixelwise)
	  delta)
    (<= (window-sizable window delta horizontal ignore pixelwise)
	delta)))

(defun window--size-fixed-1 (window horizontal ignore)
  "Internal function for `window-size-fixed-p'."
  (let ((sub (window-child window)))
    (catch 'fixed
      (if sub
	  ;; WINDOW is an internal window.
	  (if (window-combined-p sub horizontal)
	      ;; An iso-combination is fixed size if all its child
	      ;; windows are fixed-size.
	      (progn
		(while sub
		  (unless (window--size-fixed-1 sub horizontal ignore)
		    ;; We found a non-fixed-size child window, so
		    ;; WINDOW's size is not fixed.
		    (throw 'fixed nil))
		  (setq sub (window-right sub)))
		;; All child windows are fixed-size, so WINDOW's size is
		;; fixed.
		(throw 'fixed t))
	    ;; An ortho-combination is fixed-size if at least one of its
	    ;; child windows is fixed-size.
	    (while sub
	      (when (window--size-fixed-1 sub horizontal ignore)
		;; We found a fixed-size child window, so WINDOW's size
		;; is fixed.
		(throw 'fixed t))
	      (setq sub (window-right sub))))
	;; WINDOW is a live window.
	(and (or (not (windowp ignore)) (not (eq window ignore)))
	     (or (and (not (eq ignore 'preserved))
		      (window--preserve-size window horizontal))
		 (with-current-buffer (window-buffer window)
		   (if horizontal
		       (memq window-size-fixed '(width t))
		     (memq window-size-fixed '(height t))))))))))

(defun window-size-fixed-p (&optional window horizontal ignore)
  "Return non-nil if WINDOW's height is fixed.
WINDOW must be a valid window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return non-nil if
WINDOW's width is fixed.  The optional argument IGNORE has the
same meaning as for `window-resizable'.

If this function returns nil, this does not necessarily mean that
WINDOW can be resized in the desired direction.  The function
`window-resizable' can tell that."
  (when (or (windowp ignore) (memq ignore '(nil preserved)))
    (window--size-fixed-1
     (window-normalize-window window) horizontal ignore)))

(defun window--min-delta-1 (window delta &optional horizontal ignore trail noup pixelwise)
  "Internal function for `window-min-delta'."
  (if (not (window-parent window))
      ;; If we can't go up, return zero.
      0
    ;; Else try to find a non-fixed-size sibling of WINDOW.
    (let* ((parent (window-parent window))
	   (sub (window-child parent)))
      (catch 'done
	(if (window-combined-p sub horizontal)
	    ;; In an iso-combination throw DELTA if we find at least one
	    ;; child window and that window is either not fixed-size or
	    ;; we can ignore fixed-sizeness.
	    (let ((skip (eq trail 'after)))
	      (while sub
		(cond
		 ((eq sub window)
		  (setq skip (eq trail 'before)))
		 (skip)
		 ((window-size-fixed-p sub horizontal ignore))
		 (t
		  ;; We found a non-fixed-size child window.
		  (throw 'done delta)))
		(setq sub (window-right sub))))
	  ;; In an ortho-combination set DELTA to the minimum value by
	  ;; which other child windows can shrink.
	  (while sub
	    (unless (eq sub window)
	      (setq delta
		    (min delta
			 (max (- (window-size sub horizontal pixelwise 'ceiling)
				 (window-min-size
				  sub horizontal ignore pixelwise))
			      0))))
	    (setq sub (window-right sub))))
	(if noup
	    delta
	  (window--min-delta-1
	   parent delta horizontal ignore trail nil pixelwise))))))

(defun window-min-delta (&optional window horizontal ignore trail noup nodown pixelwise)
  "Return number of lines by which WINDOW can be shrunk.
WINDOW must be a valid window and defaults to the selected one.
Return zero if WINDOW cannot be shrunk.

Optional argument HORIZONTAL non-nil means return number of
columns by which WINDOW can be shrunk.

The optional argument IGNORE has the same meaning as for
`window-resizable'.  Optional argument TRAIL restricts the
windows that can be enlarged.  If its value is `before', only
windows to the left of or above WINDOW can be enlarged.  If it is
`after', only windows to the right of or below WINDOW can be
enlarged.

Optional argument NOUP non-nil means don't go up in the window
tree, but try to enlarge windows within WINDOW's combination
only.  Optional argument NODOWN non-nil means don't check whether
WINDOW itself (and its child windows) can be shrunk; check only
whether at least one other window can be enlarged appropriately.

Optional argument PIXELWISE non-nil means return number of pixels
by which WINDOW can be shrunk."
  (setq window (window-normalize-window window))
  (let ((size (window-size window horizontal pixelwise 'floor))
	(minimum (window-min-size window horizontal ignore pixelwise)))
    (cond
     (nodown
      ;; If NODOWN is t, try to recover the entire size of WINDOW.
      (window--min-delta-1
       window size horizontal ignore trail noup pixelwise))
     ((<= size minimum)
      ;; If NODOWN is nil and WINDOW's size is already at its minimum,
      ;; there's nothing to recover.
      0)
     (t
      ;; Otherwise, try to recover whatever WINDOW is larger than its
      ;; minimum size.
      (window--min-delta-1
       window (- size minimum) horizontal ignore trail noup pixelwise)))))

(defun frame-windows-min-size (&optional frame horizontal ignore pixelwise)
  "Return minimum number of lines of FRAME's windows.
HORIZONTAL non-nil means return number of columns of FRAME's
windows.  The optional argument IGNORE has the same meaning as
for `window-resizable'.  PIXELWISE non-nil means return sizes in
pixels."
  (setq frame (window-normalize-frame frame))
  (let* ((root (frame-root-window frame))
	 (mini (window-next-sibling root)))
    (+ (window-min-size root horizontal ignore pixelwise)
       (if (and mini (not horizontal))
	   (window-min-size mini horizontal nil pixelwise)
	 0))))

(defun window--max-delta-1 (window delta &optional horizontal ignore trail noup pixelwise)
  "Internal function of `window-max-delta'."
  (if (not (window-parent window))
      ;; Can't go up.  Return DELTA.
      delta
    (let* ((parent (window-parent window))
	   (sub (window-child parent)))
      (catch 'fixed
	(if (window-combined-p sub horizontal)
	    ;; For an iso-combination calculate how much we can get from
	    ;; other child windows.
	    (let ((skip (eq trail 'after)))
	      (while sub
		(cond
		 ((eq sub window)
		  (setq skip (eq trail 'before)))
		 (skip)
		 (t
		  (setq delta
			(+ delta
			   (max
			    (- (window-size sub horizontal pixelwise 'floor)
			       (window-min-size
				sub horizontal ignore pixelwise))
			    0)))))
		(setq sub (window-right sub))))
	  ;; For an ortho-combination throw DELTA when at least one
	  ;; child window is fixed-size.
	  (while sub
	    (when (and (not (eq sub window))
		       (window-size-fixed-p sub horizontal ignore))
	      (throw 'fixed delta))
	    (setq sub (window-right sub))))
	(if noup
	    ;; When NOUP is nil, DELTA is all we can get.
	    delta
	  ;; Else try with parent of WINDOW, passing the DELTA we
	  ;; recovered so far.
	  (window--max-delta-1
	   parent delta horizontal ignore trail nil pixelwise))))))

(defun window-max-delta (&optional window horizontal ignore trail noup nodown pixelwise)
  "Return maximum number of lines by which WINDOW can be enlarged.
WINDOW must be a valid window and defaults to the selected one.
The return value is zero if WINDOW cannot be enlarged.

Optional argument HORIZONTAL non-nil means return maximum number
of columns by which WINDOW can be enlarged.

The optional argument IGNORE has the same meaning as for
`window-resizable'.  Optional argument TRAIL restricts the
windows that can be enlarged.  If its value is `before', only
windows to the left of or above WINDOW can be enlarged.  If it is
`after', only windows to the right of or below WINDOW can be
enlarged.

Optional argument NOUP non-nil means don't go up in the window
tree but try to obtain the entire space from windows within
WINDOW's combination.  Optional argument NODOWN non-nil means do
not check whether WINDOW itself (and its child windows) can be
enlarged; check only whether other windows can be shrunk
appropriately.

Optional argument PIXELWISE non-nil means return number of
pixels by which WINDOW can be enlarged."
  (setq window (window-normalize-window window))
  (if (and (not nodown) (window-size-fixed-p window horizontal ignore))
      ;; With IGNORE and NOWDON nil return zero if WINDOW has fixed
      ;; size.
      0
    ;; WINDOW has no fixed size.
    (window--max-delta-1 window 0 horizontal ignore trail noup pixelwise)))

;; Make NOUP also inhibit the min-size check.
(defun window--resizable (window delta &optional horizontal ignore trail noup nodown pixelwise)
  "Return DELTA if WINDOW can be resized vertically by DELTA lines.
WINDOW must be a valid window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return DELTA if WINDOW
can be resized horizontally by DELTA columns.  A return value of
zero means that WINDOW is not resizable.

DELTA positive means WINDOW shall be enlarged by DELTA lines or
columns.  If WINDOW cannot be enlarged by DELTA lines or columns,
return the maximum value in the range 0..DELTA by which WINDOW
can be enlarged.

DELTA negative means WINDOW shall be shrunk by -DELTA lines or
columns.  If WINDOW cannot be shrunk by -DELTA lines or columns,
return the minimum value in the range DELTA..0 that can be used
for shrinking WINDOW.

The optional argument IGNORE has the same meaning as for
`window-resizable'.  Optional argument TRAIL `before' means only
windows to the left of or below WINDOW can be shrunk.  Optional
argument TRAIL `after' means only windows to the right of or
above WINDOW can be shrunk.

Optional argument NOUP non-nil means don't go up in the window
tree but check only whether space can be obtained from (or given
to) WINDOW's siblings.  Optional argument NODOWN non-nil means
don't go down in the window tree.  This means do not check
whether resizing would violate size restrictions of WINDOW or its
child windows.

Optional argument PIXELWISE non-nil means interpret DELTA as
number of pixels."
  (setq window (window-normalize-window window))
  (cond
   ((< delta 0)
    (max (- (window-min-delta
	     window horizontal ignore trail noup nodown pixelwise))
	 delta))
   ((> delta 0)
    (min (window-max-delta
	  window horizontal ignore trail noup nodown pixelwise)
	 delta))
   (t 0)))

(defun window--resizable-p (window delta &optional horizontal ignore trail noup nodown pixelwise)
  "Return t if WINDOW can be resized vertically by DELTA lines.
WINDOW must be a valid window and defaults to the selected one.
For the meaning of the arguments of this function see the
doc-string of `window--resizable'.

Optional argument PIXELWISE non-nil means interpret DELTA as
pixels."
  (setq window (window-normalize-window window))
  (if (> delta 0)
      (>= (window--resizable
	   window delta horizontal ignore trail noup nodown pixelwise)
	  delta)
    (<= (window--resizable
	 window delta horizontal ignore trail noup nodown pixelwise)
	delta)))

(defun window-resizable (window delta &optional horizontal ignore pixelwise)
  "Return DELTA if WINDOW can be resized vertically by DELTA lines.
WINDOW must be a valid window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return DELTA if WINDOW
can be resized horizontally by DELTA columns.  A return value of
zero means that WINDOW is not resizable.

DELTA positive means WINDOW shall be enlarged by DELTA lines or
columns.  If WINDOW cannot be enlarged by DELTA lines or columns
return the maximum value in the range 0..DELTA by which WINDOW
can be enlarged.

DELTA negative means WINDOW shall be shrunk by -DELTA lines or
columns.  If WINDOW cannot be shrunk by -DELTA lines or columns,
return the minimum value in the range DELTA..0 that can be used
for shrinking WINDOW.

Optional argument IGNORE, if non-nil, means to ignore restraints
induced by fixed size windows or the values of the variables
`window-min-height' and `window-min-width'.  The following values
have special meanings: `safe' means that in addition live windows
are allowed to get as small as `window-safe-min-height' lines and
`window-safe-min-width' columns.  `preserved' means to ignore
only restrictions induced by `window-preserve-size'.  If IGNORE
is a window, then ignore restrictions for that window only.

Optional argument PIXELWISE non-nil means interpret DELTA as
pixels."
  (setq window (window-normalize-window window))
  (window--resizable window delta horizontal ignore nil nil nil pixelwise))

(defun window-resizable-p (window delta &optional horizontal ignore pixelwise)
  "Return t if WINDOW can be resized vertically by DELTA lines.
WINDOW must be a valid window and defaults to the selected one.
For the meaning of the arguments of this function see the
doc-string of `window-resizable'."
  (setq window (window-normalize-window window))
  (if (> delta 0)
      (>= (window--resizable
	   window delta horizontal ignore nil nil nil pixelwise)
	  delta)
    (<= (window--resizable
	 window delta horizontal ignore nil nil nil pixelwise)
	delta)))

;; Aliases of functions defined in window.c.
(defalias 'window-height 'window-total-height)
(defalias 'window-width 'window-body-width)
(defalias 'window-pixel-width-before-size-change 'window-old-pixel-width)
(defalias 'window-pixel-height-before-size-change 'window-old-pixel-height)

(defun window-full-height-p (&optional window)
  "Return t if WINDOW is as high as its containing frame.
More precisely, return t if and only if the total height of
WINDOW equals the total height of the root window of WINDOW's
frame.  WINDOW must be a valid window and defaults to the
selected one."
  (setq window (window-normalize-window window))
  (if (window-minibuffer-p window)
      (eq window (frame-root-window (window-frame window)))
    (= (window-pixel-height window)
       (window-pixel-height (frame-root-window window)))))

(defun window-full-width-p (&optional window)
  "Return t if WINDOW is as wide as its containing frame.
More precisely, return t if and only if the total width of WINDOW
equals the total width of the root window of WINDOW's frame.
WINDOW must be a valid window and defaults to the selected one."
  (setq window (window-normalize-window window))
  (= (window-pixel-width window)
     (window-pixel-width (frame-root-window window))))

(defun window-body-size (&optional window horizontal pixelwise)
  "Return the height or width of WINDOW's text area.
WINDOW must be a live window and defaults to the selected one.

If HORIZONTAL is omitted or nil, return the height of the text
area, like `window-body-height'.  Otherwise, return the width of
the text area, like `window-body-width'.  In either case, the
optional argument PIXELWISE is passed to the functions."
  (if horizontal
      (window-body-width window pixelwise)
    (window-body-height window pixelwise)))

(declare-function font-info "font.c" (name &optional frame))

(defun window-font-width (&optional window face)
   "Return average character width for the font of FACE used in WINDOW.
WINDOW must be a live window and defaults to the selected one.

If FACE is nil or omitted, the default face is used.  If FACE is
remapped (see `face-remapping-alist'), the function returns the
information for the remapped face."
   (with-selected-window (window-normalize-window window t)
     (if (display-multi-font-p)
	 (let* ((face (if face face 'default))
		(info (font-info (face-font face)))
		(width (aref info 11)))
	   (if (> width 0)
	      width
	     (aref info 10)))
       (frame-char-width))))

(defun window-font-height (&optional window face)
   "Return character height for the font of FACE used in WINDOW.
WINDOW must be a live window and defaults to the selected one.

If FACE is nil or omitted, the default face is used.  If FACE is
remapped (see `face-remapping-alist'), the function returns the
information for the remapped face."
   (with-selected-window (window-normalize-window window t)
     (if (display-multi-font-p)
	 (let* ((face (if face face 'default))
		(info (font-info (face-font face))))
	   (aref info 3))
       (frame-char-height))))

(defvar overflow-newline-into-fringe)

(defun window-max-chars-per-line (&optional window face)
  "Return the number of characters that can be displayed on one line in WINDOW.
WINDOW must be a live window and defaults to the selected one.

The character width of FACE is used for the calculation.  If FACE
is nil or omitted, the default face is used.  If FACE is
remapped (see `face-remapping-alist'), the function uses the
remapped face.

This function is different from `window-body-width' in two
ways.  First, it accounts for the portions of the line reserved
for the continuation glyph.  Second, it accounts for the size of
the font."
  (with-selected-window (window-normalize-window window t)
    (let* ((window-width (window-body-width window t))
	   (font-width (window-font-width window face))
	   (ncols (- (/ window-width font-width)
                     (ceiling (line-number-display-width 'columns)))))
      (if (and (display-graphic-p)
	       overflow-newline-into-fringe
               (not
                (or (eq left-fringe-width 0)
                    (and (null left-fringe-width)
                         (= (frame-parameter nil 'left-fringe) 0))))
               (not
                (or (eq right-fringe-width 0)
                    (and (null right-fringe-width)
                         (= (frame-parameter nil 'right-fringe) 0)))))
	  ncols
        ;; FIXME: This should remove 1 more column when there are no
        ;; fringes, lines are truncated, and the window is hscrolled,
        ;; but EOL is not in the view, because then there are 2
        ;; truncation glyphs, not one.
	(1- ncols)))))

(defun window-current-scroll-bars (&optional window)
  "Return the current scroll bar types for WINDOW.
WINDOW must be a live window and defaults to the selected one.

The return value is a cons cell (VERTICAL . HORIZONTAL) where
VERTICAL specifies the current location of the vertical scroll
bar (`left', `right' or nil), and HORIZONTAL specifies the
current location of the horizontal scroll bar (`bottom' or nil).

Unlike `window-scroll-bars', this function reports the scroll bar
type actually used, once frame defaults and `scroll-bar-mode' are
taken into account."
  (setq window (window-normalize-window window t))
  (let ((vertical (nth 2 (window-scroll-bars window)))
	(horizontal (nth 5 (window-scroll-bars window)))
	(inherited (frame-current-scroll-bars (window-frame window))))
    (when (eq vertical t)
      (setq vertical (car inherited)))
    (when (eq horizontal t)
      (setq horizontal (cdr inherited)))
    (cons vertical (and horizontal 'bottom))))

(defun walk-windows (fun &optional minibuf all-frames)
  "Cycle through all live windows, calling FUN for each one.
FUN must specify a function with a window as its sole argument.
The optional arguments MINIBUF and ALL-FRAMES specify the set of
windows to include in the walk.

MINIBUF t means include the minibuffer window even if the
minibuffer is not active.  MINIBUF nil or omitted means include
the minibuffer window only if the minibuffer is active.  Any
other value means do not include the minibuffer window even if
the minibuffer is active.

ALL-FRAMES nil or omitted means consider all windows on the
selected frame, plus the minibuffer window if specified by the
MINIBUF argument.  If the minibuffer counts, consider all windows
on all frames that share that minibuffer too.  The following
non-nil values of ALL-FRAMES have special meanings:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

If ALL-FRAMES specifies a frame, the first window walked is the
first window on that frame (the one returned by `frame-first-window'),
not necessarily the selected window.

Anything else means consider all windows on the selected frame
and no others.

This function changes neither the order of recently selected
windows nor the buffer list."
  ;; If we start from the minibuffer window, don't fail to come
  ;; back to it.
  (when (window-minibuffer-p)
    (setq minibuf t))
  ;; Use `save-selected-window' to prevent FUN from messing up
  ;; the order of windows when it changes the selected window.
  (save-selected-window
    (dolist (walk-windows-window
             (window-list-1 (and (framep all-frames)
                                 (frame-first-window all-frames))
                            minibuf all-frames))
      (funcall fun walk-windows-window))))

(defun window-at-side-p (&optional window side)
  "Return t if WINDOW is at SIDE of its containing frame.
WINDOW must be a valid window and defaults to the selected one.
SIDE can be any of the symbols `left', `top', `right' or
`bottom'.  The default value nil is handled like `bottom'."
  (setq window (window-normalize-window window))
  (let ((edge
	 (cond
	  ((eq side 'left) 0)
	  ((eq side 'top) 1)
	  ((eq side 'right) 2)
	  ((memq side '(bottom nil)) 3))))
    (= (nth edge (window-pixel-edges window))
       (nth edge (window-pixel-edges (frame-root-window window))))))

(defun window-at-side-list (&optional frame side)
  "Return list of all windows on SIDE of FRAME.
FRAME must be a live frame and defaults to the selected frame.
SIDE can be any of the symbols `left', `top', `right' or
`bottom'.  The default value nil is handled like `bottom'."
  (setq frame (window-normalize-frame frame))
  (let (windows)
    (walk-window-tree
     (lambda (window)
       (when (window-at-side-p window side)
	 (setq windows (cons window windows))))
     frame nil 'nomini)
    (nreverse windows)))

(defun window--in-direction-2 (window posn &optional horizontal)
  "Support function for `window-in-direction'."
  (if horizontal
      (let ((top (window-pixel-top window)))
	(if (> top posn)
	    (- top posn)
	  (- posn top (window-pixel-height window))))
    (let ((left (window-pixel-left window)))
      (if (> left posn)
	  (- left posn)
	(- posn left (window-pixel-width window))))))

;; Predecessors to the below have been devised by Julian Assange in
;; change-windows-intuitively.el and Hovav Shacham in windmove.el.
;; Neither of these allow one to selectively ignore specific windows
;; (windows whose `no-other-window' parameter is non-nil) as targets of
;; the movement.
(defun window-in-direction (direction &optional window ignore sign wrap minibuf)
  "Return window in DIRECTION as seen from WINDOW.
More precisely, return the nearest window in direction DIRECTION
as seen from the position of `window-point' in window WINDOW.
DIRECTION should be one of `above', `below', `left' or `right'.
WINDOW must be a live window and defaults to the selected one.

Do not return a window whose `no-other-window' parameter is
non-nil.  If the nearest window's `no-other-window' parameter is
non-nil, try to find another window in the indicated direction.
If, however, the optional argument IGNORE is non-nil, return that
window even if its `no-other-window' parameter is non-nil.

Optional argument SIGN a negative number means to use the right
or bottom edge of WINDOW as reference position instead of
`window-point'.  SIGN a positive number means to use the left or
top edge of WINDOW as reference position.

Optional argument WRAP non-nil means to wrap DIRECTION around
frame borders.  This means to return for WINDOW at the top of the
frame and DIRECTION `above' the minibuffer window if the frame
has one, and a window at the bottom of the frame otherwise.

Optional argument MINIBUF t means to return the minibuffer
window even if it isn't active.  MINIBUF nil or omitted means
to return the minibuffer window if and only if it is currently active.
MINIBUF neither nil nor t means never return the minibuffer window.
However, if WRAP is non-nil, always act as if MINIBUF were nil.

Return nil if no suitable window can be found."
  (setq window (window-normalize-window window t))
  (cond
   ((eq direction 'up)
    (setq direction 'above))
   ((eq direction 'down)
    (setq direction 'below))
   ((not (memq direction '(above below left right)))
    (error "Wrong direction %s" direction)))
  (let* ((frame (window-frame window))
	 (hor (memq direction '(left right)))
	 (first (if hor
		    (window-pixel-left window)
		  (window-pixel-top window)))
	 (last (+ first (window-size window hor t)))
	 ;; The column / row value of `posn-at-point' can be nil for the
	 ;; mini-window, guard against that.
	 (posn
	  (cond
	   ((and (numberp sign) (< sign 0))
	    (if hor
		(1- (+ (window-pixel-top window) (window-pixel-height window)))
	      (1- (+ (window-pixel-left window) (window-pixel-width window)))))
	   ((and (numberp sign) (> sign 0))
	    (if hor
		(window-pixel-top window)
	      (window-pixel-left window)))
	   ((let ((posn-cons (nth 2 (posn-at-point (window-point window) window))))
	      (if hor
		  (+ (or (cdr posn-cons) 1) (window-pixel-top window))
		(+ (or (car posn-cons) 1) (window-pixel-left window)))))))
	 (best-edge
	  (cond
	   ((eq direction 'below) (frame-pixel-height frame))
	   ((eq direction 'right) (frame-pixel-width frame))
	   (t -1)))
	 (best-edge-2 best-edge)
	 (best-diff-2 (if hor (frame-pixel-height frame) (frame-pixel-width frame)))
	 best best-2 best-diff-2-new)
    (walk-window-tree
     (lambda (w)
       (let* ((w-top (window-pixel-top w))
	      (w-left (window-pixel-left w)))
	 (cond
	  ((or (eq window w)
	       ;; Ignore ourselves.
	       (and (window-parameter w 'no-other-window)
		    ;; Ignore W unless IGNORE is non-nil.
		    (not ignore))))
	  (hor
	   (cond
	    ((and (<= w-top posn)
		  (< posn (+ w-top (window-pixel-height w))))
	     ;; W is to the left or right of WINDOW and covers POSN.
	     (when (or (and (eq direction 'left)
			    (or (and (<= w-left first) (> w-left best-edge))
				(and wrap
				     (window-at-side-p window 'left)
				     (window-at-side-p w 'right))))
		       (and (eq direction 'right)
			    (or (and (>= w-left last) (< w-left best-edge))
				(and wrap
				     (window-at-side-p window 'right)
				     (window-at-side-p w 'left)))))
	       (setq best-edge w-left)
	       (setq best w)))
	    ((and (or (and (eq direction 'left)
			   (<= (+ w-left (window-pixel-width w)) first))
		      (and (eq direction 'right) (<= last w-left)))
		  ;; W is to the left or right of WINDOW but does not
		  ;; cover POSN.
		  (setq best-diff-2-new
			(window--in-direction-2 w posn hor))
		  (or (< best-diff-2-new best-diff-2)
		      (and (= best-diff-2-new best-diff-2)
			   (if (eq direction 'left)
			       (> w-left best-edge-2)
			     (< w-left best-edge-2)))))
	     (setq best-edge-2 w-left)
	     (setq best-diff-2 best-diff-2-new)
	     (setq best-2 w))))
	  ((and (<= w-left posn)
		(< posn (+ w-left (window-pixel-width w))))
	   ;; W is above or below WINDOW and covers POSN.
	   (when (or (and (eq direction 'above)
			  (or (and (<= w-top first) (> w-top best-edge))
			      (and wrap
				   (window-at-side-p window 'top)
				   (if (active-minibuffer-window)
				       (minibuffer-window-active-p w)
				     (window-at-side-p w 'bottom)))))
		     (and (eq direction 'below)
			  (or (and (>= w-top first) (< w-top best-edge))
			      (and wrap
				   (if (active-minibuffer-window)
				       (minibuffer-window-active-p window)
				     (window-at-side-p window 'bottom))
				   (window-at-side-p w 'top)))))
	     (setq best-edge w-top)
	     (setq best w)))
	  ((and (or (and (eq direction 'above)
			 (<= (+ w-top (window-pixel-height w)) first))
		    (and (eq direction 'below) (<= last w-top)))
		;; W is above or below WINDOW but does not cover POSN.
		(setq best-diff-2-new
		      (window--in-direction-2 w posn hor))
		(or (< best-diff-2-new best-diff-2)
		    (and (= best-diff-2-new best-diff-2)
			 (if (eq direction 'above)
			     (> w-top best-edge-2)
			   (< w-top best-edge-2)))))
	   (setq best-edge-2 w-top)
	   (setq best-diff-2 best-diff-2-new)
	   (setq best-2 w)))))
     frame nil minibuf)
    (or best best-2)))

(defun get-window-with-predicate (predicate &optional minibuf all-frames default)
  "Return a live window satisfying PREDICATE.
More precisely, cycle through all windows calling the function
PREDICATE on each one of them with the window as its sole
argument.  Return the first window for which PREDICATE returns
non-nil.  Windows are scanned starting with the window following
the selected window.  If no window satisfies PREDICATE, return
DEFAULT.

MINIBUF t means include the minibuffer window even if the
minibuffer is not active.  MINIBUF nil or omitted means include
the minibuffer window only if the minibuffer is active.  Any
other value means do not include the minibuffer window even if
the minibuffer is active.

ALL-FRAMES nil or omitted means consider all windows on the selected
frame, plus the minibuffer window if specified by the MINIBUF
argument.  If the minibuffer counts, consider all windows on all
frames that share that minibuffer too.  The following non-nil
values of ALL-FRAMES have special meanings:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Anything else means consider all windows on the selected frame
and no others."
  (catch 'found
    (dolist (window (window-list-1
		     (next-window nil minibuf all-frames)
		     minibuf all-frames))
      (when (funcall predicate window)
	(throw 'found window)))
    default))

(defalias 'some-window 'get-window-with-predicate)

(defun get-lru-window (&optional all-frames dedicated not-selected)
   "Return the least recently used window on frames specified by ALL-FRAMES.
Return a full-width window if possible.  A minibuffer window is
never a candidate.  A dedicated window is never a candidate
unless DEDICATED is non-nil, so if all windows are dedicated, the
value is nil.  Avoid returning the selected window if possible.
Optional argument NOT-SELECTED non-nil means never return the
selected window.

The following non-nil values of the optional argument ALL-FRAMES
have special meanings:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Any other value of ALL-FRAMES means consider all windows on the
selected frame and no others."
   (let (best-window best-time second-best-window second-best-time time)
    (dolist (window (window-list-1 nil 'nomini all-frames))
      (when (and (or dedicated (not (window-dedicated-p window)))
		 (or (not not-selected) (not (eq window (selected-window)))))
	(setq time (window-use-time window))
	(if (or (eq window (selected-window))
		(not (window-full-width-p window)))
	    (when (or (not second-best-time) (< time second-best-time))
	      (setq second-best-time time)
	      (setq second-best-window window))
	  (when (or (not best-time) (< time best-time))
	    (setq best-time time)
	    (setq best-window window)))))
    (or best-window second-best-window)))

(defun get-mru-window (&optional all-frames dedicated not-selected)
   "Return the most recently used window on frames specified by ALL-FRAMES.
A minibuffer window is never a candidate.  A dedicated window is
never a candidate unless DEDICATED is non-nil, so if all windows
are dedicated, the value is nil.  Optional argument NOT-SELECTED
non-nil means never return the selected window.

The following non-nil values of the optional argument ALL-FRAMES
have special meanings:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Any other value of ALL-FRAMES means consider all windows on the
selected frame and no others."
   (let (best-window best-time time)
    (dolist (window (window-list-1 nil 'nomini all-frames))
      (setq time (window-use-time window))
      (when (and (or dedicated (not (window-dedicated-p window)))
		 (or (not not-selected) (not (eq window (selected-window))))
		 (or (not best-time) (> time best-time)))
	(setq best-time time)
	(setq best-window window)))
    best-window))

(defun get-largest-window (&optional all-frames dedicated not-selected)
  "Return the largest window on frames specified by ALL-FRAMES.
A minibuffer window is never a candidate.  A dedicated window is
never a candidate unless DEDICATED is non-nil, so if all windows
are dedicated, the value is nil.  Optional argument NOT-SELECTED
non-nil means never return the selected window.

The following non-nil values of the optional argument ALL-FRAMES
have special meanings:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Any other value of ALL-FRAMES means consider all windows on the
selected frame and no others."
  (let ((best-size 0)
	best-window size)
    (dolist (window (window-list-1 nil 'nomini all-frames))
      (when (and (or dedicated (not (window-dedicated-p window)))
		 (or (not not-selected) (not (eq window (selected-window)))))
	(setq size (* (window-pixel-height window)
		      (window-pixel-width window)))
	(when (> size best-size)
	  (setq best-size size)
	  (setq best-window window))))
    best-window))

(defun get-buffer-window-list (&optional buffer-or-name minibuf all-frames)
  "Return list of all windows displaying BUFFER-OR-NAME, or nil if none.
BUFFER-OR-NAME may be a buffer or the name of an existing buffer
and defaults to the current buffer.  If the selected window displays
BUFFER-OR-NAME, it will be the first in the resulting list.

MINIBUF t means include the minibuffer window even if the
minibuffer is not active.  MINIBUF nil or omitted means include
the minibuffer window only if the minibuffer is active.  Any
other value means do not include the minibuffer window even if
the minibuffer is active.

ALL-FRAMES nil or omitted means consider all windows on the
selected frame, plus the minibuffer window if specified by the
MINIBUF argument.  If the minibuffer counts, consider all windows
on all frames that share that minibuffer too.  The following
non-nil values of ALL-FRAMES have special meanings:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Anything else means consider all windows on the selected frame
and no others."
  (let ((buffer (window-normalize-buffer buffer-or-name))
	windows)
    (dolist (window (window-list-1 (selected-window) minibuf all-frames))
      (when (eq (window-buffer window) buffer)
	(setq windows (cons window windows))))
    (nreverse windows)))

(defun minibuffer-window-active-p (window)
  "Return t if WINDOW is the currently active minibuffer window."
  (and (window-live-p window) (eq window (active-minibuffer-window))))

(defun count-windows (&optional minibuf all-frames)
   "Return the number of live windows on the selected frame.

The optional argument MINIBUF specifies whether the minibuffer
window is included in the count.

If ALL-FRAMES is non-nil, count the windows in all frames instead
just the selected frame.

See `walk-windows' for the precise meaning of this argument."
   (length (window-list-1 nil minibuf all-frames)))
\f
;;; Resizing windows.
(defun window--size-to-pixel (window size &optional horizontal pixelwise round-maybe)
  "For WINDOW convert SIZE lines to pixels.
SIZE is supposed to specify a height of WINDOW in terms of text
lines.  The return value is the number of pixels specifying that
height.

WINDOW must be a valid window.  Optional argument HORIZONTAL
non-nil means convert SIZE columns to pixels.

Optional argument PIXELWISE non-nil means SIZE already specifies
pixels but may have to be adjusted to a multiple of the character
size of WINDOW's frame.  Optional argument ROUND-MAYBE non-nil
means round to the nearest multiple of the character size of
WINDOW's frame if the option `window-resize-pixelwise' is nil."
  (setq window (window-normalize-window window))
  (let ((char-size (frame-char-size window horizontal)))
    (if pixelwise
	(if (and round-maybe (not window-resize-pixelwise))
	    (* (round size char-size) char-size)
	  size)
      (* size char-size))))

(defun window--pixel-to-total-1 (window horizontal char-size)
  "Subroutine of `window--pixel-to-total'."
  (let ((child (window-child window)))
    (if (window-combination-p window horizontal)
	;; In an iso-combination distribute sizes proportionally.
	(let ((remainder (window-new-total window))
	      size best-child rem best-rem)
	  ;; Initialize total sizes to each child's floor.
	  (while child
	    (setq size (max (/ (window-size child horizontal t) char-size) 1))
	    (set-window-new-total child size)
	    (setq remainder (- remainder size))
	    (setq child (window-next-sibling child)))
	  ;; Distribute remainder.
	  (while (> remainder 0)
	    (setq child (window-last-child window))
	    (setq best-child nil)
	    (setq best-rem 0)
	    (while child
	      (when (and (<= (window-new-total child)
			     (/ (window-size child horizontal t) char-size))
			 (> (setq rem (% (window-size child horizontal t)
					 char-size))
			    best-rem))
		   (setq best-child child)
		   (setq best-rem rem))
	      (setq child (window-prev-sibling child)))
	    ;; We MUST have a best-child here.
	    (set-window-new-total best-child 1 t)
	    (setq remainder (1- remainder)))
	  ;; Recurse.
	  (setq child (window-child window))
	  (while child
	    (window--pixel-to-total-1 child horizontal char-size)
	    (setq child (window-next-sibling child))))
      ;; In an ortho-combination assign new sizes directly.
      (let ((size (window-new-total window)))
	(while child
	  (set-window-new-total child size)
	  (window--pixel-to-total-1 child horizontal char-size)
	  (setq child (window-next-sibling child)))))))

(defun window--pixel-to-total (&optional frame horizontal)
  "On FRAME assign new total window heights from pixel heights.
FRAME must be a live frame and defaults to the selected frame.

Optional argument HORIZONTAL non-nil means assign new total
window widths from pixel widths."
  (setq frame (window-normalize-frame frame))
  (let* ((char-size (frame-char-size frame horizontal))
	 (root (frame-root-window frame))
	 (root-size (window-size root horizontal t))
	 ;; We have to care about the minibuffer window only if it
	 ;; appears together with the root window on this frame.
	 (mini (let ((mini (minibuffer-window frame)))
		 (and (eq (window-frame mini) frame)
		      (not (eq mini root)) mini)))
	 (mini-size (and mini (window-size mini horizontal t))))
    ;; We round the line/column sizes of windows here to the nearest
    ;; integer.  In some cases this can make windows appear _larger_
    ;; than the containing frame (line/column-wise) because the latter's
    ;; sizes are not (yet) rounded.  We might eventually fix that.
    (if (and mini (not horizontal))
	(let (lines)
	  (set-window-new-total root (max (/ root-size char-size) 1))
	  (set-window-new-total mini (max (/ mini-size char-size) 1))
	  (setq lines (- (round (+ root-size mini-size) char-size)
			 (+ (window-new-total root) (window-new-total mini))))
	  (while (> lines 0)
	    (if (>= (% root-size (window-new-total root))
		    (% mini-size (window-new-total mini)))
		(set-window-new-total root 1 t)
	      (set-window-new-total mini 1 t))
	    (setq lines (1- lines))))
      (set-window-new-total root (round root-size char-size))
      (when mini
	;; This is taken in the horizontal case only.
	(set-window-new-total mini (round mini-size char-size))))
    (unless (window-buffer root)
      (window--pixel-to-total-1 root horizontal char-size))
    ;; Apply the new sizes.
    (window-resize-apply-total frame horizontal)))

(defun window--resize-reset (&optional frame horizontal)
  "Reset resize values for all windows on FRAME.
FRAME defaults to the selected frame.

This function stores the current value of `window-size' applied
with argument HORIZONTAL in the new total size of all windows on
FRAME.  It also resets the new normal size of each of these
windows."
  (window--resize-reset-1
   (frame-root-window (window-normalize-frame frame)) horizontal))

(defun window--resize-reset-1 (window horizontal)
  "Internal function of `window--resize-reset'."
  ;; Register old size in the new total size.
  (set-window-new-pixel window (window-size window horizontal t))
  (set-window-new-total window (window-size window horizontal))
  ;; Reset new normal size.
  (set-window-new-normal window)
  (when (window-child window)
    (window--resize-reset-1 (window-child window) horizontal))
  (when (window-right window)
    (window--resize-reset-1 (window-right window) horizontal)))

;; The following is the internal function used when resizing mini
;; windows "manually", for example, when dragging a divider between
;; root and mini window.  The routines for automatic minibuffer window
;; resizing call `window--resize-root-window-vertically' instead.
(defun window--resize-mini-window (window delta)
  "Change height of mini window WINDOW by DELTA pixels.
If WINDOW cannot be resized by DELTA pixels make it as large (or
as small) as possible, but don't signal an error."
  (when (window-minibuffer-p window)
    (let* ((frame (window-frame window))
	   (root (frame-root-window frame))
	   (height (window-pixel-height window))
           (min-height (+ (frame-char-height frame)
                          (- (window-pixel-height window)
                             (window-body-height window t))))
           (max-delta (- (window-pixel-height root)
	                 (window-min-size root nil nil t))))
      ;; Don't make mini window too small.
      (when (< (+ height delta) min-height)
	(setq delta (- min-height height)))
      ;; Don't make root window too small.
      (when (> delta max-delta)
	(setq delta max-delta))

      (unless (zerop delta)
	(window--resize-reset frame)
	(window--resize-this-window root (- delta) nil nil t)
	(set-window-new-pixel window (+ height delta))
	;; The following routine catches the case where we want to resize
	;; a minibuffer-only frame.
	(when (resize-mini-window-internal window)
	  (window--pixel-to-total frame))))))

(defun window--resize-apply-p (frame &optional horizontal)
  "Return t when a window on FRAME shall be resized vertically.
Optional argument HORIZONTAL non-nil means return t when a window
shall be resized horizontally."
  (catch 'apply
    (walk-window-tree
     (lambda (window)
       (unless (= (window-new-pixel window)
		  (window-size window horizontal t))
	 (throw 'apply t)))
     frame t t)
    nil))

(defun window-resize (window delta &optional horizontal ignore pixelwise)
  "Resize WINDOW vertically by DELTA lines.
WINDOW can be an arbitrary window and defaults to the selected
one.  An attempt to resize the root window of a frame will raise
an error though.

DELTA a positive number means WINDOW shall be enlarged by DELTA
lines.  DELTA negative means WINDOW shall be shrunk by -DELTA
lines.

Optional argument HORIZONTAL non-nil means resize WINDOW
horizontally by DELTA columns.  In this case a positive DELTA
means enlarge WINDOW by DELTA columns.  DELTA negative means
WINDOW shall be shrunk by -DELTA columns.

Optional argument IGNORE, if non-nil, means to ignore restraints
induced by fixed size windows or the values of the variables
`window-min-height' and `window-min-width'.  The following values
have special meanings: `safe' means that in addition live windows
are allowed to get as small as `window-safe-min-height' lines and
`window-safe-min-width' columns.  `preserved' means to ignore
only restrictions induced by `window-preserve-size'.  If IGNORE
is a window, then ignore restrictions for that window only.

Optional argument PIXELWISE non-nil means resize WINDOW by DELTA
pixels.

This function resizes other windows proportionally and never
deletes any windows.  If you want to move only the low (right)
edge of WINDOW consider using `adjust-window-trailing-edge'
instead."
  (setq window (window-normalize-window window))
  (let* ((frame (window-frame window))
	 (minibuffer-window (minibuffer-window frame))
	 sibling)
    (setq delta (window--size-to-pixel
		 window delta horizontal pixelwise t))
    (cond
     ((eq window (frame-root-window frame))
      (error "Cannot resize the root window of a frame"))
     ((window-minibuffer-p window)
      (if horizontal
	  (error "Cannot resize minibuffer window horizontally")
	(window--resize-mini-window window delta)))
     ((and (not horizontal)
	   (window-full-height-p window)
	   (eq (window-frame minibuffer-window) frame)
	   (or (not resize-mini-windows)
	       (eq minibuffer-window (active-minibuffer-window))))
      ;; If WINDOW is full height and either `resize-mini-windows' is
      ;; nil or the minibuffer window is active, resize the minibuffer
      ;; window.
      (window--resize-mini-window minibuffer-window (- delta)))
     ((or (window--resizable-p
	   window delta horizontal ignore nil nil nil t)
	  (and (not ignore)
	       (setq ignore 'preserved)
	       (window--resizable-p
		window delta horizontal ignore nil nil nil t)))
      (window--resize-reset frame horizontal)
      (window--resize-this-window window delta horizontal ignore t)
      (if (and (not (eq window-combination-resize t))
	       (window-combined-p window horizontal)
	       (setq sibling (or (window-right window) (window-left window)))
	       (window-sizable-p
		sibling (- delta) horizontal ignore t))
	  ;; If window-combination-resize is nil, WINDOW is part of an
	  ;; iso-combination, and WINDOW's neighboring right or left
	  ;; sibling can be resized as requested, resize that sibling.
	  (let ((normal-delta
		 (/ (float delta)
		    (window-size (window-parent window) horizontal t))))
	    (window--resize-this-window sibling (- delta) horizontal nil t)
	    (set-window-new-normal
	     window (+ (window-normal-size window horizontal)
		       normal-delta))
	    (set-window-new-normal
	     sibling (- (window-normal-size sibling horizontal)
			normal-delta)))
	;; Otherwise, resize all other windows in the same combination.
	(window--resize-siblings window delta horizontal ignore))
      (when (window--resize-apply-p frame horizontal)
	(if (window-resize-apply frame horizontal)
	    (window--pixel-to-total frame horizontal)
	  (error "Failed to apply resizing %s" window))))
     (t
      (error "Cannot resize window %s" window)))))

(defun window-resize-no-error (window delta &optional horizontal ignore pixelwise)
  "Resize WINDOW vertically if it is resizable by DELTA lines.
This function is like `window-resize' but does not signal an
error when WINDOW cannot be resized.  For the meaning of the
optional arguments see the documentation of `window-resize'."
  (when (window--resizable-p
	 window delta horizontal ignore nil nil nil pixelwise)
    (window-resize window delta horizontal ignore pixelwise)))

(defun window--resize-child-windows-skip-p (window)
  "Return non-nil if WINDOW shall be skipped by resizing routines."
  (memq (window-new-normal window) '(ignore stuck skip)))

(defun window--resize-child-windows-normal (parent horizontal window this-delta &optional trail other-delta)
  "Recursively set new normal height of child windows of window PARENT.
HORIZONTAL non-nil means set the new normal width of these
windows.  WINDOW specifies a child window of PARENT that has been
resized by THIS-DELTA lines (columns).

Optional argument TRAIL either `before' or `after' means set values
only for windows before or after WINDOW.  Optional argument
OTHER-DELTA, a number, specifies that this many lines (columns)
have been obtained from (or returned to) an ancestor window of
PARENT in order to resize WINDOW."
  (let* ((delta-normal
	  (if (and (= (- this-delta)
		      (window-size window horizontal t))
		   (zerop other-delta))
	      ;; When WINDOW gets deleted and we can return its entire
	      ;; space to its siblings, use WINDOW's normal size as the
	      ;; normal delta.
	      (- (window-normal-size window horizontal))
	    ;; In any other case calculate the normal delta from the
	    ;; relation of THIS-DELTA to the total size of PARENT.
	    (/ (float this-delta)
	       (window-size parent horizontal t))))
	 (sub (window-child parent))
	 (parent-normal 0.0)
	 (skip (eq trail 'after)))

    ;; Set parent-normal to the sum of the normal sizes of all child
    ;; windows of PARENT that shall be resized, excluding only WINDOW
    ;; and any windows specified by the optional TRAIL argument.
    (while sub
      (cond
       ((eq sub window)
	(setq skip (eq trail 'before)))
       (skip)
       (t
	(setq parent-normal
	      (+ parent-normal (window-normal-size sub horizontal)))))
      (setq sub (window-right sub)))

    ;; Set the new normal size of all child windows of PARENT from what
    ;; they should have contributed for recovering THIS-DELTA lines
    ;; (columns).
    (setq sub (window-child parent))
    (setq skip (eq trail 'after))
    (while sub
      (cond
       ((eq sub window)
	(setq skip (eq trail 'before)))
       (skip)
       (t
	(let ((old-normal (window-normal-size sub horizontal)))
	  (set-window-new-normal
	   sub (min 1.0 ; Don't get larger than 1.
		    (max (- old-normal
			    (* (/ old-normal parent-normal)
			       delta-normal))
			 ;; Don't drop below 0.
			 0.0))))))
      (setq sub (window-right sub)))

    (when (numberp other-delta)
      ;; Set the new normal size of windows from what they should have
      ;; contributed for recovering OTHER-DELTA lines (columns).
      (setq delta-normal (/ (float (window-size parent horizontal t))
			    (+ (window-size parent horizontal t)
			       other-delta)))
      (setq sub (window-child parent))
      (setq skip (eq trail 'after))
      (while sub
	(cond
	 ((eq sub window)
	  (setq skip (eq trail 'before)))
	 (skip)
	 (t
	  (set-window-new-normal
	   sub (min 1.0 ; Don't get larger than 1.
		    (max (* (window-new-normal sub) delta-normal)
			 ;; Don't drop below 0.
			 0.0)))))
	(setq sub (window-right sub))))

    ;; Set the new normal size of WINDOW to what is left by the sum of
    ;; the normal sizes of its siblings.
    (set-window-new-normal
     window
     (let ((sum 0))
       (setq sub (window-child parent))
       (while sub
	 (cond
	  ((eq sub window))
	  ((not (numberp (window-new-normal sub)))
	   (setq sum (+ sum (window-normal-size sub horizontal))))
	  (t
	   (setq sum (+ sum (window-new-normal sub)))))
	 (setq sub (window-right sub)))
       ;; Don't get larger than 1 or smaller than 0.
       (min 1.0 (max (- 1.0 sum) 0.0))))))

(defun window--resize-child-windows (parent delta &optional horizontal window ignore trail edge char-size)
  "Resize child windows of window PARENT vertically by DELTA pixels.
PARENT must be a vertically combined internal window.

Optional argument HORIZONTAL non-nil means resize child windows
of PARENT horizontally by DELTA pixels.  In this case PARENT must
be a horizontally combined internal window.

WINDOW, if specified, must denote a child window of PARENT that
is resized by DELTA pixels.

The optional argument IGNORE has the same meaning as for
`window-resizable'.

Optional arguments TRAIL and EDGE, when non-nil, restrict the set
of windows that shall be resized.  If TRAIL equals `before',
resize only windows on the left or above EDGE.  If TRAIL equals
`after', resize only windows on the right or below EDGE.  Also,
preferably only resize windows adjacent to EDGE.

If the optional argument CHAR-SIZE is a positive integer, it specifies
the number of pixels by which windows are incrementally resized.
If CHAR-SIZE is nil, this means to use the value of
`frame-char-height' or `frame-char-width' of WINDOW's frame.

Return the symbol `normalized' if new normal sizes have been
already set by this routine."
  (let* ((first (window-child parent))
	 (last (window-last-child parent))
	 (parent-total (+ (window-size parent horizontal t)
			  delta))
	 (char-size (or char-size
			(and window-resize-pixelwise 1)
			(frame-char-size window horizontal)))
	 sub best-window best-value best-delta)

    (if (and edge (memq trail '(before after))
	     (progn
	       (setq sub first)
	       (while (and (window-right sub)
			   (or (and (eq trail 'before)
				    (not (window--resize-child-windows-skip-p
					  (window-right sub))))
			       (and (eq trail 'after)
				    (window--resize-child-windows-skip-p sub))))
		 (setq sub (window-right sub)))
	       sub)
	     (if horizontal
		 (if (eq trail 'before)
		     (= (+ (window-pixel-left sub) (window-pixel-width sub))
			edge)
		   (= (window-pixel-left sub) edge))
	       (if (eq trail 'before)
		   (= (+ (window-pixel-top sub) (window-pixel-height sub))
		      edge)
		 (= (window-pixel-top sub) edge)))
	     (window-sizable-p sub delta horizontal ignore t))
	;; Resize only windows adjacent to EDGE.
	(progn
	  (window--resize-this-window
	   sub delta horizontal ignore t trail edge)
	  (if (and window (eq (window-parent sub) parent))
	      (progn
		;; Assign new normal sizes.
		(set-window-new-normal
		 sub (/ (float (window-new-pixel sub)) parent-total))
		(set-window-new-normal
		 window (- (window-normal-size window horizontal)
			   (- (window-new-normal sub)
			      (window-normal-size sub horizontal)))))
	    (window--resize-child-windows-normal
	     parent horizontal sub 0 trail delta))
	  ;; Return 'normalized to notify `window--resize-siblings' that
	  ;; normal sizes have been already set.
	  'normalized)
      ;; Resize all windows proportionally.
      (setq sub last)
      (while sub
	(cond
	 ((or (window--resize-child-windows-skip-p sub)
	      ;; Ignore windows to skip and fixed-size child windows -
	      ;; in the latter case make it a window to skip.
	      (and (not ignore)
		   (window-size-fixed-p sub horizontal ignore)
		   (set-window-new-normal sub 'ignore))))
	 ((< delta 0)
	  ;; When shrinking store the number of lines/cols we can get
	  ;; from this window here together with the total/normal size
	  ;; factor.
	  (set-window-new-normal
	   sub
	   (cons
	    ;; We used to call this with NODOWN t, "fixed" 2011-05-11.
	    (window-min-delta sub horizontal ignore trail t nil t)
	    (- (/ (float (window-size sub horizontal t))
		  parent-total)
	       (window-normal-size sub horizontal)))))
	 ((> delta 0)
	  ;; When enlarging store the total/normal size factor only
	  (set-window-new-normal
	   sub
	   (- (/ (float (window-size sub horizontal t))
		 parent-total)
	      (window-normal-size sub horizontal)))))

	(setq sub (window-left sub)))

      (cond
       ((< delta 0)
	;; Shrink windows by delta.
	(setq best-window t)
	(while (and best-window (not (zerop delta)))
	  (setq sub last)
	  (setq best-window nil)
	  (setq best-value nil)
	  (while sub
	    (when (and (consp (window-new-normal sub))
		       (not (<= (car (window-new-normal sub)) 0))
		       (or (not best-value)
			   (> (cdr (window-new-normal sub)) best-value)))
	      (setq best-window sub)
	      (setq best-value (cdr (window-new-normal sub))))

	    (setq sub (window-left sub)))

	  (when best-window
	    (setq best-delta (min (car (window-new-normal best-window))
				  char-size (- delta)))
	    (setq delta (+ delta best-delta))
	    (set-window-new-pixel best-window (- best-delta) t)
	    (set-window-new-normal
	     best-window
	     (if (= (car (window-new-normal best-window)) best-delta)
		 'skip	    ; We can't shrink best-window any further.
	       (cons (- (car (window-new-normal best-window)) best-delta)
		     (- (/ (float (window-new-pixel best-window))
			   parent-total)
			(window-normal-size best-window horizontal))))))))
       ((> delta 0)
	;; Enlarge windows by delta.
	(setq best-window t)
	(while (and best-window (not (zerop delta)))
	  (setq sub last)
	  (setq best-window nil)
	  (setq best-value nil)
	  (while sub
	    (when (and (numberp (window-new-normal sub))
		       (or (not best-value)
		           (< (window-new-normal sub) best-value)))
	      (setq best-window sub)
	      (setq best-value (window-new-normal sub)))

	    (setq sub (window-left sub)))

	  (when best-window
	    (setq best-delta (min delta char-size))
	    (setq delta (- delta best-delta))
	    (set-window-new-pixel best-window best-delta t)
	    (set-window-new-normal
	     best-window
	     (- (/ (float (window-new-pixel best-window))
		   parent-total)
		(window-normal-size best-window horizontal)))))))

      (when best-window
	(setq sub last)
	(while sub
	  (when (or (consp (window-new-normal sub))
		    (numberp (window-new-normal sub)))
	    ;; Reset new normal size fields so `window-resize-apply'
	    ;; won't use them to apply new sizes.
	    (set-window-new-normal sub))

	  (unless (eq (window-new-normal sub) 'ignore)
	    ;; Resize this window's child windows (back-engineering
	    ;; delta from sub's old and new total sizes).
	    (let ((delta (- (window-new-pixel sub)
			    (window-size sub horizontal t))))
	      (unless (and (zerop delta) (not trail))
		;; For the TRAIL non-nil case we have to resize SUB
		;; recursively even if it's size does not change.
		(window--resize-this-window
		 sub delta horizontal ignore nil trail edge))))
	  (setq sub (window-left sub)))))))

(defun window--resize-siblings (window delta &optional horizontal ignore trail edge char-size)
  "Resize other windows when WINDOW is resized vertically by DELTA pixels.
Optional argument HORIZONTAL non-nil means resize other windows
when WINDOW is resized horizontally by DELTA pixels.  WINDOW
itself is not resized by this function.

The optional argument IGNORE has the same meaning as for
`window-resizable'.

Optional arguments TRAIL and EDGE, when non-nil, refine the set
of windows that shall be resized.  If TRAIL equals `before',
resize only windows on the left or above EDGE.  If TRAIL equals
`after', resize only windows on the right or below EDGE.  Also,
preferably only resize windows adjacent to EDGE."
  (when (window-parent window)
    (let* ((parent (window-parent window))
	   (sub (window-child parent)))
      (if (window-combined-p sub horizontal)
	  ;; In an iso-combination try to extract DELTA from WINDOW's
	  ;; siblings.
	  (let ((skip (eq trail 'after))
		this-delta other-delta)
	    ;; Decide which windows shall be left alone.
	    (while sub
	      (cond
	       ((eq sub window)
		;; Make sure WINDOW is left alone when
		;; resizing its siblings.
		(set-window-new-normal sub 'ignore)
		(setq skip (eq trail 'before)))
	       (skip
		;; Make sure this sibling is left alone when
		;; resizing its siblings.
		(set-window-new-normal sub 'ignore))
	       ((not (window-size-fixed-p sub horizontal ignore))
		;; Set this-delta to t to signal that we found a sibling
		;; of WINDOW whose size is not fixed.
		(setq this-delta t)))

	      (setq sub (window-right sub)))

	    ;; Set this-delta to what we can get from WINDOW's siblings.
	    (if (= (- delta) (window-size window horizontal t))
		;; A deletion, presumably.  We must handle this case
		;; specially since `window--resizable' can't be used.
		(if this-delta
		    ;; There's at least one resizable sibling we can
		    ;; give WINDOW's size to.
		    (setq this-delta delta)
		  ;; No resizable sibling exists.
		  (setq this-delta 0))
	      ;; Any other form of resizing.
	      (setq this-delta
		    (window--resizable
		     window delta horizontal ignore trail t nil t)))

	    ;; Set other-delta to what we still have to get from
	    ;; ancestor windows of parent.
	    (setq other-delta (- delta this-delta))
	    (unless (zerop other-delta)
	      ;; Unless we got everything from WINDOW's siblings, PARENT
	      ;; must be resized by other-delta lines or columns.
	      (set-window-new-pixel parent other-delta 'add))

	    (if (zerop this-delta)
		;; We haven't got anything from WINDOW's siblings but we
		;; must update the normal sizes to respect other-delta.
		(window--resize-child-windows-normal
		 parent horizontal window this-delta trail other-delta)
	      ;; We did get something from WINDOW's siblings which means
	      ;; we have to resize their child windows.
	      (unless (eq (window--resize-child-windows
			   parent (- this-delta) horizontal
			   window ignore trail edge char-size)
			  ;; If `window--resize-child-windows' returns
			  ;; 'normalized, this means it has set the
			  ;; normal sizes already.
			  'normalized)
		;; Set the normal sizes.
		(window--resize-child-windows-normal
		 parent horizontal window this-delta trail other-delta))
	      ;; Set DELTA to what we still have to get from ancestor
	      ;; windows.
	      (setq delta other-delta)))

	;; In an ortho-combination all siblings of WINDOW must be
	;; resized by DELTA.
	(set-window-new-pixel parent delta 'add)
	(while sub
	  (unless (eq sub window)
	    (window--resize-this-window
	     sub delta horizontal ignore t))
	  (setq sub (window-right sub))))

      (unless (zerop delta)
	;; "Go up."
	(window--resize-siblings
	 parent delta horizontal ignore trail edge char-size)))))

(defun window--resize-this-window (window delta &optional horizontal ignore add trail edge char-size)
  "Resize WINDOW vertically by DELTA pixels.
Optional argument HORIZONTAL non-nil means resize WINDOW
horizontally by DELTA pixels.

The optional argument IGNORE has the same meaning as for
`window-resizable'.  Optional argument ADD non-nil means add
DELTA to the new total size of WINDOW.

Optional arguments TRAIL and EDGE, when non-nil, refine the set
of windows that shall be resized.  If TRAIL equals `before',
resize only windows on the left or above EDGE.  If TRAIL equals
`after', resize only windows on the right or below EDGE.  Also,
preferably only resize windows adjacent to EDGE.

If the optional argument CHAR-SIZE is a positive integer, it specifies
the number of pixels by which windows are incrementally resized.
If CHAR-SIZE is nil, this means to use the value of
`frame-char-height' or `frame-char-width' of WINDOW's frame.

This function recursively resizes WINDOW's child windows to fit the
new size.  Make sure that WINDOW is `window--resizable' before
calling this function.  Note that this function does not resize
siblings of WINDOW or WINDOW's parent window.  You have to
eventually call `window-resize-apply' in order to make resizing
actually take effect."
  (when add
    ;; Add DELTA to the new total size of WINDOW.
    (set-window-new-pixel window delta t))

  (let ((sub (window-child window)))
    (cond
     ((not sub))
     ((window-combined-p sub horizontal)
      ;; In an iso-combination resize child windows according to their
      ;; normal sizes.
      (window--resize-child-windows
       window delta horizontal nil ignore trail edge char-size))
     ;; In an ortho-combination resize each child window by DELTA.
     (t
      (while sub
	(window--resize-this-window
	 sub delta horizontal ignore t trail edge char-size)
	(setq sub (window-right sub)))))))

(defun window--resize-root-window (window delta horizontal ignore pixelwise)
  "Resize root window WINDOW vertically by DELTA lines.
HORIZONTAL non-nil means resize root window WINDOW horizontally
by DELTA columns.

IGNORE non-nil means ignore any restrictions imposed by fixed
size windows, `window-min-height' or `window-min-width' settings.

This function is only called by the frame resizing routines.  It
resizes windows proportionally and never deletes any windows."
  (when (and (windowp window) (numberp delta))
    (let ((pixel-delta
	   (if pixelwise
	       delta
	     (window--size-to-pixel window delta horizontal))))
      (when (window-sizable-p window pixel-delta horizontal ignore t)
	(window--resize-reset (window-frame window) horizontal)
	(window--resize-this-window
	 window pixel-delta horizontal ignore t)))))

(defun window--resize-root-window-vertically (window delta pixelwise)
  "Resize root window WINDOW vertically by DELTA lines.
If DELTA is less than zero and we can't shrink WINDOW by DELTA
lines, shrink it as much as possible.  If DELTA is greater than
zero, this function can resize fixed-size windows in order to
recover the necessary lines.  Return the number of lines that
were recovered.

Third argument PIXELWISE non-nil means to interpret DELTA as
pixels and return the number of pixels that were recovered.

This function is called by the minibuffer window resizing
routines."
  (let* ((frame (window-frame window))
	 (pixel-delta
	  (cond
	   (pixelwise
	    delta)
	   ((numberp delta)
	    (* (frame-char-height frame) delta))
	   (t 0)))
	 ignore)
    (cond
     ((zerop pixel-delta))
     ((< pixel-delta 0)
      (setq pixel-delta (window-sizable window pixel-delta nil nil pixelwise))
      (window--resize-reset frame)
      ;; When shrinking the root window, emulate an edge drag in order
      ;; to not resize other windows if we can avoid it (Bug#12419).
      (window--resize-this-window
       window pixel-delta nil ignore t 'before
       (+ (window-pixel-top window) (window-pixel-height window)))
      ;; Don't record new normal sizes to make sure that shrinking back
      ;; proportionally works as intended.
      (walk-window-tree
       (lambda (window) (set-window-new-normal window 'ignore)) frame t))
     ((> pixel-delta 0)
      (window--resize-reset frame)
      (unless (window-sizable window pixel-delta nil nil pixelwise)
	(setq ignore t))
      ;; When growing the root window, resize proportionally.  This
      ;; should give windows back their original sizes (hopefully).
      (window--resize-this-window
       window pixel-delta nil ignore t)))
     ;; Return the possibly adjusted DELTA.
     (if pixelwise
	 pixel-delta
       (/ pixel-delta (frame-char-height frame)))))

(defun window--resize-mini-frame (frame)
  "Resize minibuffer-only frame FRAME."
  (if (functionp resize-mini-frames)
      (funcall resize-mini-frames frame)
    (fit-mini-frame-to-buffer frame)))

(defun window--sanitize-window-sizes (horizontal)
  "Assert that all windows on selected frame are large enough.
If necessary and possible, make sure that every window on frame
FRAME has its minimum height.  Optional argument HORIZONTAL
non-nil means to make sure that every window on frame FRAME has
its minimum width.  The minimum height/width of a window is the
respective value returned by `window-min-size' for that window.

Return t if all windows were resized appropriately.  Return nil
if at least one window could not be resized as requested, which
may happen when the FRAME is not large enough to accommodate it."
  (let ((value t))
    (walk-window-tree
     (lambda (window)
       (let  ((delta (- (window-min-size window horizontal nil t)
			(window-size window horizontal t))))
	 (when (> delta 0)
	   (if (window-resizable-p window delta horizontal nil t)
	       (window-resize window delta horizontal nil t)
	     (setq value nil)))))
     nil nil 'nomini)
    value))

(defun adjust-window-trailing-edge (window delta &optional horizontal pixelwise)
  "Move WINDOW's bottom edge by DELTA lines.
Optional argument HORIZONTAL non-nil means move WINDOW's right
edge by DELTA columns.  WINDOW must be a valid window and
defaults to the selected one.

Optional argument PIXELWISE non-nil means interpret DELTA as
number of pixels.

If DELTA is greater than zero, move the edge downwards or to the
right.  If DELTA is less than zero, move the edge upwards or to
the left.  If the edge can't be moved by DELTA lines or columns,
move it as far as possible in the desired direction."
  (setq window (window-normalize-window window))
  (let* ((frame (window-frame window))
	 (minibuffer-window (minibuffer-window frame))
	 (right window)
	 left first-left first-right this-delta min-delta max-delta ignore)

    (unless pixelwise
      (setq pixelwise t)
      (setq delta (* delta (frame-char-size window horizontal))))

    ;; Find the edge we want to move.
    (while (and (or (not (window-combined-p right horizontal))
		    (not (window-right right)))
		(setq right (window-parent right))))
    (cond
     ((and (not right) (not horizontal)
	   ;; Resize the minibuffer window if it's on the same frame as
	   ;; and immediately below WINDOW and it's either active or
	   ;; `resize-mini-windows' is nil.
	   (eq (window-frame minibuffer-window) frame)
	   (= (nth 1 (window-pixel-edges minibuffer-window))
	      (nth 3 (window-pixel-edges window)))
	   (or (not resize-mini-windows)
	       (eq minibuffer-window (active-minibuffer-window))))
      (window--resize-mini-window minibuffer-window (- delta)))
     ((or (not (setq left right)) (not (setq right (window-right right))))
      (if horizontal
	  (user-error "No window on the right of this one")
	(user-error "No window below this one")))
     (t
      ;; Set LEFT to the first resizable window on the left.  This step is
      ;; needed to handle fixed-size windows.
      (setq first-left left)
      (while (and left
		  (or (window-size-fixed-p left horizontal)
		      (and (< delta 0)
			   (<= (window-size left horizontal t)
			       (window-min-size left horizontal nil t)))))
	(setq left
	      (or (window-left left)
		  (progn
		    (while (and (setq left (window-parent left))
				(not (window-combined-p left horizontal))))
		    (window-left left)))))
      (unless left
	;; We have to resize a size-preserved window.  Start again with
	;; the window initially on the left.
	(setq ignore 'preserved)
	(setq left first-left)
	(while (and left
		    (or (window-size-fixed-p left horizontal 'preserved)
			(and (< delta 0)
                             (<= (window-size left horizontal t)
                                 (window-min-size
                                  left horizontal 'preserved t)))))
	  (setq left
		(or (window-left left)
		    (progn
		      (while (and (setq left (window-parent left))
				  (not (window-combined-p left horizontal))))
		      (window-left left)))))

	(unless left
	  (if horizontal
	      (user-error "No resizable window on the left of this one")
	    (user-error "No resizable window above this one"))))

      ;; Set RIGHT to the first resizable window on the right.  This step
      ;; is needed to handle fixed-size windows.
      (setq first-right right)
      (while (and right
		  (or (window-size-fixed-p right horizontal)
		      (and (> delta 0)
			   (<= (window-size right horizontal t)
			       (window-min-size
                                right horizontal 'preserved t)))))
	(setq right
	      (or (window-right right)
		  (progn
		    (while (and (setq right (window-parent right))
				(not (window-combined-p right horizontal))))
		    (window-right right)))))
      (unless right
	;; We have to resize a size-preserved window.  Start again with
	;; the window initially on the right.
	(setq ignore 'preserved)
	(setq right first-right)
	(while (and right
		    (or (window-size-fixed-p right horizontal 'preserved)
                        (and (> delta 0)
                             (<= (window-size right horizontal t)
                                 (window-min-size
                                  right horizontal 'preserved t)))))
	  (setq right
		(or (window-right right)
		    (progn
		      (while (and (setq right (window-parent right))
				  (not (window-combined-p right horizontal))))
		      (window-right right)))))
	(unless right
	  (if horizontal
	      (user-error "No resizable window on the right of this one")
	    (user-error "No resizable window below this one"))))

      ;; LEFT and RIGHT (which might be both internal windows) are now the
      ;; two windows we want to resize.
      (cond
       ((> delta 0)
	(setq max-delta
	      (window--max-delta-1
	       left 0 horizontal ignore 'after nil pixelwise))
	(setq min-delta
	      (window--min-delta-1
	       right (- delta) horizontal ignore 'before nil pixelwise))
	(when (or (< max-delta delta) (> min-delta (- delta)))
	  ;; We can't get the whole DELTA - move as far as possible.
	  (setq delta (min max-delta (- min-delta))))
	(unless (zerop delta)
	  ;; Start resizing.
	  (window--resize-reset frame horizontal)
	  ;; Try to enlarge LEFT first.
	  (setq this-delta
                (window--resizable
                 left delta horizontal ignore 'after nil nil pixelwise))
	  (unless (zerop this-delta)
	    (window--resize-this-window
	     left this-delta horizontal ignore t 'before
	     (if horizontal
		 (+ (window-pixel-left left) (window-pixel-width left))
	       (+ (window-pixel-top left) (window-pixel-height left)))))
	  ;; Shrink windows on right of LEFT.
	  (window--resize-siblings
	   left delta horizontal ignore 'after
	   (if horizontal
	       (window-pixel-left right)
	     (window-pixel-top right)))))
       ((< delta 0)
	(setq max-delta
	      (window--max-delta-1
	       right 0 horizontal ignore 'before nil pixelwise))
	(setq min-delta
	      (window--min-delta-1
	       left delta horizontal ignore 'after nil pixelwise))
	(when (or (< max-delta (- delta)) (> min-delta delta))
	  ;; We can't get the whole DELTA - move as far as possible.
	  (setq delta (max (- max-delta) min-delta)))
	(unless (zerop delta)
	  ;; Start resizing.
	  (window--resize-reset frame horizontal)
	  ;; Try to enlarge RIGHT.
	  (setq this-delta
		(window--resizable
		 right (- delta) horizontal ignore 'before nil nil pixelwise))
	  (unless (zerop this-delta)
	    (window--resize-this-window
	     right this-delta horizontal ignore t 'after
	     (if horizontal
		 (window-pixel-left right)
	       (window-pixel-top right))))
	  ;; Shrink windows on left of RIGHT.
	  (window--resize-siblings
	   right (- delta) horizontal ignore 'before
	   (if horizontal
	       (+ (window-pixel-left left) (window-pixel-width left))
	     (+ (window-pixel-top left) (window-pixel-height left)))))))
      (unless (zerop delta)
	;; Don't report an error in the standard case.
	(when (window--resize-apply-p frame horizontal)
	  (if (window-resize-apply frame horizontal)
	      (window--pixel-to-total frame horizontal)
	    ;; But do report an error if applying the changes fails.
	    (error "Failed adjusting window %s" window))))))))

(defun enlarge-window (delta &optional horizontal)
  "Make the selected window DELTA lines taller.
Interactively, if no argument is given, make the selected window
one line taller.  If optional argument HORIZONTAL is non-nil,
make selected window wider by DELTA columns.  If DELTA is
negative, shrink selected window by -DELTA lines or columns."
  (interactive "p")
  (let ((minibuffer-window (minibuffer-window)))
    (when (window-preserved-size nil horizontal)
      (window-preserve-size nil horizontal))
    (cond
     ((zerop delta))
     ((window-size-fixed-p nil horizontal)
      (user-error "Selected window has fixed size"))
     ((window-minibuffer-p)
      (if horizontal
	  (user-error "Cannot resize minibuffer window horizontally")
	(window--resize-mini-window
         (selected-window) (* delta (frame-char-height)))))
     ((and (not horizontal)
	   (window-full-height-p)
	   (eq (window-frame minibuffer-window) (selected-frame))
	   (not resize-mini-windows))
      ;; If the selected window is full height and `resize-mini-windows'
      ;; is nil, resize the minibuffer window.
      (window--resize-mini-window
       minibuffer-window (* (- delta) (frame-char-height))))
     ((window--resizable-p nil delta horizontal)
      (window-resize nil delta horizontal))
     ((window--resizable-p nil delta horizontal 'preserved)
      (window-resize nil delta horizontal 'preserved))
     ((eq this-command
	  (if horizontal 'enlarge-window-horizontally 'enlarge-window))
      ;; For backward compatibility don't signal an error unless this
      ;; command is `enlarge-window(-horizontally)'.
      (user-error "Cannot enlarge selected window"))
     (t
      (window-resize
       nil (if (> delta 0)
	       (window-max-delta nil horizontal)
	     (- (window-min-delta nil horizontal)))
       horizontal)))))

(defun shrink-window (delta &optional horizontal)
  "Make the selected window DELTA lines smaller.
Interactively, if no argument is given, make the selected window
one line smaller.  If optional argument HORIZONTAL is non-nil,
make selected window narrower by DELTA columns.  If DELTA is
negative, enlarge selected window by -DELTA lines or columns."
  (interactive "p")
  (let ((minibuffer-window (minibuffer-window)))
    (when (window-preserved-size nil horizontal)
      (window-preserve-size nil horizontal))
    (cond
     ((zerop delta))
     ((window-size-fixed-p nil horizontal)
      (user-error "Selected window has fixed size"))
     ((window-minibuffer-p)
      (if horizontal
	  (user-error "Cannot resize minibuffer window horizontally")
	(window--resize-mini-window
         (selected-window) (* (- delta) (frame-char-height)))))
     ((and (not horizontal)
	   (window-full-height-p)
	   (eq (window-frame minibuffer-window) (selected-frame))
	   (not resize-mini-windows))
      ;; If the selected window is full height and `resize-mini-windows'
      ;; is nil, resize the minibuffer window.
      (window--resize-mini-window
       minibuffer-window (* delta (frame-char-height))))
     ((window--resizable-p nil (- delta) horizontal)
      (window-resize nil (- delta) horizontal))
     ((window--resizable-p nil (- delta) horizontal 'preserved)
      (window-resize nil (- delta) horizontal 'preserved))
     ((eq this-command
	  (if horizontal 'shrink-window-horizontally 'shrink-window))
      ;; For backward compatibility don't signal an error unless this
      ;; command is `shrink-window(-horizontally)'.
      (user-error "Cannot shrink selected window"))
     (t
      (window-resize
       nil (if (> delta 0)
	       (- (window-min-delta nil horizontal))
	     (window-max-delta nil horizontal))
       horizontal)))))

(defun maximize-window (&optional window)
  "Maximize WINDOW.
Make WINDOW as large as possible without deleting any windows.
WINDOW must be a valid window and defaults to the selected one.

If the option `window-resize-pixelwise' is non-nil maximize
WINDOW pixelwise."
  (interactive)
  (setq window (window-normalize-window window))
  (window-resize
   window (window-max-delta window nil nil nil nil nil window-resize-pixelwise)
   nil nil window-resize-pixelwise)
  (window-resize
   window (window-max-delta window t nil nil nil nil window-resize-pixelwise)
   t nil window-resize-pixelwise))

(defun minimize-window (&optional window)
  "Minimize WINDOW.
Make WINDOW as small as possible without deleting any windows.
WINDOW must be a valid window and defaults to the selected one.

If the option `window-resize-pixelwise' is non-nil minimize
WINDOW pixelwise."
  (interactive)
  (setq window (window-normalize-window window))
  (window-resize
   window
   (- (window-min-delta window nil nil nil nil nil window-resize-pixelwise))
   nil nil window-resize-pixelwise)
  (window-resize
   window
   (- (window-min-delta window t nil nil nil nil window-resize-pixelwise))
   t nil window-resize-pixelwise))
\f
;;; Window edges
(defun window-edges (&optional window body absolute pixelwise)
  "Return a list of the edge distances of WINDOW.
WINDOW must be a valid window and defaults to the selected one.
The list returned has the form (LEFT TOP RIGHT BOTTOM).

If the optional argument BODY is nil, this means to return the
edges corresponding to the total size of WINDOW.  BODY non-nil
means to return the edges of WINDOW's body (aka text area).  If
BODY is non-nil, WINDOW must specify a live window.

Optional argument ABSOLUTE nil means to return edges relative to
the position of WINDOW's native frame.  ABSOLUTE non-nil means to
return coordinates relative to the origin - the position (0, 0) -
of FRAME's display.  On non-graphical systems this argument has
no effect.

Optional argument PIXELWISE nil means to return the coordinates
in terms of the canonical character width and height of WINDOW's
frame, rounded if necessary.  PIXELWISE non-nil means to return
the coordinates in pixels where the values for RIGHT and BOTTOM
are one more than the actual value of these edges.  Note that if
ABSOLUTE is non-nil, PIXELWISE is implicitly non-nil too."
  (let* ((window (window-normalize-window window body))
	 (frame (window-frame window))
	 (border-width (frame-internal-border-width frame))
	 (char-width (frame-char-width frame))
	 (char-height (frame-char-height frame))
	 (left (if pixelwise
		   (+ (window-pixel-left window) border-width)
		 (+ (window-left-column window)
		    (/ border-width char-width))))
	 (left-body
	  (when body
	    (+ (window-pixel-left window) border-width
	       (if (eq (car (window-current-scroll-bars window)) 'left)
		   (window-scroll-bar-width window)
		 0)
	       (nth 0 (window-fringes window))
	       (* (or (nth 0 (window-margins window)) 0) char-width))))
	 (top (if pixelwise
		  (+ (window-pixel-top window) border-width)
		(+ (window-top-line window)
		   (/ border-width char-height))))
	 (top-body
	  (when body
	    (+ (window-pixel-top window) border-width
	       (window-header-line-height window))))
	 (right (+ left (if pixelwise
			    (window-pixel-width window)
			  (window-total-width window))))
	 (right-body (and body (+ left-body (window-body-width window t))))
	 (bottom (+ top (if pixelwise
			    (window-pixel-height window)
			  (window-total-height window))))
	 (bottom-body (and body (+ top-body (window-body-height window t)))))
    (if absolute
	(let* ((native-edges (frame-edges frame 'native-edges))
	       (left-off (nth 0 native-edges))
	       (top-off (nth 1 native-edges)))
	      (if body
		  (list (+ left-body left-off) (+ top-body top-off)
			(+ right-body left-off) (+ bottom-body top-off))
		(list (+ left left-off) (+ top top-off)
		      (+ right left-off) (+ bottom top-off))))
      (if body
	  (if pixelwise
	      (list left-body top-body right-body bottom-body)
	    (list (/ left-body char-width) (/ top-body char-height)
		  ;; Round up.
		  (/ (+ right-body char-width -1) char-width)
		  (/ (+ bottom-body char-height -1) char-height)))
	(list left top right bottom)))))

(defun window-body-edges (&optional window)
  "Return a list of the edge coordinates of WINDOW's body.
The return value is that of `window-edges' called with argument
BODY non-nil."
  (window-edges window t))
(defalias 'window-inside-edges 'window-body-edges)

(defun window-pixel-edges (&optional window)
  "Return a list of the edge pixel coordinates of WINDOW.
The return value is that of `window-edges' called with argument
PIXELWISE non-nil."
  (window-edges window nil nil t))

(defun window-body-pixel-edges (&optional window)
  "Return a list of the edge pixel coordinates of WINDOW's body.
The return value is that of `window-edges' called with arguments
BODY and PIXELWISE non-nil."
  (window-edges window t nil t))
(defalias 'window-inside-pixel-edges 'window-body-pixel-edges)

(defun window-absolute-pixel-edges (&optional window)
  "Return a list of the edge pixel coordinates of WINDOW.
The return value is that of `window-edges' called with argument
ABSOLUTE non-nil."
  (window-edges window nil t t))

(defun window-absolute-body-pixel-edges (&optional window)
  "Return a list of the edge pixel coordinates of WINDOW's text area.
The return value is that of `window-edges' called with arguments
BODY and ABSOLUTE non-nil."
  (window-edges window t t t))
(defalias 'window-inside-absolute-pixel-edges 'window-absolute-body-pixel-edges)

(defun window-absolute-pixel-position (&optional position window)
  "Return display coordinates of POSITION in WINDOW.
If the buffer position POSITION is visible in window WINDOW,
return the display coordinates of the upper/left corner of the
glyph at POSITION.  The return value is a cons of the X- and
Y-coordinates of that corner, relative to an origin at (0, 0) of
WINDOW's display.  Return nil if POSITION is not visible in
WINDOW.

WINDOW must be a live window and defaults to the selected window.
POSITION defaults to the value of `window-point' of WINDOW."
  (let* ((window (window-normalize-window window t))
	 (pos-in-window
	  (pos-visible-in-window-p
	   (or position (window-point window)) window t)))
    (when pos-in-window
      (let ((edges (window-absolute-body-pixel-edges window)))
	(cons (+ (nth 0 edges) (nth 0 pos-in-window))
	      (+ (nth 1 edges) (nth 1 pos-in-window)))))))
\f
(defun frame-root-window-p (window)
  "Return t if WINDOW is the root window of its frame."
  (eq window (frame-root-window window)))

(defun window--subtree (window &optional next)
  "Return window subtree rooted at WINDOW.
Optional argument NEXT non-nil means include WINDOW's right
siblings in the return value.

See the documentation of `window-tree' for a description of the
return value."
  (let (list)
    (while window
      (setq list
	    (cons
	     (cond
	      ((window-top-child window)
	       (cons t (cons (window-edges window)
			     (window--subtree (window-top-child window) t))))
	      ((window-left-child window)
	       (cons nil (cons (window-edges window)
			       (window--subtree (window-left-child window) t))))
	      (t window))
	     list))
      (setq window (when next (window-next-sibling window))))
    (nreverse list)))

(defun window-tree (&optional frame)
  "Return the window tree of frame FRAME.
FRAME must be a live frame and defaults to the selected frame.
The return value is a list of the form (ROOT MINI), where ROOT
represents the window tree of the frame's root window, and MINI
is the frame's minibuffer window.

If the root window is not split, ROOT is the root window itself.
Otherwise, ROOT is a list (DIR EDGES W1 W2 ...) where DIR is nil
for a horizontal split, and t for a vertical split.  EDGES gives
the combined size and position of the child windows in the split,
and the rest of the elements are the child windows in the split.
Each of the child windows may again be a window or a list
representing a window split, and so on.  EDGES is a list (LEFT
TOP RIGHT BOTTOM) as returned by `window-edges'."
  (setq frame (window-normalize-frame frame))
  (window--subtree (frame-root-window frame) t))
\f
(defun other-window (count &optional all-frames interactive)
  "Select another window in cyclic ordering of windows.
COUNT specifies the number of windows to skip, starting with the
selected window, before making the selection.  If COUNT is
positive, skip COUNT windows forwards.  If COUNT is negative,
skip -COUNT windows backwards.  COUNT zero means do not skip any
window, so select the selected window.  In an interactive call,
COUNT is the numeric prefix argument.  Return nil.

If the `other-window' parameter of the selected window is a
function and `ignore-window-parameters' is nil, call that
function with the arguments COUNT and ALL-FRAMES.

This function does not select a window whose `no-other-window'
window parameter is non-nil.

This function uses `next-window' for finding the window to
select.  The argument ALL-FRAMES has the same meaning as in
`next-window', but the MINIBUF argument of `next-window' is
always effectively nil."
  (interactive "p\ni\np")
  (let* ((window (selected-window))
         (original-window window)
	 (function (and (not ignore-window-parameters)
			(window-parameter window 'other-window)))
	 old-window old-count)
    (if (functionp function)
	(funcall function count all-frames)
      ;; `next-window' and `previous-window' may return a window we are
      ;; not allowed to select.  Hence we need an exit strategy in case
      ;; all windows are non-selectable.
      (catch 'exit
	(while (> count 0)
	  (setq window (next-window window nil all-frames))
	  (cond
	   ((eq window old-window)
	    (when (= count old-count)
	      ;; Keep out of infinite loops.  When COUNT has not changed
	      ;; since we last looked at `window' we're probably in one.
	      (throw 'exit nil)))
	   ((window-parameter window 'no-other-window)
	    (unless old-window
	      ;; The first non-selectable window `next-window' got us:
	      ;; Remember it and the current value of COUNT.
	      (setq old-window window)
	      (setq old-count count)))
	   (t
	    (setq count (1- count)))))
	(while (< count 0)
	  (setq window (previous-window window nil all-frames))
	  (cond
	   ((eq window old-window)
	    (when (= count old-count)
	      ;; Keep out of infinite loops.  When COUNT has not changed
	      ;; since we last looked at `window' we're probably in one.
	      (throw 'exit nil)))
	   ((window-parameter window 'no-other-window)
	    (unless old-window
	      ;; The first non-selectable window `previous-window' got
	      ;; us: Remember it and the current value of COUNT.
	      (setq old-window window)
	      (setq old-count count)))
	   (t
	    (setq count (1+ count)))))

        (when (and (eq window original-window)
                   interactive
                   (not (or executing-kbd-macro noninteractive)))
          (message "No other window to select"))

	(select-window window)
	;; Always return nil.
	nil))))

(defun other-window-prefix ()
  "Display the buffer of the next command in a new window.
The next buffer is the buffer displayed by the next command invoked
immediately after this command (ignoring reading from the minibuffer).
Creates a new window before displaying the buffer.
When `switch-to-buffer-obey-display-actions' is non-nil,
`switch-to-buffer' commands are also supported."
  (interactive)
  (display-buffer-override-next-command
   (lambda (buffer alist)
     (let ((alist (append '((inhibit-same-window . t)) alist))
           window type)
       (if (setq window (display-buffer-pop-up-window buffer alist))
           (setq type 'window)
         (setq window (display-buffer-use-some-window buffer alist)
               type 'reuse))
       (cons window type)))
   nil "[other-window]")
  (message "Display next command buffer in a new window..."))

(defun same-window-prefix ()
  "Display the buffer of the next command in the same window.
The next buffer is the buffer displayed by the next command invoked
immediately after this command (ignoring reading from the minibuffer).
Even when the default rule should display the buffer in a new window,
force its display in the already selected window.
When `switch-to-buffer-obey-display-actions' is non-nil,
`switch-to-buffer' commands are also supported."
  (interactive)
  (display-buffer-override-next-command
   (lambda (buffer alist)
     (setq alist (append '((inhibit-same-window . nil)) alist))
     (cons (or
            (display-buffer-same-window buffer alist)
            (display-buffer-use-some-window buffer alist))
           'reuse))
   nil "[same-window]")
  (message "Display next command buffer in the same window..."))

;; This should probably return non-nil when the selected window is part
;; of an atomic window whose root is the frame's root window.
(defun one-window-p (&optional nomini all-frames)
  "Return non-nil if the selected window is the only window.
Optional arg NOMINI non-nil means don't count the minibuffer
even if it is active.  Otherwise, the minibuffer is counted
when it is active.

Optional argument ALL-FRAMES specifies the set of frames to
consider, see also `next-window'.  ALL-FRAMES nil or omitted
means consider windows on the selected frame only, plus the
minibuffer window if specified by the NOMINI argument.  If the
minibuffer counts, consider all windows on all frames that share
that minibuffer too.  The remaining non-nil values of ALL-FRAMES
with a special meaning are:

- t means consider all windows on all existing frames.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Anything else means consider all windows on the selected frame
and no others."
  (let ((base-window (selected-window)))
    (if (and nomini (eq base-window (minibuffer-window)))
	(setq base-window (next-window base-window)))
    (eq base-window
	(next-window base-window (if nomini 'arg) all-frames))))
\f
;;; Deleting windows.
(defun window-deletable-p (&optional window)
  "Return t if WINDOW can be safely deleted from its frame.
WINDOW must be a valid window and defaults to the selected one.

Return `frame' if WINDOW is the root window of its frame and that
frame can be safely deleted."
  (setq window (window-normalize-window window))

  (unless (or ignore-window-parameters
	      (eq (window-parameter window 'delete-window) t))
    ;; Handle atomicity.
    (when (window-parameter window 'window-atom)
      (setq window (window-atom-root window))))

  (let ((frame (window-frame window)))
    (cond
     ((frame-root-window-p window)
      ;; WINDOW's frame can be deleted only if there are other frames
      ;; on the same terminal, and it does not contain the active
      ;; minibuffer.
      (unless (or (eq frame (next-frame frame 0))
		  ;; We can delete our frame only if no other frame
		  ;; currently uses our minibuffer window.
		  (catch 'other
		    (dolist (other (frame-list))
		      (when (and (not (eq other frame))
				 (eq (window-frame (minibuffer-window other))
				     frame))
			(throw 'other t))))
		  (let ((minibuf (active-minibuffer-window)))
		    (and minibuf (eq frame (window-frame minibuf))
                         (not (eq (default-toplevel-value
                                    'minibuffer-follows-selected-frame)
                                  t)))))
	'frame))
     ((window-minibuffer-p window)
      ;; If WINDOW is the minibuffer window of a non-minibuffer-only
      ;; frame, it cannot be deleted separately.
      nil)
     ((or ignore-window-parameters
	  (not (eq window (window-main-window frame))))
      ;; Otherwise, WINDOW can be deleted unless it is the main window
      ;; of its frame.
      t))))

(defun window--in-subtree-p (window root)
  "Return t if WINDOW is either ROOT or a member of ROOT's subtree."
  (or (eq window root)
      (let ((parent (window-parent window)))
	(catch 'done
	  (while parent
	    (if (eq parent root)
		(throw 'done t)
	      (setq parent (window-parent parent))))))))

(defun delete-window (&optional window)
  "Delete WINDOW.
WINDOW must be a valid window and defaults to the selected one.
Return nil.

If the variable `ignore-window-parameters' is non-nil or the
`delete-window' parameter of WINDOW equals t, do not process any
parameters of WINDOW.  Otherwise, if the `delete-window'
parameter of WINDOW specifies a function, call that function with
WINDOW as its sole argument and return the value returned by that
function.

Otherwise, if WINDOW is part of an atomic window, call
`delete-window' with the root of the atomic window as its
argument.  Signal an error if WINDOW is either the only window on
its frame, the last non-side window, or part of an atomic window
that is its frame's root window."
  (interactive)
  (setq window (window-normalize-window window))
  (let* ((frame (window-frame window))
	 (function (window-parameter window 'delete-window))
	 (parent (window-parent window))
	 atom-root)
    (window--check frame)
    (catch 'done
      ;; Handle window parameters.
      (cond
       ;; Ignore window parameters if `ignore-window-parameters' tells
       ;; us so or `delete-window' equals t.
       ((or ignore-window-parameters (eq function t)))
       ((functionp function)
	;; The `delete-window' parameter specifies the function to call.
	;; If that function is `ignore' nothing is done.  It's up to the
	;; function called here to avoid infinite recursion.
	(throw 'done (funcall function window)))
       ((and (window-parameter window 'window-atom)
	     (setq atom-root (window-atom-root window))
	     (not (eq atom-root window)))
	(if (eq atom-root (frame-root-window frame))
	    (error "Root of atomic window is root window of its frame")
	  (throw 'done (delete-window atom-root))))
       ((not parent)
	(error "Attempt to delete minibuffer or sole ordinary window"))
       ((eq window (window-main-window frame))
	(error "Attempt to delete main window of frame %s" frame)))

      (let* ((horizontal (window-left-child parent))
	     (size (window-size window horizontal t))
             (window-combination-resize
              (or window-combination-resize
                  (window-parameter parent 'window-side)))
	     (frame-selected
	      (window--in-subtree-p (frame-selected-window frame) window))
	     ;; Emacs 23 preferably gives WINDOW's space to its left
	     ;; sibling.
	     (sibling (or (window-left window) (window-right window))))
	(window--resize-reset frame horizontal)
	(cond
	 ((and (not (eq window-combination-resize t))
	       sibling (window-sizable-p sibling size horizontal nil t))
	  ;; Resize WINDOW's sibling.
	  (window--resize-this-window sibling size horizontal nil t)
	  (set-window-new-normal
	   sibling (+ (window-normal-size sibling horizontal)
		      (window-normal-size window horizontal))))
	 ((window--resizable-p window (- size) horizontal nil nil nil t t)
	  ;; Can do without resizing fixed-size windows.
	  (window--resize-siblings window (- size) horizontal))
	 (t
	  ;; Can't do without resizing fixed-size windows.
	  (window--resize-siblings window (- size) horizontal t)))
	;; Actually delete WINDOW.
	(delete-window-internal window)
	(window--pixel-to-total frame horizontal)
	(when (and frame-selected
		   (window-parameter
		    (frame-selected-window frame) 'no-other-window))
	  ;; `delete-window-internal' has selected a window that should
	  ;; not be selected, fix this here.
	  (other-window -1 frame))
	(window--check frame)
	;; Always return nil.
	nil))))

(defun delete-other-windows (&optional window interactive)
  "Make WINDOW fill its frame.
WINDOW must be a valid window and defaults to the selected one.
Return nil.

If the variable `ignore-window-parameters' is non-nil or the
`delete-other-windows' parameter of WINDOW equals t, do not pay
attention to any other parameters of WINDOW.  Otherwise, if the
`delete-other-windows' parameter of WINDOW specifies a function,
call that function with WINDOW as its sole argument and return
the value returned by that function.

Else, if WINDOW is part of an atomic window, call this function
with the root of the atomic window as its argument.  Signal an
error if that root window is the root window of WINDOW's frame.
Also signal an error if WINDOW is a side window.  Do not delete
any window whose `no-delete-other-windows' parameter is non-nil."
  (interactive "i\np")
  (setq window (window-normalize-window window))
  (let* ((frame (window-frame window))
	 (function (window-parameter window 'delete-other-windows))
	 atom-root main)
    (window--check frame)
    (catch 'done
      (cond
       ;; Ignore window parameters if `ignore-window-parameters' is t or
       ;; `delete-other-windows' is t.
       ((or ignore-window-parameters (eq function t)))
       ((functionp function)
	;; The `delete-other-windows' parameter specifies the function
	;; to call.  If the function is `ignore' no windows are deleted.
	;; It's up to the function called to avoid infinite recursion.
	(throw 'done (funcall function window)))
       ((and (window-parameter window 'window-atom)
	     (setq atom-root (window-atom-root window))
	     (not (eq atom-root window)))
	(if (eq atom-root (frame-root-window frame))
	    (error "Root of atomic window is root window of its frame")
	  (throw 'done (delete-other-windows atom-root))))
       ((window-parameter window 'window-side)
	(error "Cannot make side window the only window"))
       ((and (window-minibuffer-p window)
	     (not (eq window (frame-root-window window))))
	(error "Can't expand minibuffer to full frame")))

      (cond
       ((or ignore-window-parameters
            (not (window-with-parameter 'no-delete-other-windows nil frame)))
        (setq main (frame-root-window frame)))
       ((catch 'tag
          (walk-window-tree
           (lambda (other)
             (when (or (and (window-parameter other 'window-side)
                            (not (window-parameter
                                  other 'no-delete-other-windows)))
                       (and (not (window-parameter other 'window-side))
                            (window-parameter
                             other 'no-delete-other-windows)))
               (throw 'tag nil)))
           nil nil 'nomini)
          t)
        (setq main (window-main-window frame)))
       (t
        ;; Delete windows via `delete-window' because we found either a
        ;; deletable side window or a non-deletable non-side-window.
        (dolist (other (window-list frame))
          (when (and (window-live-p other)
                     (not (eq other window))
                     (not (window-parameter
                           other 'no-delete-other-windows))
                     ;; When WINDOW and the other window are part of the
                     ;; same atomic window, don't delete the other.
                     (or (not atom-root)
                         (not (eq (window-atom-root other) atom-root))))
            (condition-case nil
                (delete-window other)
              (error nil))))
        (throw 'done nil)))

      ;; If WINDOW is the main window of its frame do nothing.
      (if (eq window main)
          ;; Give a message to the user if this has been called as a
          ;; command.
          (when (and interactive
                     (not (or executing-kbd-macro noninteractive)))
            (message "No other windows to delete"))
	(delete-other-windows-internal window main)
	(window--check frame))
      ;; Always return nil.
      nil)))

(defun delete-other-windows-vertically (&optional window)
  "Delete the windows in the same column with WINDOW, but not WINDOW itself.
This may be a useful alternative binding for \\[delete-other-windows]
 if you often split windows horizontally."
  (interactive)
  (let* ((window (or window (selected-window)))
         (edges (window-edges window))
         (w window) delenda)
    (while (not (eq (setq w (next-window w 1)) window))
      (let ((e (window-edges w)))
        (when (and (= (car e) (car edges))
                   (= (nth 2 e) (nth 2 edges)))
          (push w delenda))))
    (mapc 'delete-window delenda)))

;;; Windows and buffers.

;; `prev-buffers' and `next-buffers' are two reserved window slots used
;; for (1) determining which buffer to show in the window when its
;; buffer shall be buried or killed and (2) which buffer to show for
;; `switch-to-prev-buffer' and `switch-to-next-buffer'.

;; `prev-buffers' consists of <buffer, window-start, window-point>
;; triples.  The entries on this list are ordered by the time their
;; buffer has been removed from the window, the most recently removed
;; buffer's entry being first.  The window-start and window-point
;; components are `window-start' and `window-point' at the time the
;; buffer was removed from the window which implies that the entry must
;; be added when `set-window-buffer' removes the buffer from the window.

;; `next-buffers' is the list of buffers that have been replaced
;; recently by `switch-to-prev-buffer'.  These buffers are the least
;; preferred candidates of `switch-to-prev-buffer' and the preferred
;; candidates of `switch-to-next-buffer' to switch to.  This list is
;; reset to nil by any action changing the window's buffer with the
;; exception of `switch-to-prev-buffer' and `switch-to-next-buffer'.
;; `switch-to-prev-buffer' pushes the buffer it just replaced on it,
;; `switch-to-next-buffer' pops the last pushed buffer from it.

;; Both `prev-buffers' and `next-buffers' may reference killed buffers
;; if such a buffer was killed while the window was hidden within a
;; window configuration.  Such killed buffers get removed whenever
;; `switch-to-prev-buffer' or `switch-to-next-buffer' encounter them.

;; The following function is called by `set-window-buffer' _before_ it
;; replaces the buffer of the argument window with the new buffer.
(defun push-window-buffer-onto-prev (&optional window)
  "Push entry for WINDOW's buffer onto WINDOW's prev-buffers list.
WINDOW must be a live window and defaults to the selected one.

Any duplicate entries for the buffer in the list are removed."
  (let* ((window (window-normalize-window window t))
         (buffer (window-buffer window))
         (w-list (window-prev-buffers window))
         (entry (assq buffer w-list)))
    (when entry
      (setq w-list (assq-delete-all buffer w-list)))
    (let ((start (window-start window))
          (point (window-point window)))
      (setq entry
            (cons buffer
                  (with-current-buffer buffer
                    (if entry
                        ;; We have an entry, update marker positions.
                        (list (set-marker (nth 1 entry) start)
                              (set-marker (nth 2 entry) point))
                      (list (copy-marker start)
                            (copy-marker
                             ;; Preserve window-point-insertion-type
                             ;; (Bug#12855)
                             point window-point-insertion-type))))))
      (set-window-prev-buffers window (cons entry w-list)))))

(defun record-window-buffer (&optional window)
  "Record WINDOW's buffer.
WINDOW must be a live window and defaults to the selected one."
  (let* ((window (window-normalize-window window t))
         (buffer (window-buffer window)))
    ;; Reset WINDOW's next buffers.  If needed, they are resurrected by
    ;; `switch-to-prev-buffer' and `switch-to-next-buffer'.
    (set-window-next-buffers window nil)

    ;; Don't record insignificant buffers.
    (when (not (eq (aref (buffer-name buffer) 0) ?\s))
      (push-window-buffer-onto-prev window)
      (run-hooks 'buffer-list-update-hook))))

(defun unrecord-window-buffer (&optional window buffer)
  "Unrecord BUFFER in WINDOW.
WINDOW must be a live window and defaults to the selected one.
BUFFER must be a live buffer and defaults to the buffer of
WINDOW."
  (let* ((window (window-normalize-window window t))
	 (buffer (or buffer (window-buffer window))))
    (set-window-prev-buffers
     window (assq-delete-all buffer (window-prev-buffers window)))
    (set-window-next-buffers
     window (delq buffer (window-next-buffers window)))))

(defun set-window-buffer-start-and-point (window buffer &optional start point)
  "Set WINDOW's buffer to BUFFER.
WINDOW must be a live window and defaults to the selected one.
Optional argument START non-nil means set WINDOW's start position
to START.  Optional argument POINT non-nil means set WINDOW's
point to POINT.  If WINDOW is selected this also sets BUFFER's
`point' to POINT.  If WINDOW is selected and the buffer it showed
before was current this also makes BUFFER the current buffer."
  (setq window (window-normalize-window window t))
  (let ((selected (eq window (selected-window)))
	(current (eq (window-buffer window) (current-buffer))))
    (set-window-buffer window buffer)
    (when (and selected current)
      (set-buffer buffer))
    (when start
      ;; Don't force window-start here (even if POINT is nil).
      (set-window-start window start t))
    (when point
      (set-window-point window point))))

(defcustom switch-to-visible-buffer t
  "If non-nil, allow switching to an already visible buffer.
If this variable is non-nil, `switch-to-prev-buffer' and
`switch-to-next-buffer' may switch to an already visible buffer.
If this variable is nil, `switch-to-prev-buffer' and
`switch-to-next-buffer' always try to avoid switching to a buffer
that is already visible in another window on the same frame."
  :type 'boolean
  :version "24.1"
  :group 'windows)

(make-obsolete-variable 'switch-to-visible-buffer
                        'switch-to-prev-buffer-skip "27.1")

(defcustom switch-to-prev-buffer-skip nil
  "Buffers `switch-to-prev-buffer' should skip.
If this variable is nil, `switch-to-prev-buffer' may switch to
any buffer, including those already shown in other windows.

If this variable is non-nil, `switch-to-prev-buffer' will refrain
from switching to certain buffers according to the value of this
variable:

- `this' means do not switch to a buffer shown on the frame that
  hosts the window `switch-to-prev-buffer' is acting upon.

- `visible' means do not switch to a buffer shown on any visible
  frame.

- 0 (the number zero) means do not switch to a buffer shown on
  any visible or iconified frame.

- t means do not switch to a buffer shown on any live frame.

If this option specifies a function, that function is called with
three arguments - the WINDOW argument of `switch-to-prev-buffer',
a buffer `switch-to-prev-buffer' intends to switch to and the
BURY-OR-KILL argument of `switch-to-prev-buffer'.  If that
function returns non-nil, `switch-to-prev-buffer' will not switch
to that buffer.

Since `switch-to-prev-buffer' is called by `bury-buffer',
`replace-buffer-in-windows' and `quit-restore-window' among
others, customizing this option may also affect the behavior of
Emacs when a window is quit or a buffer gets buried or killed.

The value of this option is consulted by `switch-to-next-buffer'
as well.  In that case, if this option specifies a function, it
will be called with the third argument nil.

Under certain circumstances `switch-to-prev-buffer' may ignore
this option, for example, when there is only one buffer left."
  :type
  '(choice (const :tag "Never" nil)
           (const :tag "This frame" this)
	   (const :tag "Visible frames" visible)
	   (const :tag "Visible and iconified frames" 0)
	   (const :tag "Any frame" t)
           (function :tag "Function"))
  :version "27.1"
  :group 'windows)

(defun switch-to-prev-buffer-skip-p (skip window buffer &optional bury-or-kill)
  "Return non-nil if `switch-to-prev-buffer' should skip BUFFER.
SKIP is a value derived from `switch-to-prev-buffer-skip', WINDOW
the window `switch-to-prev-buffer' acts upon.  Optional argument
BURY-OR-KILL is passed unchanged by `switch-to-prev-buffer' and
omitted in calls from `switch-to-next-buffer'."
  (when skip
    (if (functionp skip)
        (funcall skip window buffer bury-or-kill)
      (get-buffer-window buffer skip))))

(defun switch-to-prev-buffer (&optional window bury-or-kill)
  "In WINDOW switch to previous buffer.
WINDOW must be a live window and defaults to the selected one.
Return the buffer switched to, nil if no suitable buffer could be
found.

Optional argument BURY-OR-KILL non-nil means the buffer currently
shown in WINDOW is about to be buried or killed and consequently
shall not be switched to in future invocations of this command.

As a special case, if BURY-OR-KILL equals `append', this means to
move the buffer to the end of WINDOW's previous buffers list so a
future invocation of `switch-to-prev-buffer' less likely switches
to it.

The option `switch-to-prev-buffer-skip' can be used to not switch
to certain buffers, for example, to those already shown in
another window.  Also, if WINDOW's frame has a `buffer-predicate'
parameter, that predicate may inhibit switching to certain
buffers.

This function is called by `prev-buffer'."
  (interactive)
  (let* ((window (window-normalize-window window t))
	 (frame (window-frame window))
         (window-side (window-parameter window 'window-side))
	 (old-buffer (window-buffer window))
	 ;; Save this since it's destroyed by `set-window-buffer'.
	 (next-buffers (window-next-buffers window))
         (pred (frame-parameter frame 'buffer-predicate))
         (skip
          (cond
           ((or (functionp switch-to-prev-buffer-skip)
                (memq switch-to-prev-buffer-skip '(t visible 0)))
            switch-to-prev-buffer-skip)
           ((or switch-to-prev-buffer-skip
                (not switch-to-visible-buffer))
            frame)))
         entry new-buffer killed-buffers skipped)
    (when (window-minibuffer-p window)
      ;; Don't switch in minibuffer window.
      (unless (setq window (minibuffer-selected-window))
	(error "Window %s is a minibuffer window" window)))

    (unless (memq (window-dedicated-p window) '(nil side))
      ;; Don't switch in dedicated window.
      (error "Window %s is dedicated to buffer %s" window old-buffer))

    (catch 'found
      ;; Scan WINDOW's previous buffers first, skipping entries of next
      ;; buffers.
      (dolist (entry (window-prev-buffers window))
	(when (and (not (eq (car entry) old-buffer))
                   (setq new-buffer (car entry))
		   (or (buffer-live-p new-buffer)
		       (not (setq killed-buffers
				  (cons new-buffer killed-buffers))))
                   (or (null pred) (funcall pred new-buffer))
		   ;; When BURY-OR-KILL is nil, avoid switching to a
		   ;; buffer in WINDOW's next buffers list.
		   (or bury-or-kill (not (memq new-buffer next-buffers))))
          (if (switch-to-prev-buffer-skip-p skip window new-buffer bury-or-kill)
	      (setq skipped new-buffer)
	    (set-window-buffer-start-and-point
	     window new-buffer (nth 1 entry) (nth 2 entry))
	    (throw 'found t))))
      ;; Scan reverted buffer list of WINDOW's frame next, skipping
      ;; entries of next buffers.  Note that when we bury or kill a
      ;; buffer we don't reverse the global buffer list to avoid showing
      ;; a buried buffer instead.  Otherwise, we must reverse the global
      ;; buffer list in order to make sure that switching to the
      ;; previous/next buffer traverse it in opposite directions.  Skip
      ;; this step for side windows.
      (unless window-side
        (dolist (buffer (if bury-or-kill
                            (buffer-list frame)
                          (nreverse (buffer-list frame))))
          (when (and (buffer-live-p buffer)
                     (not (eq buffer old-buffer))
                     (or (null pred) (funcall pred buffer))
                     ;; Skip buffers whose names start with a space.
                     (not (eq (aref (buffer-name buffer) 0) ?\s))
                     ;; Skip buffers shown in a side window before.
                     (not (buffer-local-value 'window--sides-shown buffer))
                     (or bury-or-kill (not (memq buffer next-buffers))))
            (if (switch-to-prev-buffer-skip-p skip window buffer bury-or-kill)
	        (setq skipped (or skipped buffer))
              (setq new-buffer buffer)
              (set-window-buffer-start-and-point window new-buffer)
              (throw 'found t)))))

      (unless bury-or-kill
	;; Scan reverted next buffers last (must not use nreverse
	;; here!).
	(dolist (buffer (reverse next-buffers))
	  ;; Actually, buffer _must_ be live here since otherwise it
	  ;; would have been caught in the scan of previous buffers.
	  (when (and (or (buffer-live-p buffer)
			 (not (setq killed-buffers
				    (cons buffer killed-buffers))))
		     (not (eq buffer old-buffer))
                     (or (null pred) (funcall pred buffer))
		     (setq entry (assq buffer (window-prev-buffers window))))
            (if (switch-to-prev-buffer-skip-p skip window buffer bury-or-kill)
	        (setq skipped (or skipped buffer))
	      (setq new-buffer buffer)
	      (set-window-buffer-start-and-point
	       window new-buffer (nth 1 entry) (nth 2 entry))
	      (throw 'found t)))))

      (when skipped
        ;; Show first skipped buffer.
	(setq new-buffer skipped)
	(set-window-buffer-start-and-point window new-buffer)))

    (if bury-or-kill
	(let ((entry (and (eq bury-or-kill 'append)
			  (assq old-buffer (window-prev-buffers window)))))
	  ;; Remove `old-buffer' from WINDOW's previous and (restored list
	  ;; of) next buffers.
	  (set-window-prev-buffers
	   window (assq-delete-all old-buffer (window-prev-buffers window)))
	  (set-window-next-buffers window (delq old-buffer next-buffers))
	  (when entry
	    ;; Append old-buffer's entry to list of WINDOW's previous
	    ;; buffers so it's less likely to get switched to soon but
	    ;; `display-buffer-in-previous-window' can nevertheless find
	    ;; it.
	    (set-window-prev-buffers
	     window (append (window-prev-buffers window) (list entry)))))
      ;; Move `old-buffer' to head of WINDOW's restored list of next
      ;; buffers.
      (set-window-next-buffers
       window (cons old-buffer (delq old-buffer next-buffers))))

    ;; Remove killed buffers from WINDOW's previous and next buffers.
    (when killed-buffers
      (dolist (buffer killed-buffers)
	(set-window-prev-buffers
	 window (assq-delete-all buffer (window-prev-buffers window)))
	(set-window-next-buffers
	 window (delq buffer (window-next-buffers window)))))

    ;; Return new-buffer.
    new-buffer))

(defun switch-to-next-buffer (&optional window)
  "In WINDOW switch to next buffer.
WINDOW must be a live window and defaults to the selected one.
Return the buffer switched to, nil if no suitable buffer could be
found.

The option `switch-to-prev-buffer-skip' can be used to not switch
to certain buffers, for example, to those already shown in
another window.  Also, if WINDOW's frame has a `buffer-predicate'
parameter, that predicate may inhibit switching to certain
buffers.

This function is called by `next-buffer'."
  (interactive)
  (let* ((window (window-normalize-window window t))
	 (frame (window-frame window))
         (window-side (window-parameter window 'window-side))
	 (old-buffer (window-buffer window))
	 (next-buffers (window-next-buffers window))
         (pred (frame-parameter frame 'buffer-predicate))
         (skip
          (cond
           ((or (functionp switch-to-prev-buffer-skip)
                (memq switch-to-prev-buffer-skip '(t visible 0)))
            switch-to-prev-buffer-skip)
           ((or switch-to-prev-buffer-skip
                (not switch-to-visible-buffer))
            frame)))
	 new-buffer entry killed-buffers skipped)
    (when (window-minibuffer-p window)
      ;; Don't switch in minibuffer window.
      (unless (setq window (minibuffer-selected-window))
	(error "Window %s is a minibuffer window" window)))

    (unless (memq (window-dedicated-p window) '(nil side))
      ;; Don't switch in dedicated window.
      (error "Window %s is dedicated to buffer %s" window old-buffer))

    (catch 'found
      ;; Scan WINDOW's next buffers first.
      (dolist (buffer next-buffers)
	(when (and (or (buffer-live-p buffer)
		       (not (setq killed-buffers
				  (cons buffer killed-buffers))))
		   (not (eq buffer old-buffer))
                   (or (null pred) (funcall pred buffer))
		   (setq entry (assq buffer (window-prev-buffers window))))
          (if (switch-to-prev-buffer-skip-p skip window buffer)
	      (setq skipped buffer)
	    (setq new-buffer buffer)
	    (set-window-buffer-start-and-point
	     window new-buffer (nth 1 entry) (nth 2 entry))
	    (throw 'found t))))
      ;; Scan the buffer list of WINDOW's frame next, skipping previous
      ;; buffers entries.  Skip this step for side windows.
      (unless window-side
        (dolist (buffer (buffer-list frame))
          (when (and (buffer-live-p buffer)
                     (not (eq buffer old-buffer))
                     (or (null pred) (funcall pred buffer))
                     ;; Skip buffers whose names start with a space.
                     (not (eq (aref (buffer-name buffer) 0) ?\s))
                     ;; Skip buffers shown in a side window before.
                     (not (buffer-local-value 'window--sides-shown buffer))
                     (not (assq buffer (window-prev-buffers window))))
            (if (switch-to-prev-buffer-skip-p skip window buffer)
	        (setq skipped (or skipped buffer))
              (setq new-buffer buffer)
              (set-window-buffer-start-and-point window new-buffer)
              (throw 'found t)))))
      ;; Scan WINDOW's reverted previous buffers last (must not use
      ;; nreverse here!)
      (dolist (entry (reverse (window-prev-buffers window)))
	(when (and (not (eq (car entry) old-buffer))
                   (setq new-buffer (car entry))
		   (or (buffer-live-p new-buffer)
		       (not (setq killed-buffers
				  (cons new-buffer killed-buffers))))
                   (or (null pred) (funcall pred new-buffer)))
          (if (switch-to-prev-buffer-skip-p skip window new-buffer)
	      (setq skipped (or skipped new-buffer))
	    (set-window-buffer-start-and-point
	     window new-buffer (nth 1 entry) (nth 2 entry))
	    (throw 'found t))))

      (when skipped
        ;; Show first skipped buffer.
	(setq new-buffer skipped)
	(set-window-buffer-start-and-point window new-buffer)))

    ;; Remove `new-buffer' from and restore WINDOW's next buffers.
    (set-window-next-buffers window (delq new-buffer next-buffers))

    ;; Remove killed buffers from WINDOW's previous and next buffers.
    (when killed-buffers
      (dolist (buffer killed-buffers)
	(set-window-prev-buffers
	 window (assq-delete-all buffer (window-prev-buffers window)))
	(set-window-next-buffers
	 window (delq buffer (window-next-buffers window)))))

    ;; Return new-buffer.
    new-buffer))

(defun get-next-valid-buffer (list &optional buffer visible-ok frame)
  "Search LIST for a valid buffer to display in FRAME.
Return nil when all buffers in LIST are undesirable for display,
otherwise return the first suitable buffer in LIST.

Buffers not visible in windows are preferred to visible buffers,
unless VISIBLE-OK is non-nil.
If the optional argument FRAME is nil, it defaults to the selected frame.
If BUFFER is non-nil, ignore occurrences of that buffer in LIST."
  ;; This logic is more or less copied from other-buffer.
  (setq frame (or frame (selected-frame)))
  (let ((pred (frame-parameter frame 'buffer-predicate))
	found buf)
    (while (and (not found) list)
      (setq buf (car list))
      (if (and (not (eq buffer buf))
	       (buffer-live-p buf)
	       (or (null pred) (funcall pred buf))
	       (not (eq (aref (buffer-name buf) 0) ?\s))
	       (or visible-ok (null (get-buffer-window buf 'visible))))
	  (setq found buf)
	(setq list (cdr list))))
    (car list)))

(defun last-buffer (&optional buffer visible-ok frame)
  "Return the last buffer in FRAME's buffer list.
If BUFFER is the last buffer, return the preceding buffer
instead.  Buffers not visible in windows are preferred to visible
buffers, unless optional argument VISIBLE-OK is non-nil.
Optional third argument FRAME nil or omitted means use the
selected frame's buffer list.  If no such buffer exists, return
the buffer `*scratch*', creating it if necessary."
  (setq frame (or frame (selected-frame)))
  (or (get-next-valid-buffer (nreverse (buffer-list frame))
 			     buffer visible-ok frame)
      (get-buffer "*scratch*")
      (let ((scratch (get-buffer-create "*scratch*")))
	(set-buffer-major-mode scratch)
	scratch)))

(defcustom frame-auto-hide-function #'iconify-frame
  "Function called to automatically hide frames.
The function is called with one argument - a frame.

Functions affected by this option are those that bury a buffer
shown in a separate frame like `quit-window' and `bury-buffer'."
  :type '(choice (const :tag "Iconify" iconify-frame)
                 (const :tag "Make invisible" make-frame-invisible)
                 (const :tag "Delete" delete-frame)
                 (const :tag "Do nothing" ignore)
                 function)
  :group 'windows
  :group 'frames
  :version "26.1")

(defun window--delete (&optional window dedicated-only kill)
  "Delete WINDOW if possible.
WINDOW must be a live window and defaults to the selected one.
Optional argument DEDICATED-ONLY non-nil means to delete WINDOW
only if it's dedicated to its buffer.  Optional argument KILL
means the buffer shown in window will be killed.  Return non-nil
if WINDOW gets deleted or its frame is auto-hidden."
  (setq window (window-normalize-window window t))
  (unless (and dedicated-only (not (window-dedicated-p window)))
    (let ((deletable (window-deletable-p window)))
      (cond
       ((eq deletable 'frame)
	(let ((frame (window-frame window)))
	  (cond
	   (kill
	    (delete-frame frame))
           ((functionp (frame-parameter frame 'auto-hide-function))
            (funcall (frame-parameter frame 'auto-hide-function)))
           ((functionp frame-auto-hide-function)
	    (funcall frame-auto-hide-function frame))))
	'frame)
       (deletable
	(delete-window window)
	t)))))

(defun bury-buffer (&optional buffer-or-name)
  "Put BUFFER-OR-NAME at the end of the list of all buffers.
There it is the least likely candidate for `other-buffer' to
return; thus, the least likely buffer for \\[switch-to-buffer] to
select by default.

You can specify a buffer name as BUFFER-OR-NAME, or an actual
buffer object.  If BUFFER-OR-NAME is nil or omitted, bury the
current buffer.  Also, if BUFFER-OR-NAME is nil or omitted,
remove the current buffer from the selected window if it is
displayed there."
  (interactive)
  (let* ((buffer (window-normalize-buffer buffer-or-name)))
    ;; If `buffer-or-name' is not on the selected frame we unrecord it
    ;; although it's not "here" (call it a feature).
    (bury-buffer-internal buffer)
    ;; Handle case where `buffer-or-name' is nil and the current buffer
    ;; is shown in the selected window.
    (cond
     ((or buffer-or-name
          (not (eq buffer (window-buffer)))
          ;; Don't try to delete the minibuffer window, undedicate it
          ;; or switch to a previous buffer in it.
          (window-minibuffer-p)))
     ((window--delete nil t))
     (t
      ;; Switch to another buffer in window.
      (set-window-dedicated-p nil nil)
      (switch-to-prev-buffer nil 'bury)))
    ;; Always return nil.
    nil))

(defun unbury-buffer ()
  "Switch to the last buffer in the buffer list."
  (interactive)
  (switch-to-buffer (last-buffer)))

(defun next-buffer (&optional arg interactive)
  "In selected window switch to ARGth next buffer.
Call `switch-to-next-buffer' unless the selected window is the
minibuffer window or is dedicated to its buffer."
  (interactive "p\np")
  (cond
   ((window-minibuffer-p)
    (user-error "Cannot switch buffers in minibuffer window"))
   ((eq (window-dedicated-p) t)
    (user-error "Window is strongly dedicated to its buffer"))
   (t
    (dotimes (_ (or arg 1))
      (when (and (not (switch-to-next-buffer))
                 interactive
                 (not (or executing-kbd-macro noninteractive)))
        (user-error "No next buffer"))))))

(defun previous-buffer (&optional arg interactive)
  "In selected window switch to ARGth previous buffer.
Call `switch-to-prev-buffer' unless the selected window is the
minibuffer window or is dedicated to its buffer."
  (interactive "p\np")
  (cond
   ((window-minibuffer-p)
    (user-error "Cannot switch buffers in minibuffer window"))
   ((eq (window-dedicated-p) t)
    (user-error "Window is strongly dedicated to its buffer"))
   (t
    (dotimes (_ (or arg 1))
      (when (and (not (switch-to-prev-buffer))
                 interactive
                 (not (or executing-kbd-macro noninteractive)))
        (user-error "No previous buffer"))))))

(defun delete-windows-on (&optional buffer-or-name frame)
  "Delete all windows showing BUFFER-OR-NAME.
BUFFER-OR-NAME may be a buffer or the name of an existing buffer
and defaults to the current buffer.

Interactively, prompt for the buffer.

The following non-nil values of the optional argument FRAME
have special meanings:

- t means consider all windows on the selected frame only.

- `visible' means consider all windows on all visible frames on
  the current terminal.

- 0 (the number zero) means consider all windows on all visible
  and iconified frames on the current terminal.

- A frame means consider all windows on that frame only.

Any other value of FRAME means consider all windows on all
frames.

Interactively, FRAME is the prefix argument, so you can
use \\[universal-argument] 0 to specify all windows only on
the current terminal's frames.

If a frame's root window shows the buffer specified by
BUFFER-OR-NAME and is dedicated to that buffer and that frame
does not host the active minibuffer window and there is at least
one other frame on that frame's terminal, delete that frame.
Otherwise, do not delete a frame's root window if it shows the
buffer specified by BUFFER-OR-NAME and do not delete any frame's
main window showing that buffer either.  Rather, in any such
case, call `switch-to-prev-buffer' to show another buffer in that
window and make sure the window is no more dedicated to its
buffer.

If the buffer specified by BUFFER-OR-NAME is shown in a
minibuffer window, do nothing for that window.  For any window
that does not show that buffer, remove the buffer from that
window's lists of previous and next buffers."
  (interactive "bDelete windows on (buffer):\nP")
  (let ((buffer (window-normalize-buffer buffer-or-name))
	;; Handle the "inverted" meaning of the FRAME argument wrt other
	;; `window-list-1' based function.
	(all-frames (cond ((not frame) t) ((eq frame t) nil) (t frame))))
    (dolist (window (window-list-1 nil nil all-frames))
      (if (eq (window-buffer window) buffer)
	  (let ((deletable (window-deletable-p window)))
	    (cond
	     ((and (eq deletable 'frame) (window-dedicated-p window))
	      ;; Delete frame if and only if window is dedicated.
	      (delete-frame (window-frame window)))
	     ((eq deletable t)
	      ;; Delete window.
	      (delete-window window))
	     (t
	      ;; In window switch to previous buffer.
	      (set-window-dedicated-p window nil)
	      (switch-to-prev-buffer window 'bury))))
	;; If a window doesn't show BUFFER, unrecord BUFFER in it.
	(unrecord-window-buffer window buffer)))))

(defun replace-buffer-in-windows (&optional buffer-or-name)
  "Replace BUFFER-OR-NAME with some other buffer in all windows showing it.
BUFFER-OR-NAME may be a buffer or the name of an existing buffer
and defaults to the current buffer.

When a window showing BUFFER-OR-NAME is dedicated, that window is
deleted.  If that window is the only window on its frame, the
frame is deleted too when there are other frames left.  If there
are no other frames left, some other buffer is displayed in that
window.

This function removes the buffer denoted by BUFFER-OR-NAME from
all window-local buffer lists."
  (interactive "bBuffer to replace: ")
  (let ((buffer (window-normalize-buffer buffer-or-name)))
    (dolist (window (window-list-1 nil nil t))
      (if (eq (window-buffer window) buffer)
	  (let ((dedicated-side (eq (window-dedicated-p window) 'side)))
            ;; Try to delete the window, with the exception of side-windows
            (when (or dedicated-side (not (window--delete window t t)))
              ;; Switch to another buffer in window.
              (set-window-dedicated-p window nil)
              (if (switch-to-prev-buffer window 'kill)
                  (and dedicated-side (set-window-dedicated-p window 'side))
                (window--delete window nil 'kill))))
	;; Unrecord BUFFER in WINDOW.
	(unrecord-window-buffer window buffer)))))

(defcustom quit-window-hook nil
  "Hook run before performing any other actions in the `quit-window' command."
  :type 'hook
  :version "27.1"
  :group 'windows)

(defun quit-restore-window (&optional window bury-or-kill)
  "Quit WINDOW and deal with its buffer.
WINDOW must be a live window and defaults to the selected one.

According to information stored in WINDOW's `quit-restore' window
parameter either (1) delete WINDOW and its frame, (2) delete
WINDOW but leave its frame alone, (3) restore the buffer
previously shown in WINDOW, or (4) make WINDOW display some other
buffer.  If WINDOW is not deleted, reset its `quit-restore'
parameter to nil.  See Info node `(elisp) Quitting Windows' for
more details.

Optional second argument BURY-OR-KILL tells how to proceed with
the buffer of WINDOW.  The following values are handled:

nil means to not handle the buffer in a particular way.  This
  means that if WINDOW is not deleted by this function, invoking
  `switch-to-prev-buffer' will usually show the buffer again.

`append' means that if WINDOW is not deleted, move its buffer to
  the end of WINDOW's previous buffers so it's less likely that a
  future invocation of `switch-to-prev-buffer' will switch to it.
  Also, move the buffer to the end of the frame's buffer list.

`bury' means that if WINDOW is not deleted, remove its buffer
  from WINDOW'S list of previous buffers.  Also, move the buffer
  to the end of the frame's buffer list.  This value provides the
  most reliable remedy to not have `switch-to-prev-buffer' switch
  to this buffer again without killing the buffer.

`kill' means to kill WINDOW's buffer."
  (setq window (window-normalize-window window t))
  (let* ((buffer (window-buffer window))
	 (quit-restore (window-parameter window 'quit-restore))
         (prev-buffer (catch 'prev-buffer
                        (dolist (buf (window-prev-buffers window))
                          (unless (eq (car buf) buffer)
                            (throw 'prev-buffer (car buf))))))
         (dedicated (window-dedicated-p window))
	 quad entry)
    (cond
     ((and (not prev-buffer)
	   (eq (nth 1 quit-restore) 'tab)
	   (eq (nth 3 quit-restore) buffer))
      (tab-bar-close-tab)
      ;; If the previously selected window is still alive, select it.
      (when (window-live-p (nth 2 quit-restore))
	(select-window (nth 2 quit-restore))))
     ((and (not prev-buffer)
	   (or (eq (nth 1 quit-restore) 'frame)
	       (and (eq (nth 1 quit-restore) 'window)
		    ;; If the window has been created on an existing
		    ;; frame and ended up as the sole window on that
		    ;; frame, do not delete it (Bug#12764).
		    (not (eq window (frame-root-window window)))))
	   (eq (nth 3 quit-restore) buffer)
	   ;; Delete WINDOW if possible.
	   (window--delete window nil (eq bury-or-kill 'kill)))
      ;; If the previously selected window is still alive, select it.
      (when (window-live-p (nth 2 quit-restore))
	(select-window (nth 2 quit-restore))))
     ((and (listp (setq quad (nth 1 quit-restore)))
	   (buffer-live-p (car quad))
	   (eq (nth 3 quit-restore) buffer))
      ;; Show another buffer stored in quit-restore parameter.
      (when (and (integerp (nth 3 quad))
		 (if (window-combined-p window)
                     (/= (nth 3 quad) (window-total-height window))
                   (/= (nth 3 quad) (window-total-width window))))
	;; Try to resize WINDOW to its old height but don't signal an
	;; error.
	(condition-case nil
	    (window-resize
             window
             (- (nth 3 quad) (if (window-combined-p window)
                                 (window-total-height window)
                               (window-total-width window)))
             (window-combined-p window t))
	  (error nil)))
      (set-window-dedicated-p window nil)
      ;; Restore WINDOW's previous buffer, start and point position.
      (set-window-buffer-start-and-point
       window (nth 0 quad) (nth 1 quad) (nth 2 quad))
      ;; Preserve the side-window dedication
      (when (eq dedicated 'side) (set-window-dedicated-p window 'side))
      ;; Deal with the buffer we just removed from WINDOW.
      (setq entry (and (eq bury-or-kill 'append)
		       (assq buffer (window-prev-buffers window))))
      (when bury-or-kill
	;; Remove buffer from WINDOW's previous and next buffers.
	(set-window-prev-buffers
	 window (assq-delete-all buffer (window-prev-buffers window)))
	(set-window-next-buffers
	 window (delq buffer (window-next-buffers window))))
      (when entry
	;; Append old buffer's entry to list of WINDOW's previous
	;; buffers so it's less likely to get switched to soon but
	;; `display-buffer-in-previous-window' can nevertheless find it.
	(set-window-prev-buffers
	 window (append (window-prev-buffers window) (list entry))))
      ;; Reset the quit-restore parameter.
      (set-window-parameter window 'quit-restore nil)
      ;; Select old window.
      (when (window-live-p (nth 2 quit-restore))
	(select-window (nth 2 quit-restore))))
     (t
      ;; Show some other buffer in WINDOW and reset the quit-restore
      ;; parameter.
      (set-window-parameter window 'quit-restore nil)
      ;; Make sure that WINDOW is no more dedicated.
      (set-window-dedicated-p window nil)
      (if (and prev-buffer (eq dedicated 'side))
          ;; If a previous buffer exists, try to switch to it and
          ;; to preserve the side-window dedication. If that
          ;; fails for whatever reason, try to delete the window.
          (if (switch-to-prev-buffer window bury-or-kill)
              (set-dedicated-window-p window 'side)
            (window--delete window nil (eq bury-or-kill 'kill)))
          ;; If no previous buffer exists, try to delete the window.  If
          ;; that fails for whatever reason, try to switch to some other
          ;; buffer.
          (unless (window--delete window nil (eq bury-or-kill 'kill))
            (switch-to-prev-buffer window bury-or-kill)))))

    ;; Deal with the buffer.
    (cond
     ((not (buffer-live-p buffer)))
     ((eq bury-or-kill 'kill)
      (kill-buffer buffer))
     (bury-or-kill
      (bury-buffer-internal buffer)))))

(defun quit-window (&optional kill window)
  "Quit WINDOW and bury its buffer.
WINDOW must be a live window and defaults to the selected one.
With prefix argument KILL non-nil, kill the buffer instead of
burying it.

This calls the function `quit-restore-window' to delete WINDOW or
show some other buffer in it.  See Info node `(elisp) Quitting
Windows' for more details.

The functions in `quit-window-hook' will be run before doing
anything else."
  (interactive "P")
  ;; Run the hook from the buffer implied to get any buffer-local
  ;; values.
  (with-current-buffer (window-buffer (window-normalize-window window))
    (run-hooks 'quit-window-hook))
  (quit-restore-window window (if kill 'kill 'bury)))

(defun quit-windows-on (&optional buffer-or-name kill frame)
  "Quit all windows showing BUFFER-OR-NAME.
BUFFER-OR-NAME may be a buffer or the name of an existing buffer
and defaults to the current buffer.  Optional argument KILL
non-nil means to kill BUFFER-OR-NAME.  KILL nil means to bury
BUFFER-OR-NAME.  Optional argument FRAME is handled as by
`delete-windows-on'.

This function calls `quit-window' on all candidate windows
showing BUFFER-OR-NAME."
  (interactive "bQuit windows on (buffer):\nP")
  (let ((buffer (window-normalize-buffer buffer-or-name))
	;; Handle the "inverted" meaning of the FRAME argument wrt other
	;; `window-list-1' based function.
	(all-frames (cond ((not frame) t) ((eq frame t) nil) (t frame))))
    (dolist (window (window-list-1 nil nil all-frames))
      (if (eq (window-buffer window) buffer)
	  (quit-window kill window)
	;; If a window doesn't show BUFFER, unrecord BUFFER in it.
	(unrecord-window-buffer window buffer)))))
\f
(defun window--combination-resizable (parent &optional horizontal)
  "Return number of pixels recoverable from height of window PARENT.
PARENT must be a vertical (horizontal if HORIZONTAL is non-nil)
window combination.  The return value is the sum of the pixel
heights of all non-fixed height child windows of PARENT divided
by their number plus 1.  If HORIZONTAL is non-nil, return the sum
of the pixel widths of all non-fixed width child windows of
PARENT divided by their number plus 1."
  (let ((sibling (window-child parent))
	(number 0)
	(size 0))
    (while sibling
      (unless (window-size-fixed-p sibling horizontal)
	(setq number (1+ number))
	(setq size (+ (window-size sibling horizontal t) size)))
      (setq sibling (window-next-sibling sibling)))
    (/ size (1+ number))))

(defun split-window (&optional window size side pixelwise)
  "Make a new window adjacent to WINDOW.
WINDOW must be a valid window and defaults to the selected one.
Return the new window which is always a live window.

Optional argument SIZE a positive number means make WINDOW SIZE
lines or columns tall.  If SIZE is negative, make the new window
-SIZE lines or columns tall.  If and only if SIZE is non-nil, its
absolute value can be less than `window-min-height' or
`window-min-width'; so this command can make a new window as
small as one line or two columns.  SIZE defaults to half of
WINDOW's size.

Optional third argument SIDE nil (or `below') specifies that the
new window shall be located below WINDOW.  SIDE `above' means the
new window shall be located above WINDOW.  In both cases SIZE
specifies the new number of lines for WINDOW (or the new window
if SIZE is negative) including space reserved for the mode and/or
header line.

SIDE t (or `right') specifies that the new window shall be
located on the right side of WINDOW.  SIDE `left' means the new
window shall be located on the left of WINDOW.  In both cases
SIZE specifies the new number of columns for WINDOW (or the new
window provided SIZE is negative) including space reserved for
fringes and the scrollbar or a divider column.

For compatibility reasons, SIDE `up' and `down' are interpreted
as `above' and `below'.  Any other non-nil value for SIDE is
currently handled like t (or `right').

PIXELWISE, if non-nil, means to interpret SIZE pixelwise.

If the variable `ignore-window-parameters' is non-nil or the
`split-window' parameter of WINDOW equals t, do not process any
parameters of WINDOW.  Otherwise, if the `split-window' parameter
of WINDOW specifies a function, call that function with all three
arguments and return the value returned by that function.

Otherwise, if WINDOW is part of an atomic window, \"split\" the
root of that atomic window.  The new window does not become a
member of that atomic window.

If WINDOW is live, properties of the new window like margins and
scrollbars are inherited from WINDOW.  If WINDOW is an internal
window, these properties as well as the buffer displayed in the
new window are inherited from the window selected on WINDOW's
frame.  The selected window is not changed by this function."
  (setq window (window-normalize-window window))
  (let* ((side (cond
		((not side) 'below)
                ((eq side 'up) 'above)
                ((eq side 'down) 'below)
		((memq side '(below above right left)) side)
		(t 'right)))
	 (horizontal (not (memq side '(below above))))
	 (frame (window-frame window))
	 (parent (window-parent window))
	 (function (window-parameter window 'split-window))
	 (window-side (window-parameter window 'window-side))
	 ;; Rebind the following two variables since in some cases we
	 ;; have to override their value.
	 (window-combination-limit window-combination-limit)
	 (window-combination-resize window-combination-resize)
	 (char-size (frame-char-size window horizontal))
	 (pixel-size
	  (when (numberp size)
	    (window--size-to-pixel window size horizontal pixelwise t)))
	 (divider-width (if horizontal
			    (frame-right-divider-width frame)
			  (frame-bottom-divider-width frame)))
	 atom-root ignore)
    (window--check frame)
    (catch 'done
      (cond
       ;; Ignore window parameters if either `ignore-window-parameters'
       ;; is t or the 'split-window' parameter equals t.
       ((or ignore-window-parameters (eq function t)))
       ((functionp function)
	;; The 'split-window' parameter specifies the function to call.
	;; If that function is `ignore', do nothing.
	(throw 'done (funcall function window size side)))
       ;; If WINDOW is part of an atomic window, split the root window
       ;; of that atomic window instead.
       ((and (window-parameter window 'window-atom)
	     (setq atom-root (window-atom-root window))
	     (not (eq atom-root window)))
	(throw 'done (split-window atom-root size side pixelwise)))
       ;; If WINDOW is a side window or its first or last child is a
       ;; side window, throw an error unless `window-combination-resize'
       ;; equals 'side.
       ((and (not (eq window-combination-resize 'side))
	     (window-parameter window 'window-side))
	(error "Cannot split side window or parent of side window"))
       ;; If `window-combination-resize' is 'side and window has a side
       ;; window sibling, bind `window-combination-limit' to t.
       ((and (not (eq window-combination-resize 'side))
	     (or (and (window-prev-sibling window)
		      (window-parameter
		       (window-prev-sibling window) 'window-side))
		 (and (window-next-sibling window)
		      (window-parameter
		       (window-next-sibling window) 'window-side))))
	(setq window-combination-limit t)))

      ;; If `window-combination-resize' is t and SIZE is non-negative,
      ;; bind `window-combination-limit' to t.
      (when (and (eq window-combination-resize t)
		 pixel-size (> pixel-size 0))
	(setq window-combination-limit t))

      (let* ((parent-pixel-size
	      ;; 'parent-pixel-size' is the pixel size of WINDOW's
	      ;; parent, provided it has one.
	      (when parent (window-size parent horizontal t)))
	     ;; 'resize' non-nil means we are supposed to resize other
	     ;; windows in WINDOW's combination.
	     (resize
	      (and window-combination-resize
		   (or (window-parameter window 'window-side)
		       (not (eq window-combination-resize 'side)))
		   (not (eq window-combination-limit t))
		   ;; Resize makes sense in iso-combinations only.
		   (window-combined-p window horizontal)))
	     ;; 'old-pixel-size' is the current pixel size of WINDOW.
	     (old-pixel-size (window-size window horizontal t))
	     ;; 'new-size' is the specified or calculated size of the
	     ;; new window.
	     new-pixel-size new-parent new-normal)
	(cond
	 ((not pixel-size)
	  (setq new-pixel-size
		(if resize
		    ;; When resizing try to give the new window the
		    ;; average size of a window in its combination.
		    (max (min (- parent-pixel-size
				 (window-min-size parent horizontal nil t))
			      (window--combination-resizable parent horizontal))
			 (window-min-pixel-size))
		  ;; Else try to give the new window half the size
		  ;; of WINDOW (plus an eventual odd pixel).
		  (/ old-pixel-size 2)))
	  (unless window-resize-pixelwise
	    ;; Round to nearest char-size multiple.
	    (setq new-pixel-size
		  (* char-size (round new-pixel-size char-size)))))
	 ((>= pixel-size 0)
	  ;; SIZE non-negative specifies the new size of WINDOW.

	  ;; Note: Specifying a non-negative SIZE is practically
	  ;; always done as workaround for making the new window
	  ;; appear above or on the left of the new window (the
	  ;; ispell window is a typical example of that).  In all
	  ;; these cases the SIDE argument should be set to 'above
	  ;; or 'left in order to support the 'resize option.
	  ;; Here we have to nest the windows instead, see above.
	  (setq new-pixel-size (- old-pixel-size pixel-size)))
	 (t
	  ;; SIZE negative specifies the size of the new window.
	  (setq new-pixel-size (- pixel-size))))

	;; Check SIZE.
	(cond
	 ((not pixel-size)
	  (cond
	   (resize
	    ;; SIZE unspecified, resizing.
	    (unless (or (window-sizable-p
			 parent (- (+ new-pixel-size divider-width)) horizontal
			 nil t)
			(window-sizable-p
			 parent (- (+ new-pixel-size divider-width)) horizontal
			 (setq ignore 'preserved) t))
	      (error "Window %s too small for splitting" parent)))
	   ((and (> (+ new-pixel-size divider-width
		       (window-min-size window horizontal nil t))
		    old-pixel-size)
		 (> (+ new-pixel-size divider-width
		       (window-min-size
			window horizontal (setq ignore 'preserved) t))
		    old-pixel-size))
	    ;; SIZE unspecified, no resizing.
	    (error "Window %s too small for splitting" window))))
	 ((and (>= pixel-size 0)
	       (or (>= pixel-size old-pixel-size)
		   (< new-pixel-size
		      (window-safe-min-pixel-size window horizontal))))
	  ;; SIZE specified as new size of old window.  If the new size
	  ;; is larger than the old size or the size of the new window
	  ;; would be less than the safe minimum, signal an error.
	  (error "Window %s too small for splitting" window))
	 (resize
	  ;; SIZE specified, resizing.
	  (unless (or (window-sizable-p
		       parent (- (+ new-pixel-size divider-width)) horizontal
		       nil t)
		      (window-sizable-p
		       parent (- (+ new-pixel-size divider-width)) horizontal
		       (setq ignore 'preserved) t))
	    ;; If we cannot resize the parent give up.
	    (error "Window %s too small for splitting" parent)))
	 ((or (< new-pixel-size
		 (window-safe-min-pixel-size window horizontal))
	      (< (- old-pixel-size new-pixel-size)
		 (window-safe-min-pixel-size window horizontal)))
	  ;; SIZE specification violates minimum size restrictions.
	  (error "Window %s too small for splitting" window)))

	(window--resize-reset frame horizontal)

	(setq new-parent
	      ;; Make new-parent non-nil if we need a new parent window;
	      ;; either because we want to nest or because WINDOW is not
	      ;; iso-combined.
	      (or (eq window-combination-limit t)
		  (not (window-combined-p window horizontal))))
	(setq new-normal
	      ;; Make new-normal the normal size of the new window.
	      (cond
	       (pixel-size (/ (float new-pixel-size)
			      (if new-parent old-pixel-size parent-pixel-size)))
	       (new-parent 0.5)
	       (resize (/ 1.0 (1+ (window-combinations parent horizontal t))))
	       (t (/ (window-normal-size window horizontal) 2.0))))

	(if resize
	    ;; Try to get space from OLD's siblings.  We could go "up" and
	    ;; try getting additional space from surrounding windows but
	    ;; we won't be able to return space to those windows when we
	    ;; delete the one we create here.  Hence we do not go up.
	    (progn
	      (window--resize-child-windows
	       parent (- new-pixel-size) horizontal nil ignore)
	      (let* ((normal (- 1.0 new-normal))
		     (sub (window-child parent)))
		(while sub
		  (set-window-new-normal
		   sub (* (window-normal-size sub horizontal) normal))
		  (setq sub (window-right sub)))))
	  ;; Get entire space from WINDOW.
	  (set-window-new-pixel
	   window (- old-pixel-size new-pixel-size))
	  (window--resize-this-window
	   window (- new-pixel-size) horizontal ignore)
	  (set-window-new-normal
	   window (- (if new-parent 1.0 (window-normal-size window horizontal))
		     new-normal)))

	(let* ((new (split-window-internal window new-pixel-size side new-normal)))
	  (window--pixel-to-total frame horizontal)
	  ;; Assign window-side parameters, if any.
	  (cond
	   ((eq window-combination-resize 'side)
	    (let ((window-side
		   (cond
		    (window-side window-side)
		    ((eq side 'above) 'top)
		    ((eq side 'below) 'bottom)
		    (t side))))
	      ;; We made a new side window.
	      (set-window-parameter new 'window-side window-side)
	      (when (and new-parent (window-parameter window 'window-side))
		;; We've been splitting a side root window.  Give the
		;; new parent the same window-side parameter.
		(set-window-parameter
		 (window-parent new) 'window-side window-side))))
	   ((eq window-combination-resize 'atom)
            ;; Make sure `window--check' won't destroy an existing
	    ;; atomic window in case the new window gets nested inside.
	    (unless (window-parameter window 'window-atom)
	      (set-window-parameter window 'window-atom t))
	    (when new-parent
	      (set-window-parameter (window-parent new) 'window-atom t))
	    (set-window-parameter new 'window-atom t)))

          ;; Make the new window inherit the `min-margins' parameter of
          ;; WINDOW (Bug#44483).
          (let ((min-margins (window-parameter window 'min-margins)))
            (when min-margins
              (set-window-parameter new 'min-margins min-margins)))

          ;; Sanitize sizes unless SIZE was specified.
	  (unless size
            (window--sanitize-window-sizes horizontal))

	  (run-window-scroll-functions new)
	  (window--check frame)
	  ;; Always return the new window.
	  new)))))

(defun split-window-no-error (&optional window size side pixelwise)
  "Make a new window adjacent to WINDOW.
This function is like `split-window' but does not signal an error
when WINDOW cannot be split.

For the meaning of all arguments see the documentation of
`split-window'."
  (condition-case nil
      (split-window window size side pixelwise)
    (error nil)))

;; I think this should be the default; I think people will prefer it--rms.
(defcustom split-window-keep-point t
  "If non-nil, \\[split-window-below] preserves point in the new window.
If nil, adjust point in the two windows to minimize redisplay.
This option applies only to `split-window-below' and functions
that call it.  The low-level `split-window' function always keeps
the original point in both windows."
  :type 'boolean
  :group 'windows)

(defun split-window-below (&optional size)
  "Split the selected window into two windows, one above the other.
The selected window is above.  The newly split-off window is
below and displays the same buffer.  Return the new window.

If optional argument SIZE is omitted or nil, both windows get the
same height, or close to it.  If SIZE is positive, the upper
\(selected) window gets SIZE lines.  If SIZE is negative, the
lower (new) window gets -SIZE lines.

If the variable `split-window-keep-point' is non-nil, both
windows get the same value of point as the selected window.
Otherwise, the window starts are chosen so as to minimize the
amount of redisplay; this is convenient on slow terminals."
  (interactive "P")
  (let ((old-window (selected-window))
	(old-point (window-point))
	(size (and size (prefix-numeric-value size)))
        moved-by-window-height moved new-window bottom)
    (when (and size (< size 0) (< (- size) window-min-height))
      ;; `split-window' would not signal an error here.
      (error "Size of new window too small"))
    (setq new-window (split-window nil size))
    (unless split-window-keep-point
      (with-current-buffer (window-buffer)
	;; Use `save-excursion' around vertical movements below
	;; (Bug#10971).  Note: When the selected window's buffer has a
	;; header line, up to two lines of the buffer may not show up
	;; in the resulting configuration.
	(save-excursion
	  (goto-char (window-start))
	  (setq moved (vertical-motion (window-height)))
	  (set-window-start new-window (point))
	  (when (> (point) (window-point new-window))
	    (set-window-point new-window (point)))
	  (when (= moved (window-height))
	    (setq moved-by-window-height t)
	    (vertical-motion -1))
	  (setq bottom (point)))
	(and moved-by-window-height
	     (<= bottom (point))
	     (set-window-point old-window (1- bottom)))
	(and moved-by-window-height
	     (<= (window-start new-window) old-point)
	     (set-window-point new-window old-point)
	     (select-window new-window))))
    ;; Always copy quit-restore parameter in interactive use.
    (let ((quit-restore (window-parameter old-window 'quit-restore)))
      (when quit-restore
	(set-window-parameter new-window 'quit-restore quit-restore)))
    new-window))

(defalias 'split-window-vertically 'split-window-below)

(defun split-window-right (&optional size)
  "Split the selected window into two side-by-side windows.
The selected window is on the left.  The newly split-off window
is on the right and displays the same buffer.  Return the new
window.

If optional argument SIZE is omitted or nil, both windows get the
same width, or close to it.  If SIZE is positive, the left-hand
\(selected) window gets SIZE columns.  If SIZE is negative, the
right-hand (new) window gets -SIZE columns.  Here, SIZE includes
the width of the window's scroll bar; if there are no scroll
bars, it includes the width of the divider column to the window's
right, if any."
  (interactive "P")
  (let ((old-window (selected-window))
	(size (and size (prefix-numeric-value size)))
	new-window)
    (when (and size (< size 0) (< (- size) window-min-width))
      ;; `split-window' would not signal an error here.
      (error "Size of new window too small"))
    (setq new-window (split-window nil size t))
    ;; Always copy quit-restore parameter in interactive use.
    (let ((quit-restore (window-parameter old-window 'quit-restore)))
      (when quit-restore
	(set-window-parameter new-window 'quit-restore quit-restore)))
    new-window))

(defalias 'split-window-horizontally 'split-window-right)
\f
;;; Balancing windows.

;; The following routine uses the recycled code from an old version of
;; `window--resize-child-windows'.  It's not very pretty, but coding it the way the
;; new `window--resize-child-windows' code does would hardly make it any shorter or
;; more readable (FWIW we'd need three loops - one to calculate the
;; minimum sizes per window, one to enlarge or shrink windows until the
;; new parent-size matches, and one where we shrink the largest/enlarge
;; the smallest window).
(defun balance-windows-2 (window horizontal)
  "Subroutine of `balance-windows-1'.
WINDOW must be a vertical combination (horizontal if HORIZONTAL
is non-nil)."
  (let* ((char-size (if window-resize-pixelwise
			1
		      (frame-char-size window horizontal)))
	 (first (window-child window))
	 (sub first)
	 (number-of-children 0)
	 (parent-size (window-new-pixel window))
	 (total-sum parent-size)
	 failed size sub-total sub-delta sub-amount rest)
    (while sub
      (if (window-size-fixed-p sub horizontal)
          (progn
            (setq total-sum
	          (- total-sum (window-size sub horizontal t)))
	    (set-window-new-normal sub 'ignore))
        (setq number-of-children (1+ number-of-children)))
      (setq sub (window-right sub)))

    (setq failed t)
    (while (and failed (> number-of-children 0))
      (setq size (/ total-sum number-of-children))
      (setq failed nil)
      (setq sub first)
      (while (and sub (not failed))
	;; Ignore child windows that should be ignored or are stuck.
	(unless (window--resize-child-windows-skip-p sub)
	  (setq sub-total (window-size sub horizontal t))
	  (setq sub-delta (- size sub-total))
	  (setq sub-amount
		(window-sizable sub sub-delta horizontal nil t))
	  ;; Register the new total size for this child window.
	  (set-window-new-pixel sub (+ sub-total sub-amount))
	  (unless (= sub-amount sub-delta)
	    (setq total-sum (- total-sum sub-total sub-amount))
	    (setq number-of-children (1- number-of-children))
	    ;; We failed and need a new round.
	    (setq failed t)
	    (set-window-new-normal sub 'skip)))
	(setq sub (window-right sub))))

    (when (> number-of-children 0)
      (setq rest (% total-sum number-of-children))
      ;; Fix rounding by trying to enlarge non-stuck windows by one line
      ;; (column) until `rest' is zero.
      (setq sub first)
      (while (and sub (> rest 0))
        (unless (window--resize-child-windows-skip-p window)
	  (set-window-new-pixel sub (min rest char-size) t)
	  (setq rest (- rest char-size)))
        (setq sub (window-right sub))))

    ;; Fix rounding by trying to enlarge stuck windows by one line
    ;; (column) until `rest' equals zero.
    (setq sub first)
    (while (and sub (> rest 0))
      (unless (eq (window-new-normal sub) 'ignore)
	(set-window-new-pixel sub (min rest char-size) t)
	(setq rest (- rest char-size)))
      (setq sub (window-right sub)))

    (setq sub first)
    (while sub
      ;; Record new normal sizes.
      (set-window-new-normal
       sub (/ (if (eq (window-new-normal sub) 'ignore)
		  (window-size sub horizontal t)
		(window-new-pixel sub))
	      (float parent-size)))
      ;; Recursively balance each window's child windows.
      (balance-windows-1 sub horizontal)
      (setq sub (window-right sub)))))

(defun balance-windows-1 (window &optional horizontal)
  "Subroutine of `balance-windows'."
  (if (window-child window)
      (let ((sub (window-child window)))
	(if (window-combined-p sub horizontal)
	    (balance-windows-2 window horizontal)
	  (let ((size (window-new-pixel window)))
	    (while sub
	      (set-window-new-pixel sub size)
	      (balance-windows-1 sub horizontal)
	      (setq sub (window-right sub))))))))

(defun balance-windows (&optional window-or-frame)
  "Balance the sizes of windows of WINDOW-OR-FRAME.
WINDOW-OR-FRAME is optional and defaults to the selected frame.
If WINDOW-OR-FRAME denotes a frame, balance the sizes of all
windows of that frame.  If WINDOW-OR-FRAME denotes a window,
recursively balance the sizes of all child windows of that
window."
  (interactive)
  (let* ((window
	  (cond
	   ((or (not window-or-frame)
		(frame-live-p window-or-frame))
	    (frame-root-window window-or-frame))
	   ((or (window-live-p window-or-frame)
		(window-child window-or-frame))
	    window-or-frame)
	   (t
	    (error "Not a window or frame %s" window-or-frame))))
	 (frame (window-frame window)))
    ;; Balance vertically.
    (window--resize-reset (window-frame window))
    (balance-windows-1 window)
    (when (window--resize-apply-p frame)
      (window-resize-apply frame)
      (window--pixel-to-total frame))
    ;; Balance horizontally.
    (window--resize-reset (window-frame window) t)
    (balance-windows-1 window t)
    (when (window--resize-apply-p frame t)
      (window-resize-apply frame t)
      (window--pixel-to-total frame t))))

(defun window-fixed-size-p (&optional window direction)
  "Return t if WINDOW cannot be resized in DIRECTION.
WINDOW defaults to the selected window.  DIRECTION can be
nil (i.e. any), `height' or `width'."
  (with-current-buffer (window-buffer window)
    (and window-size-fixed
         (not (and direction
		   (member (cons direction window-size-fixed)
			   '((height . width) (width . height))))))))

;;; A different solution to balance-windows.
(defvar-local window-area-factor 1
  "Factor by which the window area should be over-estimated.
This is used by `balance-windows-area'.
Changing this globally has no effect.")

(defun balance-windows-area-adjust (window delta horizontal pixelwise)
  "Wrapper around `window-resize' with error checking.
Arguments WINDOW, DELTA and HORIZONTAL are passed on to that function."
  ;; `window-resize' may fail if delta is too large.
  (while (>= (abs delta) 1)
    (condition-case nil
        (progn
	  ;; It was wrong to use `window-resize' here.  Somehow
	  ;; `balance-windows-area' depends on resizing windows
	  ;; asymmetrically.
	  (adjust-window-trailing-edge window delta horizontal pixelwise)
          (setq delta 0))
      (error
       ;;(message "adjust: %s" (error-message-string err))
       (setq delta (/ delta 2))))))

(defun balance-windows-area ()
  "Make all visible windows the same area (approximately).
See also `window-area-factor' to change the relative size of
specific buffers."
  (interactive)
  (let* ((unchanged 0) (carry 0) (round 0)
         ;; Remove fixed-size windows.
         (wins (delq nil (mapcar (lambda (win)
                                   (if (not (window-fixed-size-p win)) win))
                                 (window-list nil 'nomini))))
         (changelog nil)
	 (pixelwise window-resize-pixelwise)
	 next)
    ;; Resizing a window changes the size of surrounding windows in complex
    ;; ways, so it's difficult to balance them all.  The introduction of
    ;; `adjust-window-trailing-edge' made it a bit easier, but it is still
    ;; very difficult to do.  `balance-window' above takes an off-line
    ;; approach: get the whole window tree, then balance it, then try to
    ;; adjust the windows so they fit the result.
    ;; Here, instead, we take a "local optimization" approach, where we just
    ;; go through all the windows several times until nothing needs to be
    ;; changed.  The main problem with this approach is that it's difficult
    ;; to make sure it terminates, so we use some heuristic to try and break
    ;; off infinite loops.
    ;; After a round without any change, we allow a second, to give a chance
    ;; to the carry to propagate a minor imbalance from the end back to
    ;; the beginning.
    (while (< unchanged 2)
      ;; (message "New round")
      (setq unchanged (1+ unchanged) round (1+ round))
      (dolist (win wins)
        (setq next win)
        (while (progn (setq next (next-window next))
                      (window-fixed-size-p next)))
        ;; (assert (eq next (or (cadr (member win wins)) (car wins))))
        (let* ((horiz
                (< (car (window-pixel-edges win)) (car (window-pixel-edges next))))
               (areadiff (/ (- (* (window-size next nil pixelwise)
				  (window-size next t pixelwise)
                                  (buffer-local-value 'window-area-factor
                                                      (window-buffer next)))
                               (* (window-size win nil pixelwise)
				  (window-size win t pixelwise)
                                  (buffer-local-value 'window-area-factor
                                                      (window-buffer win))))
                            (max (buffer-local-value 'window-area-factor
                                                     (window-buffer win))
                                 (buffer-local-value 'window-area-factor
                                                     (window-buffer next)))))
               (edgesize (if horiz
                             (+ (window-size win nil pixelwise)
				(window-size next nil pixelwise))
                           (+ (window-size win t pixelwise)
			      (window-size next t pixelwise))))
               (diff (/ areadiff edgesize)))
          (when (zerop diff)
            ;; Maybe diff is actually closer to 1 than to 0.
            (setq diff (/ (* 3 areadiff) (* 2 edgesize))))
          (when (and (zerop diff) (not (zerop areadiff)))
            (setq diff (/ (+ areadiff carry) edgesize))
            ;; Change things smoothly.
            (if (or (> diff 1) (< diff -1)) (setq diff (/ diff 2))))
          (if (zerop diff)
              ;; Make sure negligible differences don't accumulate to
              ;; become significant.
              (setq carry (+ carry areadiff))
	    ;; This used `adjust-window-trailing-edge' before and uses
	    ;; `window-resize' now.  Error wrapping is still needed.
	    (balance-windows-area-adjust win diff horiz pixelwise)
            ;; (sit-for 0.5)
            (let ((change (cons win (window-pixel-edges win))))
              ;; If the same change has been seen already for this window,
              ;; we're most likely in an endless loop, so don't count it as
              ;; a change.
              (unless (member change changelog)
                (push change changelog)
                (setq unchanged 0 carry 0)))))))
    ;; We've now basically balanced all the windows.
    ;; But there may be some minor off-by-one imbalance left over,
    ;; so let's do some fine tuning.
    ;; (bw-finetune wins)
    ;; (message "Done in %d rounds" round)
    ))

;;; Window states, how to get them and how to put them in a window.
(defun window--state-get-1 (window &optional writable)
  "Helper function for `window-state-get'."
  (let* ((type
	  (cond
	   ((window-top-child window) 'vc)
	   ((window-left-child window) 'hc)
	   (t 'leaf)))
	 (buffer (window-buffer window))
	 (selected (eq window (selected-window)))
	 (next-buffers (when (window-live-p window)
	                 (delq nil (mapcar (lambda (buffer)
                                             (and (buffer-live-p buffer) buffer))
                                           (window-next-buffers window)))))
	 (prev-buffers (when (window-live-p window)
	                 (delq nil (mapcar (lambda (entry)
                                             (and (buffer-live-p (nth 0 entry))
                                                  entry))
                                           (window-prev-buffers window)))))
	 (head
	  `(,type
            ,@(unless (window-next-sibling window) '((last . t)))
            (pixel-width . ,(window-pixel-width window))
            (pixel-height . ,(window-pixel-height window))
            (total-width . ,(window-total-width window))
            (total-height . ,(window-total-height window))
            (normal-height . ,(window-normal-size window))
            (normal-width . ,(window-normal-size window t))
            ,@(unless (window-live-p window)
                `((combination-limit . ,(window-combination-limit window))))
            ,@(let ((parameters (window-parameters window))
		    list)
		;; Make copies of those window parameters whose
		;; persistence property is `writable' if WRITABLE is
		;; non-nil and non-nil if WRITABLE is nil.
                (dolist (par parameters)
		  (let ((pers (cdr (assq (car par)
					 window-persistent-parameters))))
		    (when (and pers (or (not writable) (eq pers 'writable)))
		      (setq list (cons (cons (car par) (cdr par)) list)))))
		;; Add `clone-of' parameter if necessary.
		(let ((pers (cdr (assq 'clone-of
				       window-persistent-parameters))))
		  (when (and pers (or (not writable) (eq pers 'writable))
			     (not (assq 'clone-of list)))
		    (setq list (cons (cons 'clone-of window) list))))
                (when list
                  `((parameters . ,list))))
            ,@(when buffer
                ;; All buffer related things go in here.
		(let ((point (window-point window))
		      (start (window-start window)))
		  `((buffer
		     ,(if writable (buffer-name buffer) buffer)
		     (selected . ,selected)
		     (hscroll . ,(window-hscroll window))
		     (fringes . ,(window-fringes window))
		     (margins . ,(window-margins window))
		     (scroll-bars . ,(window-scroll-bars window))
		     (vscroll . ,(window-vscroll window))
		     (dedicated . ,(window-dedicated-p window))
		     (point . ,(if writable
                                   point
                                 (with-current-buffer buffer
                                   (copy-marker point
                                                (buffer-local-value
                                                 'window-point-insertion-type
                                                 buffer)))))
		     (start . ,(if writable
                                   start
                                 (with-current-buffer buffer
                                   (copy-marker start))))))))
            ,@(when next-buffers
                `((next-buffers
                   . ,(if writable
                          (mapcar (lambda (buffer) (buffer-name buffer))
                                  next-buffers)
                        next-buffers))))
            ,@(when prev-buffers
                `((prev-buffers
                   . ,(if writable
                          (mapcar (lambda (entry)
                                    (list (buffer-name (nth 0 entry))
                                          (marker-position (nth 1 entry))
                                          (marker-position (nth 2 entry))))
                                  prev-buffers)
                        prev-buffers))))))
	 (tail
	  (when (memq type '(vc hc))
	    (let (list)
	      (setq window (window-child window))
	      (while window
		(setq list (cons (window--state-get-1 window writable) list))
		(setq window (window-right window)))
	      (nreverse list)))))
    (append head tail)))

(defun window-state-get (&optional window writable)
  "Return state of WINDOW as a Lisp object.
WINDOW can be any window and defaults to the root window of the
selected frame.

Optional argument WRITABLE non-nil means do not use markers for
sampling `window-point' and `window-start'.  Together, WRITABLE
and the variable `window-persistent-parameters' specify which
window parameters are saved by this function.  WRITABLE should be
non-nil when the return value shall be written to a file and read
back in another session.  Otherwise, an application may run into
an `invalid-read-syntax' error while attempting to read back the
value from file.

The return value can be used as argument for `window-state-put'
to put the state recorded here into an arbitrary window.  The
value can be also stored on disk and read back in a new session."
  (setq window
	(if window
	    (if (window-valid-p window)
		window
	      (error "%s is not a live or internal window" window))
	  (frame-root-window)))
  ;; The return value is a cons whose car specifies some constraints on
  ;; the size of WINDOW.  The cdr lists the states of the child windows
  ;; of WINDOW.
  (cons
   ;; Frame related things would go into a function, say `frame-state',
   ;; calling `window-state-get' to insert the frame's root window.
   `((min-height        . ,(window-min-size window))
     (min-width         . ,(window-min-size window t))
     (min-height-ignore . ,(window-min-size window nil t))
     (min-width-ignore  . ,(window-min-size window t t))
     (min-height-safe   . ,(window-min-size window nil 'safe))
     (min-width-safe    . ,(window-min-size window t 'safe))
     (min-pixel-height  . ,(window-min-size window nil nil t))
     (min-pixel-width   . ,(window-min-size window t nil t))
     (min-pixel-height-ignore . ,(window-min-size window nil t t))
     (min-pixel-width-ignore  . ,(window-min-size window t t t))
     (min-pixel-height-safe   . ,(window-min-size window nil 'safe t))
     (min-pixel-width-safe    . ,(window-min-size window t 'safe t)))
   (window--state-get-1 window writable)))

(defvar window-state-put-list nil
  "Helper variable for `window-state-put'.")

(defvar window-state-put-stale-windows nil
  "Helper variable for `window-state-put'.")

(defun window--state-put-1 (state &optional window ignore totals pixelwise)
  "Helper function for `window-state-put'."
  (let ((type (car state)))
    (setq state (cdr state))
    (cond
     ((eq type 'leaf)
      ;; For a leaf window just add unprocessed entries to
      ;; `window-state-put-list'.
      (push (cons window state) window-state-put-list))
     ((memq type '(vc hc))
      (let* ((horizontal (eq type 'hc))
	     (total (window-size window horizontal pixelwise))
             (first t)
             (window-combination-limit (cdr (assq 'combination-limit state)))
	     size new)
	(dolist (item state)
	  ;; Find the next child window.  WINDOW always points to the
	  ;; real window that we want to fill with what we find here.
	  (when (memq (car item) '(leaf vc hc))
	    (if (assq 'last item)
		;; The last child window.  Below `window--state-put-1'
		;; will put into it whatever ITEM has in store.
		(setq new nil)
	      ;; Not the last child window, prepare for splitting
	      ;; WINDOW.  SIZE is the new (and final) size of the old
	      ;; window.
	      (setq size
		    (if totals
			;; Use total size.
			(if pixelwise
			    (cdr (assq (if horizontal
					   'pixel-width
					 'pixel-height)
				       item))
			  (cdr (assq (if horizontal
					 'total-width
				       'total-height)
				     item)))
		      ;; Use normalized size and round.
		      (round
		       (* total
			  (cdr (assq (if horizontal 'normal-width 'normal-height)
				     item))))))

	      ;; Use safe sizes, we try to resize later.
	      (setq size (max size
			      (if horizontal
				  (* window-safe-min-width
				     (if pixelwise
					 (frame-char-width (window-frame window))
				       1))
				(* window-safe-min-height
				   (if pixelwise
				       (frame-char-height (window-frame window))
				     1)))))
	      (if (window-sizable-p window (- size) horizontal 'safe pixelwise)
                  (progn
                    (setq new (split-window-no-error
                               window size horizontal pixelwise))
                    (setq window-combination-limit nil))
		;; Give up if we can't resize window down to safe sizes.
		(error "Cannot resize window %s" window))

	      (when first
		(setq first nil)
		;; When creating the first child window add for parent
		;; unprocessed entries to `window-state-put-list'.
		(setq window-state-put-list
		      (cons (cons (window-parent window) state)
			    window-state-put-list))))

	    ;; Now process the current window (either the one we've just
	    ;; split or the last child of its parent).
	    (window--state-put-1 item window ignore totals)
	    ;; Continue with the last window split off.
	    (setq window new))))))))

(defun window--state-put-2 (ignore pixelwise)
  "Helper function for `window-state-put'."
  (dolist (item window-state-put-list)
    (let ((window (car item))
	  (combination-limit (cdr (assq 'combination-limit item)))
	  (parameters (cdr (assq 'parameters item)))
	  (state (cdr (assq 'buffer item)))
	  (next-buffers (cdr (assq 'next-buffers item)))
	  (prev-buffers (cdr (assq 'prev-buffers item))))
      (when combination-limit
	(set-window-combination-limit window combination-limit))
      ;; Reset window's parameters and assign saved ones (we might want
      ;; a `remove-window-parameters' function here).
      (dolist (parameter (window-parameters window))
	(set-window-parameter window (car parameter) nil))
      (when parameters
	(dolist (parameter parameters)
	  (set-window-parameter window (car parameter) (cdr parameter))))
      ;; Process buffer related state.
      (when state
	(let ((buffer (get-buffer (car state)))
	      (state (cdr state)))
	  (if buffer
	      (with-current-buffer buffer
		(set-window-buffer window buffer)
		(set-window-hscroll window (cdr (assq 'hscroll state)))
		(apply 'set-window-fringes
		       (cons window (cdr (assq 'fringes state))))
		(let ((margins (cdr (assq 'margins state))))
		  (set-window-margins window (car margins) (cdr margins)))
		(let ((scroll-bars (cdr (assq 'scroll-bars state))))
		  (set-window-scroll-bars
		   window (car scroll-bars) (nth 2 scroll-bars)
		   (nth 3 scroll-bars) (nth 5 scroll-bars) (nth 6 scroll-bars)))
		(set-window-vscroll window (cdr (assq 'vscroll state)))
		;; Adjust vertically.
		(if (or (memq window-size-fixed '(t height))
                        (window-preserved-size window))
		    ;; A fixed height window, try to restore the
		    ;; original size.
		    (let ((delta
			   (- (cdr (assq
				    (if pixelwise 'pixel-height 'total-height)
				    item))
			      (window-size window nil pixelwise)))
			  window-size-fixed)
		      (when (window--resizable-p
			     window delta nil nil nil nil nil pixelwise)
			(window-resize window delta nil nil pixelwise)))
		  ;; Else check whether the window is not high enough.
		  (let* ((min-size
			  (window-min-size window nil ignore pixelwise))
			 (delta
			  (- min-size (window-size window nil pixelwise))))
		    (when (and (> delta 0)
			       (window--resizable-p
				window delta nil ignore nil nil nil pixelwise))
		      (window-resize window delta nil ignore pixelwise))))
		;; Adjust horizontally.
		(if (or (memq window-size-fixed '(t width))
                        (window-preserved-size window t))
		    ;; A fixed width window, try to restore the original
		    ;; size.
		    (let ((delta
			   (- (cdr (assq
				    (if pixelwise 'pixel-width 'total-width)
				    item))
			      (window-size window t pixelwise)))
			  window-size-fixed)
		      (when (window--resizable-p
			     window delta t nil nil nil nil pixelwise)
			(window-resize window delta t nil pixelwise)))
		  ;; Else check whether the window is not wide enough.
		  (let* ((min-size (window-min-size window t ignore pixelwise))
			 (delta (- min-size (window-size window t pixelwise))))
		    (when (and (> delta 0)
			       (window--resizable-p
				window delta t ignore nil nil nil pixelwise))
		      (window-resize window delta t ignore pixelwise))))
		;; Set dedicated status.
		(set-window-dedicated-p window (cdr (assq 'dedicated state)))
		;; Install positions (maybe we should do this after all
		;; windows have been created and sized).
		(ignore-errors
                  ;; Set 'noforce argument to avoid that window start
                  ;; overrides window point set below (Bug#24240).
		  (set-window-start window (cdr (assq 'start state)) 'noforce)
		  (set-window-point window (cdr (assq 'point state))))
		;; Select window if it's the selected one.
		(when (cdr (assq 'selected state))
		  (select-window window))
                (set-window-next-buffers
                 window
                 (delq nil (mapcar (lambda (buffer)
                                     (setq buffer (get-buffer buffer))
                                     (when (buffer-live-p buffer) buffer))
                                   next-buffers)))
                (set-window-prev-buffers
                 window
                 (delq nil (mapcar (lambda (entry)
                                     (let ((buffer (get-buffer (nth 0 entry)))
                                           (m1 (nth 1 entry))
                                           (m2 (nth 2 entry)))
                                       (when (buffer-live-p buffer)
                                         (list buffer
                                               (if (markerp m1) m1
                                                 (set-marker (make-marker) m1
                                                             buffer))
                                               (if (markerp m2) m2
                                                 (set-marker (make-marker) m2
                                                             buffer))))))
                                   prev-buffers))))
	    ;; We don't want to raise an error in case the buffer does
	    ;; not exist anymore, so we switch to a previous one and
	    ;; save the window with the intention of deleting it later
	    ;; if possible.
	    (switch-to-prev-buffer window)
	    (push window window-state-put-stale-windows)))))))

(defun window-state-put (state &optional window ignore)
  "Put window state STATE into WINDOW.
STATE should be the state of a window returned by an earlier
invocation of `window-state-get'.  Optional argument WINDOW must
specify a valid window.  If WINDOW is not a live window,
replace WINDOW by a new live window created on the same frame.
If WINDOW is nil, create a new window before putting STATE into it.

Optional argument IGNORE non-nil means ignore minimum window
sizes and fixed size restrictions.  IGNORE equal `safe' means
windows can get as small as `window-safe-min-height' and
`window-safe-min-width'."
  (setq window-state-put-stale-windows nil)

  ;; When WINDOW is internal or nil, reduce it to a live one,
  ;; then create a new window on the same frame to put STATE into.
  (unless (window-live-p window)
    (let ((root window))
      (setq window (if root
                       (catch 'live
                         (walk-window-subtree
                          (lambda (window)
                            (when (and (window-live-p window)
                                       (not (window-parameter
                                             window 'window-side)))
                              (throw 'live window)))
                          root))
                     (selected-window)))
      (delete-other-windows-internal window root)
      ;; Create a new window to replace the existing one.
      (setq window (prog1 (split-window window)
                     (delete-window window)))))

  (set-window-dedicated-p window nil)

  (let* ((frame (window-frame window))
	 (head (car state))
	 ;; We check here (1) whether the total sizes of root window of
	 ;; STATE and that of WINDOW are equal so we can avoid
	 ;; calculating new sizes, and (2) if we do have to resize
	 ;; whether we can do so without violating size restrictions.
	 (pixelwise (and (cdr (assq 'pixel-width state))
			 (cdr (assq 'pixel-height state))))
	 (totals (or (and pixelwise
			  (= (window-pixel-width window)
			     (cdr (assq 'pixel-width state)))
			  (= (window-pixel-height window)
			     (cdr (assq 'pixel-height state))))
		     (and (= (window-total-width window)
			     (cdr (assq 'total-width state)))
			  (= (window-total-height window)
			     (cdr (assq 'total-height state))))))
	 (min-height (cdr (assq
			   (if pixelwise 'min-pixel-height 'min-height)
			   head)))
	 (min-width (cdr (assq
			  (if pixelwise 'min-pixel-width 'min-weight)
			  head))))
    (if (and (not totals)
	     (or (> min-height (window-size window nil pixelwise))
		 (> min-width (window-size window t pixelwise)))
	     (or (not ignore)
		 (and (setq min-height
			    (cdr (assq
				  (if pixelwise
				      'min-pixel-height-ignore
				    'min-height-ignore)
				  head)))
		      (setq min-width
			    (cdr (assq
				  (if pixelwise
				      'min-pixel-width-ignore
				    'min-width-ignore)
				  head)))
		      (or (> min-height
			     (window-size window nil pixelwise))
			  (> min-width
			     (window-size window t pixelwise)))
		      (or (not (eq ignore 'safe))
			  (and (setq min-height
				     (cdr (assq
					   (if pixelwise
					       'min-pixel-height-safe
					     'min-height-safe)
					   head)))
			       (setq min-width
				     (cdr (assq
					   (if pixelwise
					       'min-pixel-width-safe
					     'min-width-safe)
					   head)))
			       (or (> min-height
				      (window-size window nil pixelwise))
				   (> min-width
				      (window-size window t pixelwise))))))))
	;; The check above might not catch all errors due to rounding
	;; issues - so IGNORE equal 'safe might not always produce the
	;; minimum possible state.  But such configurations hardly make
	;; sense anyway.
	(error "Window %s too small to accommodate state" window)
      (setq state (cdr state))
      (setq window-state-put-list nil)
      ;; Work on the windows of a temporary buffer to make sure that
      ;; splitting proceeds regardless of any buffer local values of
      ;; `window-size-fixed'.  Release that buffer after the buffers of
      ;; all live windows have been set by `window--state-put-2'.
      (with-temp-buffer
	(set-window-buffer window (current-buffer))
	(window--state-put-1 state window nil totals pixelwise)
	(window--state-put-2 ignore pixelwise))
      (while window-state-put-stale-windows
	(let ((window (pop window-state-put-stale-windows)))
	  (when (eq (window-deletable-p window) t)
	    (delete-window window))))
      (window--check frame))))

(defun window-state-buffers (state)
  "Return all buffers saved to the given window state STATE."
  (let ((buffer (cadr (assq 'buffer state)))
        (buffers (mapcan (lambda (item)
                           (when (memq (car item) '(leaf vc hc))
                             (window-state-buffers item)))
                         (if (consp (car state)) (list (cdr state)) (cdr state)))))
    (if buffer (cons buffer buffers) buffers)))

(defun window-swap-states (&optional window-1 window-2 size)
  "Swap the states of live windows WINDOW-1 and WINDOW-2.
WINDOW-1 must specify a live window and defaults to the selected
one.  WINDOW-2 must specify a live window and defaults to the
window following WINDOW-1 in the cyclic ordering of windows,
excluding minibuffer windows and including live windows on all
visible frames.

Optional argument SIZE non-nil means to try swapping the sizes of
WINDOW-1 and WINDOW-2 as well.  A value of `height' means to swap
heights only, a value of `width' means to swap widths only, while
t means to swap both widths and heights, if possible.  Frames are
not resized by this function."
  (interactive)
  (setq window-1 (window-normalize-window window-1 t))
  (if window-2
      (unless (window-live-p window-2)
        (error "%s is not a live window" window-2))
    (setq window-2 (next-window window-1 'nomini 'visible)))
  (unless (eq window-1 window-2)
    (let* ((height (memq size '(t height)))
           (width (memq size '(t width)))
           (state-1 (window-state-get window-1))
           (width-1 (and width (window-text-width window-1 t)))
           (height-1 (and height (window-text-height window-1 t)))
           (state-2 (window-state-get window-2))
           (width-2 (and width (window-text-width window-2 t)))
           (height-2 (and height (window-text-height window-2 t)))
           old preserved)
      ;; Swap basic states.
      (window-state-put state-1 window-2 t)
      (window-state-put state-2 window-1 t)
      ;; Swap overlays with `window' property.
      (with-current-buffer (window-buffer window-1)
        (dolist (overlay (overlays-in (point-min) (point-max)))
          (let ((window (overlay-get overlay 'window)))
            (cond
             ((not window))
             ((eq window window-1)
              (overlay-put overlay 'window window-2))
             ((eq window window-2)
              (overlay-put overlay 'window window-1))))))
      (unless (eq (window-buffer window-1) (window-buffer window-2))
        (with-current-buffer (window-buffer window-2)
          (dolist (overlay (overlays-in (point-min) (point-max)))
            (let ((window (overlay-get overlay 'window)))
              (cond
               ((not window))
               ((eq window window-1)
                (overlay-put overlay 'window window-2))
               ((eq window window-2)
                (overlay-put overlay 'window window-1)))))))
      ;; Try to swap window sizes.
      (when size
        (unless (= (setq old (window-text-width window-1 t)) width-2)
          (window-resize-no-error window-1 (- width-2 old) t t t))
        (unless (= (setq old (window-text-width window-2 t)) width-1)
          (setq preserved (window-preserved-size window-1 t))
          (window-preserve-size window-1 t t)
          (window-resize-no-error window-2 (- width-1 old) t t t)
          (window-preserve-size window-1 t preserved))
        (unless (= (setq old (window-text-height window-1 t)) height-2)
          (window-resize-no-error window-1 (- height-2 old) nil t t))
        (unless (= (setq old (window-text-height window-2 t)) height-1)
          (setq preserved (window-preserved-size window-1))
          (window-preserve-size window-1 nil t)
          (window-resize-no-error window-2 (- height-1 old) nil t t)
          (window-preserve-size window-1 nil preserved))))))
\f
(defun display-buffer-record-window (type window buffer)
  "Record information for window used by `display-buffer'.
WINDOW is the window used for or created by a buffer display
action function.  BUFFER is the buffer to display.  Note that
this function must be called before BUFFER is explicitly made
WINDOW's buffer (although WINDOW may show BUFFER already).

TYPE specifies the type of the calling operation and must be one
of the symbols `reuse' (meaning that WINDOW exists already and
will be used for displaying BUFFER), `window' (WINDOW was created
on an already existing frame) or `frame' (WINDOW was created on a
new frame).

This function installs or updates the `quit-restore' parameter of
WINDOW.  The `quit-restore' parameter is a list of four elements:
The first element is one of the symbols `window', `frame', `same'
or `other'.  The second element is either one of the symbols
`window' or `frame' or a list whose elements are the buffer
previously shown in the window, that buffer's window start and
window point, and the window's height.  The third element is the
window selected at the time the parameter was created.  The
fourth element is BUFFER."
  (cond
   ((eq type 'reuse)
    (if (eq (window-buffer window) buffer)
	;; WINDOW shows BUFFER already.  Update WINDOW's quit-restore
	;; parameter, if any.
	(let ((quit-restore (window-parameter window 'quit-restore)))
	  (when (consp quit-restore)
	    (setcar quit-restore 'same)
	    ;; The selected-window might have changed in
	    ;; between (Bug#20353).
	    (unless (or (eq window (selected-window))
                        (eq window (nth 2 quit-restore)))
	      (setcar (cddr quit-restore) (selected-window)))))
      ;; WINDOW shows another buffer.
      (with-current-buffer (window-buffer window)
	(set-window-parameter
	 window 'quit-restore
	 (list 'other
	       ;; A quadruple of WINDOW's buffer, start, point and height.
	       (list (current-buffer) (window-start window)
		     ;; Preserve window-point-insertion-type (Bug#12855).
		     (copy-marker
		      (window-point window) window-point-insertion-type)
		     (if (window-combined-p window)
                         (window-total-height window)
                       (window-total-width window)))
	       (selected-window) buffer)))))
   ((eq type 'window)
    ;; WINDOW has been created on an existing frame.
    (set-window-parameter
     window 'quit-restore
     (list 'window 'window (selected-window) buffer)))
   ((eq type 'frame)
    ;; WINDOW has been created on a new frame.
    (set-window-parameter
     window 'quit-restore
     (list 'frame 'frame (selected-window) buffer)))
   ((eq type 'tab)
    ;; WINDOW has been created on a new tab.
    (set-window-parameter
     window 'quit-restore
     (list 'tab 'tab (selected-window) buffer)))))

(defcustom display-buffer-function nil
  "If non-nil, function to call to handle `display-buffer'.
It will receive two args, the buffer and a flag which if non-nil
means that the currently selected window is not acceptable.  It
should choose or create a window, display the specified buffer in
it, and return the window.

The specified function should call `display-buffer-record-window'
with corresponding arguments to set up the quit-restore parameter
of the window used."
  :type '(choice
	  (const nil)
	  (function :tag "function"))
  :group 'windows)

(make-obsolete-variable 'display-buffer-function
			'display-buffer-alist "24.3")

;; Eventually, we want to turn this into a defvar; instead of
;; customizing this, the user should use a `pop-up-frame-parameters'
;; alist entry in `display-buffer-base-action'.
(defcustom pop-up-frame-alist nil
  "Alist of parameters for automatically generated new frames.
If non-nil, the value you specify here is used by the default
`pop-up-frame-function' for the creation of new frames.

Since `pop-up-frame-function' is used by `display-buffer' for
making new frames, any value specified here by default affects
the automatic generation of new frames via `display-buffer' and
all functions based on it.  The behavior of `make-frame' is not
affected by this variable."
  :type '(repeat (cons :format "%v"
		       (symbol :tag "Parameter")
		       (sexp :tag "Value")))
  :group 'frames)

(defcustom pop-up-frame-function
  (lambda () (make-frame pop-up-frame-alist))
  "Function used by `display-buffer' for creating a new frame.
This function is called with no arguments and should return a new
frame.  The default value calls `make-frame' with the argument
`pop-up-frame-alist'."
  :type 'function
  :group 'frames)

(defcustom special-display-buffer-names nil
  "List of names of buffers that should be displayed specially.
Displaying a buffer with `display-buffer' or `pop-to-buffer', if
its name is in this list, displays the buffer in a way specified
by `special-display-function'.  `special-display-popup-frame'
\(the default for `special-display-function') usually displays
the buffer in a separate frame made with the parameters specified
by `special-display-frame-alist'.  If `special-display-function'
has been set to some other function, that function is called with
the buffer as first, and nil as second argument.

Alternatively, an element of this list can be specified as
\(BUFFER-NAME FRAME-PARAMETERS), where BUFFER-NAME is a buffer
name and FRAME-PARAMETERS an alist of (PARAMETER . VALUE) pairs.
`special-display-popup-frame' will interpret such pairs as frame
parameters when it creates a special frame, overriding the
corresponding values from `special-display-frame-alist'.

As a special case, if FRAME-PARAMETERS contains (same-window . t)
`special-display-popup-frame' displays that buffer in the
selected window.  If FRAME-PARAMETERS contains (same-frame . t),
it displays that buffer in a window on the selected frame.

If `special-display-function' specifies some other function than
`special-display-popup-frame', that function is called with the
buffer named BUFFER-NAME as first, and FRAME-PARAMETERS as second
argument.

Finally, an element of this list can be also specified as
\(BUFFER-NAME FUNCTION OTHER-ARGS).  In that case,
`special-display-popup-frame' will call FUNCTION with the buffer
named BUFFER-NAME as first argument, and OTHER-ARGS as the
second.

Any alternative function specified here is responsible for
setting up the quit-restore parameter of the window used.

If this variable appears \"not to work\", because you added a
name to it but the corresponding buffer is displayed in the
selected window, look at the values of `same-window-buffer-names'
and `same-window-regexps'.  Those variables take precedence over
this one.

See also `special-display-regexps'."
  :type '(repeat
	  (choice :tag "Buffer"
		  :value ""
		  (string :format "%v")
		  (cons :tag "With parameters"
			:format "%v"
			:value ("" . nil)
			(string :format "%v")
			(repeat :tag "Parameters"
				(cons :format "%v"
				      (symbol :tag "Parameter")
				      (sexp :tag "Value"))))
		  (list :tag "With function"
			:format "%v"
			:value ("" . nil)
			(string :format "%v")
			(function :tag "Function")
			(repeat :tag "Arguments" (sexp)))))
  :group 'windows
  :group 'frames)
(make-obsolete-variable 'special-display-buffer-names 'display-buffer-alist "24.3")
(put 'special-display-buffer-names 'risky-local-variable t)

(defcustom special-display-regexps nil
  "List of regexps saying which buffers should be displayed specially.
Displaying a buffer with `display-buffer' or `pop-to-buffer', if
any regexp in this list matches its name, displays it specially
using `special-display-function'.  `special-display-popup-frame'
\(the default for `special-display-function') usually displays
the buffer in a separate frame made with the parameters specified
by `special-display-frame-alist'.  If `special-display-function'
has been set to some other function, that function is called with
the buffer as first, and nil as second argument.

Alternatively, an element of this list can be specified as
\(REGEXP FRAME-PARAMETERS), where REGEXP is a regexp as above and
FRAME-PARAMETERS an alist of (PARAMETER . VALUE) pairs.
`special-display-popup-frame' will then interpret these pairs as
frame parameters when creating a special frame for a buffer whose
name matches REGEXP, overriding the corresponding values from
`special-display-frame-alist'.

As a special case, if FRAME-PARAMETERS contains (same-window . t)
`special-display-popup-frame' displays buffers matching REGEXP in
the selected window.  (same-frame . t) in FRAME-PARAMETERS means
to display such buffers in a window on the selected frame.

If `special-display-function' specifies some other function than
`special-display-popup-frame', that function is called with the
buffer whose name matched REGEXP as first, and FRAME-PARAMETERS
as second argument.

Finally, an element of this list can be also specified as
\(REGEXP FUNCTION OTHER-ARGS).  `special-display-popup-frame'
will then call FUNCTION with the buffer whose name matched
REGEXP as first, and OTHER-ARGS as second argument.

Any alternative function specified here is responsible for
setting up the quit-restore parameter of the window used.

If this variable appears \"not to work\", because you added a
name to it but the corresponding buffer is displayed in the
selected window, look at the values of `same-window-buffer-names'
and `same-window-regexps'.  Those variables take precedence over
this one.

See also `special-display-buffer-names'."
  :type '(repeat
	  (choice :tag "Buffer"
		  :value ""
		  (regexp :format "%v")
		  (cons :tag "With parameters"
			:format "%v"
			:value ("" . nil)
			(regexp :format "%v")
			(repeat :tag "Parameters"
				(cons :format "%v"
				      (symbol :tag "Parameter")
				      (sexp :tag "Value"))))
		  (list :tag "With function"
			:format "%v"
			:value ("" . nil)
			(regexp :format "%v")
			(function :tag "Function")
			(repeat :tag "Arguments" (sexp)))))
  :group 'windows
  :group 'frames)
(make-obsolete-variable 'special-display-regexps 'display-buffer-alist "24.3")
(put 'special-display-regexps 'risky-local-variable t)

(defun special-display-p (buffer-name)
  "Return non-nil if a buffer named BUFFER-NAME gets a special frame.
More precisely, return t if `special-display-buffer-names' or
`special-display-regexps' contain a string entry equaling or
matching BUFFER-NAME.  If `special-display-buffer-names' or
`special-display-regexps' contain a list entry whose car equals
or matches BUFFER-NAME, the return value is the cdr of that
entry."
  (let (tmp)
    (cond
     ((member buffer-name special-display-buffer-names)
      t)
     ((setq tmp (assoc buffer-name special-display-buffer-names))
      (cdr tmp))
     ((catch 'found
	(dolist (regexp special-display-regexps)
	  (cond
	   ((stringp regexp)
	    (when (string-match-p regexp buffer-name)
	      (throw 'found t)))
	   ((and (consp regexp) (stringp (car regexp))
		 (string-match-p (car regexp) buffer-name))
	    (throw 'found (cdr regexp))))))))))

(defcustom special-display-frame-alist
  '((height . 14) (width . 80) (unsplittable . t))
  "Alist of parameters for special frames.
Special frames are used for buffers whose names are listed in
`special-display-buffer-names' and for buffers whose names match
one of the regular expressions in `special-display-regexps'.

This variable can be set in your init file, like this:

  (setq special-display-frame-alist \\='((width . 80) (height . 20)))

These supersede the values given in `default-frame-alist'."
  :type '(repeat (cons :format "%v"
			 (symbol :tag "Parameter")
			 (sexp :tag "Value")))
  :group 'frames)
(make-obsolete-variable 'special-display-frame-alist 'display-buffer-alist "24.3")

(defun special-display-popup-frame (buffer &optional args)
  "Pop up a frame displaying BUFFER and return its window.
If BUFFER is already displayed in a visible or iconified frame,
raise that frame.  Otherwise, display BUFFER in a new frame.

Optional argument ARGS is a list specifying additional
information.

If ARGS is an alist, use it as a list of frame parameters.  If
these parameters contain (same-window . t), display BUFFER in
the selected window.  If they contain (same-frame . t), display
BUFFER in a window of the selected frame.

If ARGS is a list whose car is a symbol, use (car ARGS) as a
function to do the work.  Pass it BUFFER as first argument, and
pass the elements of (cdr ARGS) as the remaining arguments."
  (if (and args (symbolp (car args)))
      (apply (car args) buffer (cdr args))
    (let ((window (get-buffer-window buffer 0)))
      (or
       ;; If we have a window already, make it visible.
       (when window
	 (let ((frame (window-frame window)))
	   (make-frame-visible frame)
	   (raise-frame frame)
	   (display-buffer-record-window 'reuse window buffer)
	   window))
       ;; Reuse the current window if the user requested it.
       (when (cdr (assq 'same-window args))
	 (condition-case nil
	     (progn (switch-to-buffer buffer nil t) (selected-window))
	   (error nil)))
       ;; Stay on the same frame if requested.
       (when (or (cdr (assq 'same-frame args)) (cdr (assq 'same-window args)))
	 (let* ((pop-up-windows t)
		pop-up-frames
		special-display-buffer-names special-display-regexps)
	   (display-buffer buffer)))
       ;; If no window yet, make one in a new frame.
       (let* ((frame
	       (with-current-buffer buffer
		 (make-frame (append args special-display-frame-alist))))
	      (window (frame-selected-window frame)))
	 (display-buffer-record-window 'frame window buffer)
	 (unless (eq buffer (window-buffer window))
	   (set-window-buffer window buffer)
	   (set-window-prev-buffers window nil))
	 (set-window-dedicated-p window t)
	 window)))))

(defcustom special-display-function 'special-display-popup-frame
  "Function to call for displaying special buffers.
This function is called with two arguments - the buffer and,
optionally, a list - and should return a window displaying that
buffer.  The default value usually makes a separate frame for the
buffer using `special-display-frame-alist' to specify the frame
parameters.  See the definition of `special-display-popup-frame'
for how to specify such a function.

A buffer is special when its name is either listed in
`special-display-buffer-names' or matches a regexp in
`special-display-regexps'.

The specified function should call `display-buffer-record-window'
with corresponding arguments to set up the quit-restore parameter
of the window used."
  :type 'function
  :group 'frames)
(make-obsolete-variable 'special-display-function 'display-buffer-alist "24.3")

(defcustom same-window-buffer-names nil
  "List of names of buffers that should appear in the \"same\" window.
`display-buffer' and `pop-to-buffer' show a buffer whose name is
on this list in the selected rather than some other window.

An element of this list can be a cons cell instead of just a
string.  In that case, the cell's car must be a string specifying
the buffer name.  This is for compatibility with
`special-display-buffer-names'; the cdr of the cons cell is
ignored.

See also `same-window-regexps'."
 :type '(repeat (string :format "%v"))
 :group 'windows)

(defcustom same-window-regexps nil
  "List of regexps saying which buffers should appear in the \"same\" window.
`display-buffer' and `pop-to-buffer' show a buffer whose name
matches a regexp on this list in the selected rather than some
other window.

An element of this list can be a cons cell instead of just a
string.  In that case, the cell's car must be a regexp matching
the buffer name.  This is for compatibility with
`special-display-regexps'; the cdr of the cons cell is ignored.

See also `same-window-buffer-names'."
  :type '(repeat (regexp :format "%v"))
  :group 'windows)

(defun same-window-p (buffer-name)
  "Return non-nil if buffer BUFFER-NAME would be shown in the \"same\" window.
This function returns non-nil if `display-buffer' or
`pop-to-buffer' would show a buffer named BUFFER-NAME in the
selected rather than (as usual) some other window.  See
`same-window-buffer-names' and `same-window-regexps'."
  (cond
   ((not (stringp buffer-name)))
   ;; The elements of `same-window-buffer-names' can be buffer
   ;; names or cons cells whose cars are buffer names.
   ((member buffer-name same-window-buffer-names))
   ((assoc buffer-name same-window-buffer-names))
   ((catch 'found
      (dolist (regexp same-window-regexps)
	;; The elements of `same-window-regexps' can be regexps
	;; or cons cells whose cars are regexps.
	(when (or (and (stringp regexp)
		       (string-match-p regexp buffer-name))
		  (and (consp regexp) (stringp (car regexp))
		       (string-match-p (car regexp) buffer-name)))
	  (throw 'found t)))))))

(defcustom pop-up-frames nil
  "Whether `display-buffer' should make a separate frame.
If nil, never make a separate frame.
If the value is `graphic-only', make a separate frame
on graphic displays only.
Any other non-nil value means always make a separate frame."
  :type '(choice
	  (const :tag "Never" nil)
	  (const :tag "On graphic displays only" graphic-only)
	  (const :tag "Always" t))
  :group 'windows)

(defcustom display-buffer-reuse-frames nil
  "Non-nil means `display-buffer' should reuse frames.
If the buffer in question is already displayed in a frame, raise
that frame."
  :type 'boolean
  :version "21.1"
  :group 'windows)

(make-obsolete-variable
 'display-buffer-reuse-frames
 "use a `reusable-frames' alist entry in `display-buffer-alist'."
 "24.3")

(defcustom pop-up-windows t
  "Non-nil means `display-buffer' should make a new window."
  :type 'boolean
  :group 'windows)

(defcustom split-window-preferred-function 'split-window-sensibly
  "Function called by `display-buffer' routines to split a window.
This function is called with a window as single argument and is
supposed to split that window and return the new window.  If the
window can (or shall) not be split, it is supposed to return nil.
The default is to call the function `split-window-sensibly' which
tries to split the window in a way which seems most suitable.
You can customize the options `split-height-threshold' and/or
`split-width-threshold' in order to have `split-window-sensibly'
prefer either vertical or horizontal splitting.

If you set this to any other function, bear in mind that the
`display-buffer' routines may call this function two times.  The
argument of the first call is the largest window on its frame.
If that call fails to return a live window, the function is
called again with the least recently used window as argument.  If
that call fails too, `display-buffer' will use an existing window
to display its buffer.

The window selected at the time `display-buffer' was invoked is
still selected when this function is called.  Hence you can
compare the window argument with the value of `selected-window'
if you intend to split the selected window instead or if you do
not want to split the selected window."
  :type 'function
  :version "23.1"
  :group 'windows)

(defcustom split-height-threshold 80
  "Minimum height for splitting windows sensibly.
If this is an integer, `split-window-sensibly' may split a window
vertically only if it has at least this many lines.  If this is
nil, `split-window-sensibly' is not allowed to split a window
vertically.  If, however, a window is the only window on its
frame, or all the other ones are dedicated,
`split-window-sensibly' may split it vertically disregarding the
value of this variable."
  :type '(choice (const nil) (integer :tag "lines"))
  :version "23.1"
  :group 'windows)

(defcustom split-width-threshold 160
  "Minimum width for splitting windows sensibly.
If this is an integer, `split-window-sensibly' may split a window
horizontally only if it has at least this many columns.  If this
is nil, `split-window-sensibly' is not allowed to split a window
horizontally."
  :type '(choice (const nil) (integer :tag "columns"))
  :version "23.1"
  :group 'windows)

(defun window-splittable-p (window &optional horizontal)
  "Return non-nil if `split-window-sensibly' may split WINDOW.
Optional argument HORIZONTAL nil or omitted means check whether
`split-window-sensibly' may split WINDOW vertically.  HORIZONTAL
non-nil means check whether WINDOW may be split horizontally.

WINDOW may be split vertically when the following conditions
hold:
- `window-size-fixed' is either nil or equals `width' for the
  buffer of WINDOW.
- `split-height-threshold' is an integer and WINDOW is at least as
  high as `split-height-threshold'.
- When WINDOW is split evenly, the emanating windows are at least
  `window-min-height' lines tall and can accommodate at least one
  line plus - if WINDOW has one - a mode line.

WINDOW may be split horizontally when the following conditions
hold:
- `window-size-fixed' is either nil or equals `height' for the
  buffer of WINDOW.
- `split-width-threshold' is an integer and WINDOW is at least as
  wide as `split-width-threshold'.
- When WINDOW is split evenly, the emanating windows are at least
  `window-min-width' or two (whichever is larger) columns wide."
  (when (and (window-live-p window)
             (not (window-parameter window 'window-side)))
    (with-current-buffer (window-buffer window)
      (if horizontal
	  ;; A window can be split horizontally when its width is not
	  ;; fixed, it is at least `split-width-threshold' columns wide
	  ;; and at least twice as wide as `window-min-width' and 2 (the
	  ;; latter value is hardcoded).
	  (and (memq window-size-fixed '(nil height))
	       ;; Testing `window-full-width-p' here hardly makes any
	       ;; sense nowadays.  This can be done more intuitively by
	       ;; setting up `split-width-threshold' appropriately.
	       (numberp split-width-threshold)
	       (>= (window-width window)
		   (max split-width-threshold
			(* 2 (max window-min-width 2)))))
	;; A window can be split vertically when its height is not
	;; fixed, it is at least `split-height-threshold' lines high,
	;; and it is at least twice as high as `window-min-height' and 2
	;; if it has a mode line or 1.
	(and (memq window-size-fixed '(nil width))
	     (numberp split-height-threshold)
	     (>= (window-height window)
		 (max split-height-threshold
		      (* 2 (max window-min-height
				(if mode-line-format 2 1))))))))))

(defun split-window-sensibly (&optional window)
  "Split WINDOW in a way suitable for `display-buffer'.
WINDOW defaults to the currently selected window.
If `split-height-threshold' specifies an integer, WINDOW is at
least `split-height-threshold' lines tall and can be split
vertically, split WINDOW into two windows one above the other and
return the lower window.  Otherwise, if `split-width-threshold'
specifies an integer, WINDOW is at least `split-width-threshold'
columns wide and can be split horizontally, split WINDOW into two
windows side by side and return the window on the right.  If this
can't be done either and WINDOW is the only window on its frame,
try to split WINDOW vertically disregarding any value specified
by `split-height-threshold'.  If that succeeds, return the lower
window.  Return nil otherwise.

By default `display-buffer' routines call this function to split
the largest or least recently used window.  To change the default
customize the option `split-window-preferred-function'.

You can enforce this function to not split WINDOW horizontally,
by setting (or binding) the variable `split-width-threshold' to
nil.  If, in addition, you set `split-height-threshold' to zero,
chances increase that this function does split WINDOW vertically.

In order to not split WINDOW vertically, set (or bind) the
variable `split-height-threshold' to nil.  Additionally, you can
set `split-width-threshold' to zero to make a horizontal split
more likely to occur.

Have a look at the function `window-splittable-p' if you want to
know how `split-window-sensibly' determines whether WINDOW can be
split."
  (let ((window (or window (selected-window))))
    (or (and (window-splittable-p window)
	     ;; Split window vertically.
	     (with-selected-window window
	       (split-window-below)))
	(and (window-splittable-p window t)
	     ;; Split window horizontally.
	     (with-selected-window window
	       (split-window-right)))
	(and
         ;; If WINDOW is the only usable window on its frame (it is
         ;; the only one or, not being the only one, all the other
         ;; ones are dedicated) and is not the minibuffer window, try
         ;; to split it vertically disregarding the value of
         ;; `split-height-threshold'.
         (let ((frame (window-frame window)))
           (or
            (eq window (frame-root-window frame))
            (catch 'done
              (walk-window-tree (lambda (w)
                                  (unless (or (eq w window)
                                              (window-dedicated-p w))
                                    (throw 'done nil)))
                                frame nil 'nomini)
              t)))
	 (not (window-minibuffer-p window))
	 (let ((split-height-threshold 0))
	   (when (window-splittable-p window)
	     (with-selected-window window
	       (split-window-below))))))))

(defun window--try-to-split-window (window &optional alist)
  "Try to split WINDOW.
Return value returned by `split-window-preferred-function' if it
represents a live window, nil otherwise."
      (and (window-live-p window)
	   (not (frame-parameter (window-frame window) 'unsplittable))
	   (let* ((window-combination-limit
		   ;; When `window-combination-limit' equals
		   ;; `display-buffer' or equals `resize-window' and a
		   ;; `window-height' or `window-width' alist entry are
		   ;; present, bind it to t so resizing steals space
		   ;; preferably from the window that was split.
		   (if (or (eq window-combination-limit 'display-buffer)
			   (and (eq window-combination-limit 'window-size)
				(or (cdr (assq 'window-height alist))
				    (cdr (assq 'window-width alist)))))
		       t
		     window-combination-limit))
		  (new-window
		   ;; Since `split-window-preferred-function' might
		   ;; throw an error use `condition-case'.
		   (condition-case nil
		       (funcall split-window-preferred-function window)
		     (error nil))))
	     (and (window-live-p new-window) new-window))))

(defun window--frame-usable-p (frame)
  "Return FRAME if it can be used to display a buffer."
  (when (frame-live-p frame)
    (let ((window (frame-root-window frame)))
      ;; `frame-root-window' may be an internal window which is considered
      ;; "dead" by `window-live-p'.  Hence if `window' is not live we
      ;; implicitly know that `frame' has a visible window we can use.
      (unless (and (window-live-p window)
                   (or (window-minibuffer-p window)
                       ;; If the window is soft-dedicated, the frame is usable.
                       ;; Actually, even if the window is really dedicated,
                       ;; the frame is still usable by splitting it.
                       ;; At least Emacs-22 allowed it, and it is desirable
                       ;; when displaying same-frame windows.
                       nil ; (eq t (window-dedicated-p window))
                       ))
	frame))))

(defvaralias 'even-window-heights 'even-window-sizes)
(defcustom even-window-sizes t
  "If non-nil `display-buffer' will try to even window sizes.
Otherwise `display-buffer' will leave the window configuration
alone.  Special values are `height-only' to even heights only and
`width-only' to even widths only.  Any other value means to even
any of them."
  :type '(choice
	  (const :tag "Never" nil)
	  (const :tag "Side-by-side windows only" width-only)
	  (const :tag "Windows above or below only" height-only)
	  (const :tag "Always" t))
  :version "25.1"
  :group 'windows)

(defun window--even-window-sizes (window)
  "Even sizes of WINDOW and selected window.
Even only if these windows are the only children of their parent,
`even-window-sizes' has the appropriate value and the selected
window is larger than WINDOW."
  (when (and (= (window-child-count (window-parent window)) 2)
             (eq (window-parent) (window-parent window)))
    (cond
     ((and (not (memq even-window-sizes '(nil height-only)))
           (window-combined-p window t)
           (> (window-total-width) (window-total-width window)))
      (condition-case nil
          (enlarge-window
           (/ (- (window-total-width window) (window-total-width)) 2) t)
        (error nil)))
     ((and (not (memq even-window-sizes '(nil width-only)))
           (window-combined-p window)
           (> (window-total-height) (window-total-height window)))
      (condition-case nil
          (enlarge-window
           (/ (- (window-total-height window) (window-total-height)) 2))
        (error nil))))))

(defun window--display-buffer (buffer window type &optional alist)
  "Display BUFFER in WINDOW.
WINDOW must be a live window chosen by a buffer display action
function for showing BUFFER.  TYPE tells whether WINDOW existed
already before that action function was called or is a new window
created by that function.  ALIST is a buffer display action alist
as compiled by `display-buffer'.

TYPE must be one of the following symbols: `reuse' (which means
WINDOW existed before the call of `display-buffer' and may
already show BUFFER or not), `window' (WINDOW was created on an
existing frame) or `frame' (WINDOW was created on a new frame).
TYPE is passed unaltered to `display-buffer-record-window'.

Handle WINDOW's dedicated flag as follows: If WINDOW already
shows BUFFER, leave it alone.  Otherwise, if ALIST contains a
`dedicated' entry and WINDOW is either new or that entry's value
equals `side', set WINDOW's dedicated flag to the value of that
entry.  Otherwise, if WINDOW is new and the value of
`display-buffer-mark-dedicated' is non-nil, set WINDOW's
dedicated flag to that value.  In any other case, reset WINDOW's
dedicated flag to nil.

Return WINDOW if BUFFER and WINDOW are live."
  (when (and (buffer-live-p buffer) (window-live-p window))
    (display-buffer-record-window type window buffer)
    (unless (eq buffer (window-buffer window))
      ;; Unless WINDOW already shows BUFFER reset its dedicated flag.
      (set-window-dedicated-p window nil)
      (set-window-buffer window buffer))
    (let ((alist-dedicated (assq 'dedicated alist)))
      ;; Maybe dedicate WINDOW to BUFFER if asked for.
      (cond
       ;; Don't dedicate WINDOW if it is dedicated because it shows
       ;; BUFFER already or it is reused and is not a side window.
       ((or (window-dedicated-p window)
            (and (eq type 'reuse) (not (eq (cdr alist-dedicated) 'side)))))
       ;; Otherwise, if ALIST contains a 'dedicated' entry, use that
       ;; entry's value (which may be nil).
       (alist-dedicated
        (set-window-dedicated-p window (cdr alist-dedicated)))
       ;; Otherwise, if 'display-buffer-mark-dedicated' is non-nil,
       ;; use that.
       (display-buffer-mark-dedicated
        (set-window-dedicated-p window display-buffer-mark-dedicated))))
    (when (memq type '(window frame tab))
      (set-window-prev-buffers window nil))

    (when (functionp (cdr (assq 'body-function alist)))
      (let ((inhibit-read-only t)
            (inhibit-modification-hooks t))
        (funcall (cdr (assq 'body-function alist)) window)))

    (let ((quit-restore (window-parameter window 'quit-restore))
	  (height (cdr (assq 'window-height alist)))
	  (width (cdr (assq 'window-width alist)))
	  (size (cdr (assq 'window-size alist)))
	  (preserve-size (cdr (assq 'preserve-size alist))))
      (cond
       ((or (eq type 'frame)
	    (and (eq (car quit-restore) 'same)
		 (eq (nth 1 quit-restore) 'frame)))
	;; A window that never showed another buffer but BUFFER ever
        ;; since it was created on a new frame.
        ;;
        ;; Adjust size of frame if asked for.  We probably should do
        ;; that only for a single window frame.
	(cond
	 ((not size))
	 ((consp size)
	  (let ((width (car size))
		(height (cdr size))
		(frame (window-frame window)))
	    (when (and (numberp width) (numberp height))
	      (set-frame-height
	       frame (+ (frame-height frame)
			(- height (window-total-height window))))
	      (set-frame-width
	       frame (+ (frame-width frame)
			(- width (window-total-width window)))))))
	 ((functionp size)
	  (ignore-errors (funcall size window)))))
       ((or (eq type 'window)
	    (and (eq (car quit-restore) 'same)
		 (eq (nth 1 quit-restore) 'window)))
	;; A window that never showed another buffer but BUFFER ever
        ;; since it was created on an existing frame.
        ;;
        ;; Adjust width and/or height of window if asked for.
	(cond
	 ((not height))
	 ((numberp height)
	  (let* ((new-height
		  (if (integerp height)
		      height
		    (round
		     (* (window-total-height (frame-root-window window))
			height))))
		 (delta (- new-height (window-total-height window))))
	    (when (and (window--resizable-p window delta nil 'safe)
		       (window-combined-p window))
	      (window-resize window delta nil 'safe))))
	 ((functionp height)
	  (ignore-errors (funcall height window))))
	;; Adjust width of window if asked for.
	(cond
	 ((not width))
	 ((numberp width)
	  (let* ((new-width
		  (if (integerp width)
		      width
		    (round
		     (* (window-total-width (frame-root-window window))
			width))))
		 (delta (- new-width (window-total-width window))))
	    (when (and (window--resizable-p window delta t 'safe)
		       (window-combined-p window t))
	      (window-resize window delta t 'safe))))
	 ((functionp width)
	  (ignore-errors (funcall width window))))
	;; Preserve window size if asked for.
	(when (consp preserve-size)
	  (window-preserve-size window t (car preserve-size))
	  (window-preserve-size window nil (cdr preserve-size)))))
      ;; Assign any window parameters specified.
      (let ((parameters (cdr (assq 'window-parameters alist))))
        (dolist (parameter parameters)
          (set-window-parameter
           window (car parameter) (cdr parameter)))))
    window))

(defun window--maybe-raise-frame (frame)
  (make-frame-visible frame)
  (unless (or (frame-parameter frame 'no-focus-on-map)
              ;; Don't raise frames that should not get focus.
              (frame-parameter frame 'no-accept-focus)
              ;; Assume the selected frame is already visible enough.
	      (eq frame (selected-frame))
	      ;; Assume the frame from which we invoked the
	      ;; minibuffer is visible.
	      (and (minibuffer-window-active-p (selected-window))
		   (eq frame (window-frame (minibuffer-selected-window)))))
    (raise-frame frame)))

;; FIXME: Not implemented.
;; FIXME: By the way, there could be more levels of dedication:
;; - `barely' dedicated doesn't prevent reuse of the window, only records that
;;   the window hasn't been used for something else yet.
;; - `soft' (`softly') dedicated only allows reuse when asked explicitly.
;; - `strongly' never allows reuse.
(defvar display-buffer-mark-dedicated nil
  "If non-nil, `display-buffer' marks the windows it creates as dedicated.
The actual non-nil value of this variable will be copied to the
`window-dedicated-p' flag.")

(defconst display-buffer--action-function-custom-type
  '(choice :tag "Function"
	   (const :tag "--" ignore) ; default for insertion
	   (const display-buffer-reuse-window)
	   (const display-buffer-pop-up-window)
	   (const display-buffer-same-window)
	   (const display-buffer-pop-up-frame)
	   (const display-buffer-in-child-frame)
	   (const display-buffer-below-selected)
	   (const display-buffer-at-bottom)
	   (const display-buffer-in-previous-window)
	   (const display-buffer-use-least-recent-window)
	   (const display-buffer-use-some-window)
	   (const display-buffer-use-some-frame)
	   (function :tag "Other function"))
  "Custom type for `display-buffer' action functions.")

(defconst display-buffer--action-custom-type
  `(cons :tag "Action"
	 (choice :tag "Action functions"
		 ,display-buffer--action-function-custom-type
		 (repeat
		  :tag "List of functions"
		  ,display-buffer--action-function-custom-type))
	 (alist :tag "Action arguments"
		:key-type symbol
		:value-type (sexp :tag "Value")))
  "Custom type for `display-buffer' actions.")

(defvar display-buffer-overriding-action '(nil . nil)
  "Overriding action for buffer display.
This action overrides all the other actions in the action
variables and arguments passed to `display-buffer'.  The value
should be a cons cell (FUNCTIONS . ALIST), where FUNCTIONS is a
function or a list of functions.  Each function should accept two
arguments: a buffer to display and an alist similar to ALIST.
See `display-buffer' for details.

This variable is not intended for user customization.  Lisp
programs should never set this variable permanently but may bind
it around calls of buffer display functions like `display-buffer'
or `pop-to-buffer'.  Since such a binding will affect any nested
buffer display requests, this variable should be used with utmost
care.")
(put 'display-buffer-overriding-action 'risky-local-variable t)

(defcustom display-buffer-alist nil
  "Alist of user-defined conditional actions for `display-buffer'.
Its value takes effect before processing the ACTION argument of
`display-buffer' and before `display-buffer-base-action' and
`display-buffer-fallback-action', but after
`display-buffer-overriding-action', which see.

If non-nil, this is an alist of elements (CONDITION . ACTION),
where:

 CONDITION is either a regexp matching buffer names, or a
  function that takes two arguments - a buffer name and the
  ACTION argument of `display-buffer' - and returns a boolean.

 ACTION is a cons cell (FUNCTIONS . ALIST), where FUNCTIONS is an
  action function or a list of action functions and ALIST is an
  action alist.  Each such action function should accept two
  arguments: a buffer to display and an alist of the same form as
  ALIST.  See `display-buffer' for details.

`display-buffer' scans this alist until it either finds a
matching regular expression or the function specified by a
condition returns non-nil.  In any of these cases, it adds the
associated action to the list of actions it will try."
  :type `(alist :key-type
		(choice :tag "Condition"
			regexp
			(function :tag "Matcher function"))
		:value-type ,display-buffer--action-custom-type)
  :risky t
  :version "24.1"
  :group 'windows)

(defcustom display-buffer-base-action '(nil . nil)
  "User-specified default action for `display-buffer'.
This is the default action used by `display-buffer' if no other
actions are specified or all fail, before falling back on
`display-buffer-fallback-action'.

It should be a cons cell (FUNCTIONS . ALIST), where FUNCTIONS is
an action function or a list of action functions and ALIST is an
action alist.  Each such action function should accept two
arguments: a buffer to display and an alist of the same form as
ALIST.  See `display-buffer' for details."
  :type display-buffer--action-custom-type
  :risky t
  :version "24.1"
  :group 'windows)

(defconst display-buffer-fallback-action
  '((display-buffer--maybe-same-window  ;FIXME: why isn't this redundant?
     display-buffer-reuse-window
     display-buffer--maybe-pop-up-frame-or-window
     display-buffer-in-previous-window
     display-buffer-use-some-window
     ;; If all else fails, pop up a new frame.
     display-buffer-pop-up-frame))
  "Default fallback action for `display-buffer'.
This is the action used by `display-buffer' if no other actions
have been specified, for example, by the user options
`display-buffer-alist' or `display-buffer-base-action', or they
all fail.  It should never be set by programs or users.  See
`display-buffer'.")
(put 'display-buffer-fallback-action 'risky-local-variable t)

(defun display-buffer-assq-regexp (buffer-name alist action)
  "Retrieve ALIST entry corresponding to BUFFER-NAME.
This returns the cdr of the alist entry ALIST if either its key
is a string that matches BUFFER-NAME, as reported by
`string-match-p'; or if the key is a function that returns
non-nil when called with three arguments: the ALIST key,
BUFFER-NAME and ACTION.  ACTION should have the form of the
action argument passed to `display-buffer'."
  (catch 'match
    (dolist (entry alist)
      (let ((key (car entry)))
	(when (or (and (stringp key)
		       (string-match-p key buffer-name))
		  (and (functionp key)
		       (funcall key buffer-name action)))
	  (throw 'match (cdr entry)))))))

(defvar display-buffer--same-window-action
  '(display-buffer-same-window
    (inhibit-same-window . nil))
  "A `display-buffer' action for displaying in the same window.
Specifies to call `display-buffer-same-window'.")
(put 'display-buffer--same-window-action 'risky-local-variable t)

(defvar display-buffer--other-frame-action
  '((display-buffer-reuse-window
     display-buffer-pop-up-frame)
    (reusable-frames . 0)
    (inhibit-same-window . t))
  "A `display-buffer' action for displaying in another frame.
Specifies to call `display-buffer-reuse-window', and if that
fails, call `display-buffer-pop-up-frame'.")
(put 'display-buffer--other-frame-action 'risky-local-variable t)

(defun display-buffer (buffer-or-name &optional action frame)
  "Display BUFFER-OR-NAME in some window, without selecting it.
To change which window is used, set `display-buffer-alist'
to an expression containing one of these \"action\" functions:

 `display-buffer-same-window' -- Use the selected window.
 `display-buffer-reuse-window' -- Use a window already showing
    the buffer.
 `display-buffer-in-previous-window' -- Use a window that did
    show the buffer before.
 `display-buffer-use-some-window' -- Use some existing window.
 `display-buffer-use-least-recent-window' -- Try to avoid re-using
    windows that have recently been switched to.
 `display-buffer-pop-up-window' -- Pop up a new window.
 `display-buffer-below-selected' -- Use or pop up a window below
    the selected one.
 `display-buffer-at-bottom' -- Use or pop up a window at the
    bottom of the selected frame.
 `display-buffer-pop-up-frame' -- Show the buffer on a new frame.
 `display-buffer-in-child-frame' -- Show the buffer in a
    child frame.
 `display-buffer-no-window' -- Do not display the buffer and
    have `display-buffer' return nil immediately.

For instance:

   (setq display-buffer-alist '((\".*\" display-buffer-at-bottom)))

Buffer display can be further customized to a very high degree;
the rest of this docstring explains some of the many
possibilities, and also see Info node `(emacs)Window Choice' for
more information.

BUFFER-OR-NAME must be a buffer or a string naming a live buffer.
Return the window chosen for displaying that buffer, or nil if no
such window is found.

Optional argument ACTION, if non-nil, should specify a buffer
display action of the form (FUNCTIONS . ALIST).  FUNCTIONS is
either an \"action function\" or a possibly empty list of action
functions.  ALIST is a possibly empty \"action alist\".

An action function is a function that accepts two arguments: the
buffer to display and an action alist.  Based on those arguments,
it should try to display the buffer in a window and return that
window.  An action alist is an association list mapping symbols
to values.  Action functions use the action alist passed to them
to fine-tune their behaviors.

`display-buffer' builds a list of action functions and an action
alist by combining any action functions and alists specified by
`display-buffer-overriding-action', `display-buffer-alist', the
ACTION argument, `display-buffer-base-action', and
`display-buffer-fallback-action' (in order).  Then it calls each
function in the combined function list in turn, passing the
buffer as the first argument and the combined action alist as the
second argument, until one of the functions returns non-nil.

See above for the action functions and the action they try to
perform.

Action alist entries are:
 `inhibit-same-window' -- A non-nil value prevents the same
    window from being used for display.
 `inhibit-switch-frame' -- A non-nil value prevents any frame
    used for showing the buffer from being raised or selected.
 `reusable-frames' -- The value specifies the set of frames to
    search for a window that already displays the buffer.
    Possible values are nil (the selected frame), t (any live
    frame), visible (any visible frame), 0 (any visible or
    iconified frame) or an existing live frame.
 `pop-up-frame-parameters' -- The value specifies an alist of
    frame parameters to give a new frame, if one is created.
 `window-height' -- The value specifies the desired height of the
    window chosen and is either an integer (the total height of
    the window), a floating point number (the fraction of its
    total height with respect to the total height of the frame's
    root window) or a function to be called with one argument -
    the chosen window.  The function is supposed to adjust the
    height of the window; its return value is ignored.  Suitable
    functions are `shrink-window-if-larger-than-buffer' and
    `fit-window-to-buffer'.
 `window-width' -- The value specifies the desired width of the
    window chosen and is either an integer (the total width of
    the window), a floating point number (the fraction of its
    total width with respect to the width of the frame's root
    window) or a function to be called with one argument - the
    chosen window.  The function is supposed to adjust the width
    of the window; its return value is ignored.
 `preserve-size' -- The value should be either (t . nil) to
    preserve the width of the chosen window, (nil . t) to
    preserve its height or (t . t) to preserve its height and
    width in future changes of the window configuration.
 `window-parameters' -- The value specifies an alist of window
    parameters to give the chosen window.
 `allow-no-window' -- A non-nil value means that `display-buffer'
    may not display the buffer and return nil immediately.
 `body-function' -- A function called with one argument - the
    displayed window.  It is called after the buffer is
    displayed, and before `window-height', `window-width'
    and `preserve-size' are applied.  The function is supposed
    to fill the window body with some contents that might depend
    on dimensions of the displayed window.

The entries `window-height', `window-width' and `preserve-size'
are applied only when the window used for displaying the buffer
never showed another buffer before.

The ACTION argument can also have a non-nil and non-list value.
This means to display the buffer in a window other than the
selected one, even if it is already displayed in the selected
window.  If called interactively with a prefix argument, ACTION
is t.  Non-interactive calls should always supply a list or nil.

The optional third argument FRAME, if non-nil, acts like a
\(reusable-frames . FRAME) entry appended to the action alist
specified by the ACTION argument."
  (interactive (list (read-buffer "Display buffer: " (other-buffer))
		     (if current-prefix-arg t)))
  (let ((buffer (if (bufferp buffer-or-name)
		    buffer-or-name
		  (get-buffer buffer-or-name)))
	;; Make sure that when we split windows the old window keeps
	;; point, bug#14829.
	(split-window-keep-point t)
	;; Handle the old form of the first argument.
	(inhibit-same-window (and action (not (listp action)))))
    (unless (listp action) (setq action nil))
    (if display-buffer-function
	;; If `display-buffer-function' is defined, let it do the job.
	(funcall display-buffer-function buffer inhibit-same-window)
      ;; Otherwise, use the defined actions.
      (let* ((user-action
	      (display-buffer-assq-regexp
	       (buffer-name buffer) display-buffer-alist action))
             (special-action (display-buffer--special-action buffer))
	     ;; Extra actions from the arguments to this function:
	     (extra-action
	      (cons nil (append (if inhibit-same-window
				    '((inhibit-same-window . t)))
				(if frame
				    `((reusable-frames . ,frame))))))
	     ;; Construct action function list and action alist.
	     (actions (list display-buffer-overriding-action
			    user-action special-action action extra-action
			    display-buffer-base-action
			    display-buffer-fallback-action))
	     (functions (apply 'append
			       (mapcar (lambda (x)
					 (setq x (car x))
					 (if (functionp x) (list x) x))
				       actions)))
	     (alist (apply 'append (mapcar 'cdr actions)))
	     window)
	(unless (buffer-live-p buffer)
	  (error "Invalid buffer"))
	(while (and functions (not window))
	  (setq window (funcall (car functions) buffer alist)
	  	functions (cdr functions)))
	(and (windowp window) window)))))

(defun display-buffer-other-frame (buffer)
  "Display buffer BUFFER preferably in another frame.
This function attempts to look for a window displaying BUFFER,
on all the frames on the current terminal, skipping the selected
window; if that fails, it pops up a new frame.
This uses the function `display-buffer' as a subroutine; see
its documentation for additional customization information."
  (interactive "bDisplay buffer in other frame: ")
  (display-buffer buffer display-buffer--other-frame-action t))

;;; `display-buffer' action functions:

(defun display-buffer-use-some-frame (buffer alist)
  "Display BUFFER in an existing frame that meets a predicate.
The default predicate is to use any frame other than the selected
frame.  If successful, return the window used; otherwise return
nil.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `inhibit-switch-frame' entry, avoid
raising the frame.  If it has a non-nil `frame-predicate' entry,
its value is a function taking one argument (a frame), returning
non-nil if the frame is a candidate; this function replaces the
default predicate.  If ALIST has a non-nil `inhibit-same-window'
entry, avoid using the currently selected window (only useful
with a frame-predicate that allows using the selected frame).

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((predicate
          (or (cdr (assq 'frame-predicate alist))
              (lambda (frame)
                (and (not (eq frame (selected-frame)))
                     (get-lru-window frame)))))
         (frame (car (filtered-frame-list predicate)))
         (window
          (and frame
               (get-lru-window
                frame nil (cdr (assq 'inhibit-same-window alist))))))
    (when window
      (prog1
          (window--display-buffer buffer window 'reuse alist)
        (unless (cdr (assq 'inhibit-switch-frame alist))
          (window--maybe-raise-frame frame))))))

(defun display-buffer-same-window (buffer alist)
  "Display BUFFER in the selected window.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

This function fails if ALIST has an `inhibit-same-window'
element whose value is non-nil, or if the selected window is a
minibuffer window or is dedicated to another buffer; in that case,
return nil.  Otherwise, return the selected window.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (unless (or (cdr (assq 'inhibit-same-window alist))
	      (window-minibuffer-p)
	      (window-dedicated-p))
    (window--display-buffer buffer (selected-window) 'reuse alist)))

(defun display-buffer--maybe-same-window (buffer alist)
  "Conditionally display BUFFER in the selected window.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If `same-window-p' returns non-nil for BUFFER's name, call
`display-buffer-same-window' and return its value.  Otherwise,
return nil."
  (and (same-window-p (buffer-name buffer))
       (display-buffer-same-window buffer alist)))

(defun display-buffer-reuse-window (buffer alist)
  "Return a window that is already displaying BUFFER.
Preferably use a window on the selected frame if such a window
exists.  Return nil if no usable window is found.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `inhibit-same-window' entry, the selected
window is not eligible for reuse.

If ALIST contains a `reusable-frames' entry, its value determines
which frames to search for a reusable window:
  nil -- the selected frame (actually the last non-minibuffer frame)
  A frame   -- just that frame
  `visible' -- all visible frames
  0   -- all frames on the current terminal
  t   -- all frames.

If ALIST contains no `reusable-frames' entry, search just the
selected frame if `display-buffer-reuse-frames' and
`pop-up-frames' are both nil; search all frames on the current
terminal if either of those variables is non-nil.

If ALIST has a non-nil `inhibit-switch-frame' entry, then in the
event that a window on another frame is chosen, avoid raising
that frame.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((alist-entry (assq 'reusable-frames alist))
	 (frames (cond (alist-entry (cdr alist-entry))
		       ((if (eq pop-up-frames 'graphic-only)
			    (display-graphic-p)
			  pop-up-frames)
			0)
		       (display-buffer-reuse-frames 0)
		       (t (last-nonminibuffer-frame))))
	 (window (if (and (eq buffer (window-buffer))
			  (not (cdr (assq 'inhibit-same-window alist))))
		     (selected-window)
                   ;; Preferably use a window on the selected frame,
                   ;; if such a window exists (Bug#36680).
                   (let* ((windows (delq (selected-window)
                                         (get-buffer-window-list
                                          buffer 'nomini frames)))
                          (first (car windows))
                          (this-frame (selected-frame)))
                     (cond
                      ((eq (window-frame first) this-frame)
                       first)
                      ((catch 'found
                         (dolist (next (cdr windows))
                           (when (eq (window-frame next) this-frame)
                             (throw 'found next)))))
                      (t first))))))
    (when (window-live-p window)
      (prog1 (window--display-buffer buffer window 'reuse alist)
	(unless (cdr (assq 'inhibit-switch-frame alist))
	  (window--maybe-raise-frame (window-frame window)))))))

(defun display-buffer-reuse-mode-window (buffer alist)
  "Return a window based on the mode of the buffer it displays.
Display BUFFER in the returned window.  Return nil if no usable
window is found.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST contains a `mode' entry, its value is a major mode (a
symbol) or a list of modes.  A window is a candidate if it
displays a buffer that derives from one of the given modes.  When
ALIST contains no `mode' entry, the current major mode of BUFFER
is used.

The behavior is also controlled by entries for
`inhibit-same-window', `reusable-frames' and
`inhibit-switch-frame' as is done in the function
`display-buffer-reuse-window'.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((alist-entry (assq 'reusable-frames alist))
         (alist-mode-entry (assq 'mode alist))
	 (frames (cond (alist-entry (cdr alist-entry))
		       ((if (eq pop-up-frames 'graphic-only)
			    (display-graphic-p)
			  pop-up-frames)
			0)
		       (display-buffer-reuse-frames 0)
		       (t (last-nonminibuffer-frame))))
         (inhibit-same-window-p (cdr (assq 'inhibit-same-window alist)))
	 (windows (window-list-1 nil 'nomini frames))
         (buffer-mode (with-current-buffer buffer major-mode))
         (allowed-modes (if alist-mode-entry
                            (cdr alist-mode-entry)
                          buffer-mode))
         (curwin (selected-window))
         (curframe (selected-frame)))
    (unless (listp allowed-modes)
      (setq allowed-modes (list allowed-modes)))
    (let (same-mode-same-frame
          same-mode-other-frame
          derived-mode-same-frame
          derived-mode-other-frame)
      (dolist (window windows)
        (let ((mode?
               (with-current-buffer (window-buffer window)
                 (cond ((memq major-mode allowed-modes)
                        'same)
                       ((apply #'derived-mode-p allowed-modes)
                        'derived)))))
          (when (and mode?
                     (not (and inhibit-same-window-p
                               (eq window curwin))))
            (push window (if (eq curframe (window-frame window))
                             (if (eq mode? 'same)
                                 same-mode-same-frame
                               derived-mode-same-frame)
                           (if (eq mode? 'same)
                               same-mode-other-frame
                             derived-mode-other-frame))))))
      (let ((window (car (nconc same-mode-same-frame
                                same-mode-other-frame
                                derived-mode-same-frame
                                derived-mode-other-frame))))
        (when (window-live-p window)
          (prog1 (window--display-buffer buffer window 'reuse alist)
            (unless (cdr (assq 'inhibit-switch-frame alist))
              (window--maybe-raise-frame (window-frame window)))))))))

(defun display-buffer--special-action (buffer)
  "Return special display action for BUFFER, if any.
If `special-display-p' returns non-nil for BUFFER, return an
appropriate display action involving `special-display-function'.
See `display-buffer' for the format of display actions."
  (and special-display-function
       ;; `special-display-p' returns either t or a list of frame
       ;; parameters to pass to `special-display-function'.
       (let ((pars (special-display-p (buffer-name buffer))))
	 (when pars
           (list (list #'display-buffer-reuse-window
                       (lambda (buffer _alist)
                         (funcall special-display-function
                                  buffer (if (listp pars) pars)))))))))

(defun display-buffer-pop-up-frame (buffer alist)
  "Display BUFFER in a new frame.
This works by calling `pop-up-frame-function'.  If successful,
return the window used; otherwise return nil.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `inhibit-switch-frame' entry, avoid
raising the new frame.  A non-nil `pop-up-frame-parameters' entry
specifies an alist of frame parameters to give the new frame.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((params (cdr (assq 'pop-up-frame-parameters alist)))
	 (pop-up-frame-alist (append params pop-up-frame-alist))
	 (fun pop-up-frame-function)
	 frame window)
    (when (and fun
	       ;; Make BUFFER current so `make-frame' will use it as the
	       ;; new frame's buffer (Bug#15133).
	       (with-current-buffer buffer
		 (setq frame (funcall fun)))
	       (setq window (frame-selected-window frame)))
      (prog1 (window--display-buffer buffer window 'frame alist)
	(unless (cdr (assq 'inhibit-switch-frame alist))
	  (window--maybe-raise-frame frame))))))

(defun display-buffer-pop-up-window (buffer alist)
  "Display BUFFER by popping up a new window.
The new window is created on the selected frame, or in
`last-nonminibuffer-frame' if no windows can be created there.
If successful, return the new window; otherwise return nil.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `inhibit-switch-frame' entry, then in the
event that the new window is created on another frame, avoid
raising the frame.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let ((frame (or (window--frame-usable-p (selected-frame))
		   (window--frame-usable-p (last-nonminibuffer-frame))))
	window)
    (when (and (or (not (frame-parameter frame 'unsplittable))
		   ;; If the selected frame cannot be split, look at
		   ;; `last-nonminibuffer-frame'.
		   (and (eq frame (selected-frame))
			(setq frame (last-nonminibuffer-frame))
			(window--frame-usable-p frame)
			(not (frame-parameter frame 'unsplittable))))
	       ;; Attempt to split largest or least recently used window.
	       (setq window (or (window--try-to-split-window
				 (get-largest-window frame t) alist)
				(window--try-to-split-window
				 (get-lru-window frame t) alist))))

      (prog1 (window--display-buffer buffer window 'window alist)
	(unless (cdr (assq 'inhibit-switch-frame alist))
	  (window--maybe-raise-frame (window-frame window)))))))

(defun display-buffer--maybe-pop-up-frame-or-window (buffer alist)
  "Try displaying BUFFER based on `pop-up-frames' or `pop-up-windows'.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If `pop-up-frames' is non-nil (and not `graphic-only' on a
text-only terminal), try with `display-buffer-pop-up-frame'.  If
that cannot be done, and `pop-up-windows' is non-nil, try again
with `display-buffer-pop-up-window'."
  (or (display-buffer--maybe-pop-up-frame buffer alist)
      (display-buffer--maybe-pop-up-window buffer alist)))

(defun display-buffer--maybe-pop-up-frame (buffer alist)
  "Try displaying BUFFER based on `pop-up-frames'.
If `pop-up-frames' is non-nil (and not `graphic-only' on a
text-only terminal), try with `display-buffer-pop-up-frame'.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists."
  (and (if (eq pop-up-frames 'graphic-only)
	   (display-graphic-p)
	 pop-up-frames)
       (display-buffer-pop-up-frame buffer alist)))

(defun display-buffer--maybe-pop-up-window (buffer alist)
  "Try displaying BUFFER based on `pop-up-windows'.
If `pop-up-windows' is non-nil, try with `display-buffer-pop-up-window'."
  (and pop-up-windows
       (display-buffer-pop-up-window buffer alist)))

(defun display-buffer-in-child-frame (buffer alist)
  "Display BUFFER in a child frame.
By default, this either reuses a child frame of the selected
frame or makes a new child frame of the selected frame.  If
successful, return the window used; otherwise return nil.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `child-frame-parameters' entry, the
corresponding value is an alist of frame parameters to give the
new frame.  A `parent-frame' parameter specifying the selected
frame is provided by default.  If the child frame shall be or
become the child of any other frame, a corresponding entry must
be added to ALIST.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((parameters
          (append
           (cdr (assq 'child-frame-parameters alist))
           `((parent-frame . ,(selected-frame)))))
	 (parent (or (assq 'parent-frame parameters)
                     (selected-frame)))
         (share (assq 'share-child-frame parameters))
         share1 frame window type)
    (with-current-buffer buffer
      (when (frame-live-p parent)
        (catch 'frame
          (dolist (frame1 (frame-list))
            (when (eq (frame-parent frame1) parent)
              (setq share1 (assq 'share-child-frame
                                 (frame-parameters frame1)))
              (when (eq share share1)
                (setq frame frame1)
                (throw 'frame t))))))

      (if frame
          (progn
            (setq window (frame-selected-window frame))
            (setq type 'reuse))
        (setq frame (make-frame parameters))
        (setq window (frame-selected-window frame))
        (setq type 'frame)))

    (prog1 (window--display-buffer buffer window type alist)
      (unless (cdr (assq 'inhibit-switch-frame alist))
	(window--maybe-raise-frame frame)))))

(defun windows-sharing-edge (&optional window edge within)
  "Return list of live windows sharing the same edge with WINDOW.
WINDOW must be a valid window and defaults to the selected one.
EDGE stands for the edge to share and must be either `left',
`above', `right' or `below'.  Omitted or nil, EDGE defaults to
`left'.

WITHIN nil means to find a live window that shares the opposite
EDGE with WINDOW.  For example, if EDGE equals `left', WINDOW has
to share (part of) the right edge of any window returned.  WITHIN
non-nil means to find all live windows that share the same EDGE
with WINDOW (Window must be internal in this case).  So if EDGE
equals `left', WINDOW's left edge has to fully encompass the left
edge of any window returned."
  (setq window (window-normalize-window window))
  (setq edge (or edge 'left))
  (when (and within (window-live-p window))
    (error "Cannot share edge from within live window %s" window))
  (let ((window-edges (window-edges window nil nil t))
	(horizontal (memq edge '(left right)))
	(n (pcase edge
	     ('left 0) ('above 1) ('right 2) ('below 3))))
    (unless (numberp n)
      (error "Invalid EDGE %s" edge))
    (let ((o (mod (+ 2 n) 4))
	  (p (if horizontal 1 0))
	  (q (if horizontal 3 2))
	  windows)
      (walk-window-tree
       (lambda (other)
	 (let ((other-edges (window-edges other nil nil t)))
	   (when (and (not (eq window other))
		      (= (nth n window-edges)
			 (nth (if within n o) other-edges))
		      (cond
		       ((= (nth p window-edges) (nth p other-edges)))
		       ((< (nth p window-edges) (nth p other-edges))
			(< (nth p other-edges) (nth q window-edges)))
		       (t
			(< (nth p window-edges) (nth q other-edges)))))
	     (setq windows (cons other windows)))))
       (window-frame window) nil 'nomini)
      (reverse windows))))

(defun window--try-to-split-window-in-direction (window direction alist)
  "Try to split WINDOW in DIRECTION.
DIRECTION is passed as SIDE argument to `split-window-no-error'.
ALIST is a buffer display alist."
  (and (not (frame-parameter (window-frame window) 'unsplittable))
       (let* ((window-combination-limit
	       ;; When `window-combination-limit' equals
	       ;; `display-buffer' or equals `resize-window' and a
	       ;; `window-height' or `window-width' alist entry are
	       ;; present, bind it to t so resizing steals space
	       ;; preferably from the window that was split.
	       (if (or (eq window-combination-limit 'display-buffer)
		       (and (eq window-combination-limit 'window-size)
			    (or (cdr (assq 'window-height alist))
				(cdr (assq 'window-width alist)))))
		   t
		 window-combination-limit))
	      (new-window (split-window-no-error window nil direction)))
	 (and (window-live-p new-window) new-window))))

(defun display-buffer-in-direction (buffer alist)
  "Try to display BUFFER in a direction specified by ALIST.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

ALIST has to contain a `direction' entry whose value should be
one of `left', `above' (or `up'), `right' and `below' (or `down').
Other values are usually interpreted as `below'.

If ALIST also contains a `window' entry, its value specifies a
reference window.  That value can be a special symbol like
`main' (which stands for the selected frame's main window) or
`root' (standings for the selected frame's root window) or an
arbitrary valid window.  Any other value (or omitting the
`window' entry) means to use the selected window as reference
window.

This function tries to reuse or split a window such that the
window produced this way is on the side of the reference window
specified by the `direction' entry.

Four special values for `direction' entries allow to implicitly
specify the selected frame's main window as reference window:
`leftmost', `top', `rightmost' and `bottom'.  Hence, instead of
`(direction . left) (window . main)' one can simply write
`(direction . leftmost)'.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let ((direction (cdr (assq 'direction alist))))
    (when direction
      (let ((window (cdr (assq 'window alist)))
	    within windows other-window-shows-buffer other-window)
	;; Sanitize WINDOW.
	(cond
	 ((or (eq window 'main)
              (memq direction '(top bottom leftmost rightmost)))
	  (setq window (window-main-window)))
	 ((eq window 'root)
	  (setq window (frame-root-window)))
	 ((window-valid-p window))
	 (t
	  (setq window (selected-window))))
	(setq within (not (window-live-p window)))
	;; Sanitize DIRECTION
	(cond
	 ((memq direction '(left above right below)))
	 ((eq direction 'leftmost)
	  (setq direction 'left))
	 ((memq direction '(top up))
	  (setq direction 'above))
	 ((eq direction 'rightmost)
	  (setq direction 'right))
	 ((memq direction '(bottom down))
	  (setq direction 'below))
	 (t
	  (setq direction 'below)))

	(setq alist
	      (append alist
		      `(,(if temp-buffer-resize-mode
		             '(window-height . resize-temp-buffer-window)
	                   '(window-height . fit-window-to-buffer))
	                ,(when temp-buffer-resize-mode
	                   '(preserve-size . (nil . t))))))

	(setq windows (windows-sharing-edge window direction within))
	(dolist (other windows)
	  (cond
	   ((and (not other-window-shows-buffer)
		 (eq buffer (window-buffer other)))
	    (setq other-window-shows-buffer t)
	    (setq other-window other))
	   ((not other-window)
	    (setq other-window other))))
	(or (and other-window-shows-buffer
		 (window--display-buffer buffer other-window 'reuse alist))
	    (and (setq other-window
		       (window--try-to-split-window-in-direction
			window direction alist))
		 (window--display-buffer buffer other-window 'window alist))
	    (and (setq window other-window)
		 (not (window-dedicated-p other-window))
		 (not (window-minibuffer-p other-window))
		 (window--display-buffer buffer other-window 'reuse alist)))))))

;; This should be rewritten as
;; (display-buffer-in-direction buffer (cons '(direction . below) alist))
(defun display-buffer-below-selected (buffer alist)
  "Try displaying BUFFER in a window below the selected window.
If there is a window below the selected one and that window
already displays BUFFER, use that window.  Otherwise, try to
create a new window below the selected one and show BUFFER there.
If that attempt fails as well and there is a non-dedicated window
below the selected one, use that window.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST contains a `window-min-height' entry, this function
ensures that the window used is or can become at least as high as
specified by that entry's value.  Note that such an entry alone
will not resize the window per se.  In order to do that, ALIST
must also contain a `window-height' entry with the same value.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let ((min-height (cdr (assq 'window-min-height alist)))
	window)
    (or (and (setq window (window-in-direction 'below))
             (eq buffer (window-buffer window))
	     (or (not (numberp min-height))
		 (>= (window-height window) min-height)
		 ;; 'window--display-buffer' can resize this window if
		 ;; and only if it has a 'quit-restore' parameter
		 ;; certifying that it always showed BUFFER before.
		 (let ((height (window-height window))
		       (quit-restore (window-parameter window 'quit-restore)))
		   (and quit-restore
			(eq (nth 1 quit-restore) 'window)
			(window-resizable-p window (- min-height height)))))
	     (window--display-buffer buffer window 'reuse alist))
	(and (not (frame-parameter nil 'unsplittable))
             (or (not (numberp min-height))
		 (window-sizable-p nil (- min-height)))
             (let ((split-height-threshold 0)
		   split-width-threshold)
               (setq window (window--try-to-split-window
                             (selected-window) alist)))
             (window--display-buffer buffer window 'window alist))
	(and (setq window (window-in-direction 'below))
             (not (window-dedicated-p window))
	     (or (not (numberp min-height))
		 ;; A window that showed another buffer before cannot
		 ;; be resized.
		 (>= (window-height window) min-height))
	     (window--display-buffer buffer window 'reuse alist)))))

(defun display-buffer--maybe-at-bottom (buffer alist)
  (let ((alist (append alist `(,(if temp-buffer-resize-mode
		                    '(window-height . resize-temp-buffer-window)
	                          '(window-height . fit-window-to-buffer))
	                       ,(when temp-buffer-resize-mode
	                          '(preserve-size . (nil . t)))))))
    (or (display-buffer--maybe-same-window buffer alist)
        (display-buffer-reuse-window buffer alist)
        (display-buffer--maybe-pop-up-frame buffer alist)
        (display-buffer-at-bottom buffer alist))))

;; This should be rewritten as
;; (display-buffer-in-direction buffer (cons '(direction . bottom) alist))
(defun display-buffer-at-bottom (buffer alist)
  "Try displaying BUFFER in a window at the bottom of the selected frame.
This either reuses such a window provided it shows BUFFER
already, splits a window at the bottom of the frame or the
frame's root window, or reuses some window at the bottom of the
selected frame.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let (bottom-window bottom-window-shows-buffer window)
    (walk-window-tree
     (lambda (window)
       (cond
	((window-in-direction 'below window))
	((and (not bottom-window-shows-buffer)
	      (eq buffer (window-buffer window)))
	 (setq bottom-window-shows-buffer t)
	 (setq bottom-window window))
	((not bottom-window)
	 (setq bottom-window window))))
     nil nil 'nomini)
    (or (and bottom-window-shows-buffer
	     (window--display-buffer buffer bottom-window 'reuse alist))
	(and (not (frame-parameter nil 'unsplittable))
	     (setq window (split-window-no-error (window-main-window)))
	     (window--display-buffer buffer window 'window alist))
	(and (setq window bottom-window)
	     (not (window-dedicated-p window))
	     (window--display-buffer buffer window 'reuse alist)))))

(defun display-buffer-in-previous-window (buffer alist)
  "Display BUFFER in a window previously showing it.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `inhibit-same-window' entry, the selected
window is not usable.  A dedicated window is usable only if it
already shows BUFFER.  If ALIST contains a `previous-window'
entry, the window specified by that entry (either a variable
or a value) is usable even if it never showed BUFFER before.

If ALIST contains a `reusable-frames' entry, its value determines
which frames to search for a usable window:
  nil -- the selected frame (actually the last non-minibuffer frame)
  A frame   -- just that frame
  `visible' -- all visible frames
  0   -- all frames on the current terminal
  t   -- all frames.

If ALIST contains no `reusable-frames' entry, search just the
selected frame if `display-buffer-reuse-frames' and
`pop-up-frames' are both nil; search all frames on the current
terminal if either of those variables is non-nil.

If more than one window is usable according to these rules,
apply the following order of preference:

- Use the window specified by any `previous-window' ALIST entry,
  provided it is not the selected window.

- Use a window that showed BUFFER before, provided it is not the
  selected window.

- Use the selected window if it is either specified by a
  `previous-window' ALIST entry or showed BUFFER before.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((alist-entry (assq 'reusable-frames alist))
	 (inhibit-same-window
	  (cdr (assq 'inhibit-same-window alist)))
	 (frames (cond
		  (alist-entry (cdr alist-entry))
		  ((if (eq pop-up-frames 'graphic-only)
		       (display-graphic-p)
		     pop-up-frames)
		   0)
		  (display-buffer-reuse-frames 0)
		  (t (last-nonminibuffer-frame))))
         (previous-window (cdr (assq 'previous-window alist)))
	 best-window second-best-window window)
    ;; Scan windows whether they have shown the buffer recently.
    (catch 'best
      (dolist (window (window-list-1 (frame-first-window) 'nomini frames))
	(when (and (assq buffer (window-prev-buffers window))
		   (not (window-dedicated-p window)))
	  (if (eq window (selected-window))
	      (unless inhibit-same-window
		(setq second-best-window window))
	    (setq best-window window)
	    (throw 'best t)))))
    ;; When ALIST has a `previous-window' entry, that entry may override
    ;; anything we found so far.
    (when (and previous-window (boundp previous-window))
      (setq previous-window (symbol-value previous-window)))
    (when (and (setq window previous-window)
	       (window-live-p window)
	       (or (eq buffer (window-buffer window))
                   (not (window-dedicated-p window))))
      (if (eq window (selected-window))
	  (unless inhibit-same-window
	    (setq second-best-window window))
	(setq best-window window)))
    ;; Return best or second best window found.
    (when (setq window (or best-window second-best-window))
      (window--display-buffer buffer window 'reuse alist))))

(defun display-buffer-use-least-recent-window (buffer alist)
  "Display BUFFER in an existing window, but that hasn't been used lately.
This `display-buffer' action function is like
`display-buffer-use-some-window', but will cycle through windows
when displaying buffers repeatedly, and if there's only a single
window, it will split the window."
  (when-let ((window (display-buffer-use-some-window
                      buffer (cons (cons 'inhibit-same-window t) alist))))
    (window-bump-use-time window)))

(defun display-buffer-use-some-window (buffer alist)
  "Display BUFFER in an existing window.
Search for a usable window, set that window to the buffer, and
return the window.  If no suitable window is found, return nil.

ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST has a non-nil `inhibit-switch-frame' entry, then in the
event that a window on another frame is chosen, avoid raising
that frame.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let* ((not-this-window (cdr (assq 'inhibit-same-window alist)))
	 (frame (or (window--frame-usable-p (selected-frame))
		    (window--frame-usable-p (last-nonminibuffer-frame))))
	 (window
	  ;; Reuse an existing window.
	  (or (get-lru-window frame nil not-this-window)
	      (let ((window (get-buffer-window buffer 'visible)))
		(unless (and not-this-window
			     (eq window (selected-window)))
		  window))
	      (get-largest-window 'visible nil not-this-window)
	      (let ((window (get-buffer-window buffer 0)))
		(unless (and not-this-window
			     (eq window (selected-window)))
		  window))
	      (get-largest-window 0 nil not-this-window)))
	 (quit-restore (and (window-live-p window)
			    (window-parameter window 'quit-restore)))
	 (quad (nth 1 quit-restore)))
    (when (window-live-p window)
      ;; If the window was used by `display-buffer' before, try to
      ;; resize it to its old height but don't signal an error.
      (when (and (listp quad)
		 (integerp (nth 3 quad))
		 (> (nth 3 quad) (window-total-height window)))
	(condition-case nil
	    (window-resize window (- (nth 3 quad) (window-total-height window)))
	  (error nil)))

      (prog1
	  (window--display-buffer buffer window 'reuse alist)
	(window--even-window-sizes window)
	(unless (cdr (assq 'inhibit-switch-frame alist))
	  (window--maybe-raise-frame (window-frame window)))))))

(defun display-buffer-no-window (_buffer alist)
  "Display BUFFER in no window.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST contains a non-nil `allow-no-window' entry, do nothing
and return `fail'.  This allows `display-buffer' to override the
default action and avoid displaying the buffer.  It is assumed
that when the caller specifies a non-nil `allow-no-window' ALIST
entry, it can handle a nil value returned by `display-buffer'.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (when (cdr (assq 'allow-no-window alist))
    'fail))

;;; Display + selection commands:
(defun pop-to-buffer (buffer-or-name &optional action norecord)
  "Display buffer specified by BUFFER-OR-NAME and select its window.
BUFFER-OR-NAME may be a buffer, a string (a buffer name), or nil.
If it is a string not naming an existent buffer, create a buffer
with that name.  If BUFFER-OR-NAME is nil, choose some other
buffer.  In either case, make that buffer current and return it.

This uses `display-buffer' as a subroutine.  The optional ACTION
argument is passed to `display-buffer' as its ACTION argument.
See `display-buffer' for more information.  ACTION is t if called
interactively with a prefix argument, which means to pop to a
window other than the selected one even if the buffer is already
displayed in the selected window.

If a suitable window is found, select that window.  If it is not
on the selected frame, raise that window's frame and give it
input focus.

Optional third arg NORECORD non-nil means do not put this buffer
at the front of the list of recently selected ones."
  (interactive (list (read-buffer "Pop to buffer: " (other-buffer))
		     (if current-prefix-arg t)))
  (let* ((buffer (window-normalize-buffer-to-switch-to buffer-or-name))
         (old-frame (selected-frame))
	 (window (display-buffer buffer action)))
    ;; Don't assume that `display-buffer' has supplied us with a window
    ;; (Bug#24332).
    (if window
        (let ((frame (window-frame window)))
          ;; If we chose another frame, make sure it gets input focus.
          (unless (eq frame old-frame)
            (select-frame-set-input-focus frame norecord))
          ;; Make sure the window is selected (Bug#8615), (Bug#6954)
          (select-window window norecord))
      ;; If `display-buffer' failed to supply a window, just make the
      ;; buffer current.
      (set-buffer buffer))
    ;; Return BUFFER even when we got no window.
    buffer))

(defun pop-to-buffer-same-window (buffer &optional norecord)
  "Select buffer BUFFER in some window, preferably the same one.
BUFFER may be a buffer, a string (a buffer name), or nil.  If it
is a string not naming an existent buffer, create a buffer with
that name.  If BUFFER is nil, choose some other buffer.  Return
the buffer.

Optional argument NORECORD, if non-nil means do not put this
buffer at the front of the list of recently selected ones.

Unlike `pop-to-buffer', this function prefers using the selected
window over popping up a new window or frame.  Specifically, if
the selected window is neither a minibuffer window (as reported
by `window-minibuffer-p'), nor is dedicated to another buffer
(see `window-dedicated-p'), BUFFER will be displayed in the
currently selected window; otherwise it will be displayed in
another window."
  (pop-to-buffer buffer display-buffer--same-window-action norecord))

(defun read-buffer-to-switch (prompt)
  "Read the name of a buffer to switch to, prompting with PROMPT.
Return the name of the buffer as a string.

This function is intended for the `switch-to-buffer' family of
commands since these need to omit the name of the current buffer
from the list of completions and default values."
  (let ((rbts-completion-table (internal-complete-buffer-except)))
    (minibuffer-with-setup-hook
        (lambda ()
          (setq minibuffer-completion-table rbts-completion-table)
          ;; Since rbts-completion-table is built dynamically, we
          ;; can't just add it to the default value of
          ;; icomplete-with-completion-tables, so we add it
          ;; here manually.
          (if (and (boundp 'icomplete-with-completion-tables)
                   (listp icomplete-with-completion-tables))
              (setq-local icomplete-with-completion-tables
                          (cons rbts-completion-table
                                icomplete-with-completion-tables))))
      (read-buffer prompt (other-buffer (current-buffer))
                   (confirm-nonexistent-file-or-buffer)))))

(defun window-normalize-buffer-to-switch-to (buffer-or-name)
  "Normalize BUFFER-OR-NAME argument of buffer switching functions.
If BUFFER-OR-NAME is nil, return the buffer returned by
`other-buffer'.  Else, if a buffer specified by BUFFER-OR-NAME
exists, return that buffer.  If no such buffer exists, create a
buffer with the name BUFFER-OR-NAME and return that buffer."
  (if buffer-or-name
      (or (get-buffer buffer-or-name)
	  (let ((buffer (get-buffer-create buffer-or-name)))
	    (set-buffer-major-mode buffer)
	    buffer))
    (other-buffer)))

(defcustom switch-to-buffer-preserve-window-point t
  "If non-nil, `switch-to-buffer' tries to preserve `window-point'.
If this is nil, `switch-to-buffer' displays the buffer at that
buffer's `point'.  If this is `already-displayed', it tries to
display the buffer at its previous position in the selected
window, provided the buffer is currently displayed in some other
window on any visible or iconified frame.  If this is t, it
unconditionally tries to display the buffer at its previous
position in the selected window.

This variable is ignored if the buffer is already displayed in
the selected window or never appeared in it before, or if
`switch-to-buffer' calls `pop-to-buffer' to display the buffer,
or non-nil `switch-to-buffer-obey-display-actions' displays it
in another window."
  :type '(choice
	  (const :tag "Never" nil)
	  (const :tag "If already displayed elsewhere" already-displayed)
	  (const :tag "Always" t))
  :group 'windows
  :version "26.1")

(defcustom switch-to-buffer-in-dedicated-window nil
  "Allow switching to buffer in strongly dedicated windows.
If non-nil, allow `switch-to-buffer' to proceed when called
interactively and the selected window is strongly dedicated to
its buffer.

The following values are recognized:

nil - disallow switching; signal an error

prompt - prompt user whether to allow switching

pop - perform `pop-to-buffer' instead

t - undedicate selected window and switch

When called non-interactively, `switch-to-buffer' always signals
an error when the selected window is dedicated to its buffer and
FORCE-SAME-WINDOW is non-nil."
  :type '(choice
	  (const :tag "Disallow" nil)
	  (const :tag "Prompt" prompt)
	  (const :tag "Pop" pop)
	  (const :tag "Allow" t))
  :group 'windows
  :version "25.1")

(defcustom switch-to-buffer-obey-display-actions nil
  "If non-nil, `switch-to-buffer' runs `pop-to-buffer-same-window' instead.
This means that when switching the buffer it respects display actions
specified by `display-buffer-overriding-action', `display-buffer-alist'
and other display related variables.  So `switch-to-buffer' will display
the buffer in the window specified by the rules from these variables."
  :type 'boolean
  :group 'windows
  :version "27.1")

(defun switch-to-buffer (buffer-or-name &optional norecord force-same-window)
  "Display buffer BUFFER-OR-NAME in the selected window.

WARNING: This is NOT the way to work on another buffer temporarily
within a Lisp program!  Use `set-buffer' instead.  That avoids
messing with the window-buffer correspondences.

If the selected window cannot display the specified buffer
because it is a minibuffer window or strongly dedicated to
another buffer, call `pop-to-buffer' to select the buffer in
another window.  In interactive use, if the selected window is
strongly dedicated to its buffer, the value of the option
`switch-to-buffer-in-dedicated-window' specifies how to proceed.

If called interactively, read the buffer name using `read-buffer'.
The variable `confirm-nonexistent-file-or-buffer' determines
whether to request confirmation before creating a new buffer.
See `read-buffer' for features related to input and completion
of buffer names.

BUFFER-OR-NAME may be a buffer, a string (a buffer name), or nil.
If BUFFER-OR-NAME is a string that does not identify an existing
buffer, create a buffer with that name.  If BUFFER-OR-NAME is
nil, switch to the buffer returned by `other-buffer'.

If optional argument NORECORD is non-nil, do not put the buffer
at the front of the buffer list, and do not make the window
displaying it the most recently selected one.

If optional argument FORCE-SAME-WINDOW is non-nil, the buffer
must be displayed in the selected window when called
non-interactively; if that is impossible, signal an error rather
than calling `pop-to-buffer'.  It has no effect when the option
`switch-to-buffer-obey-display-actions' is non-nil.

The option `switch-to-buffer-preserve-window-point' can be used
to make the buffer appear at its last position in the selected
window.

If the option `switch-to-buffer-obey-display-actions' is non-nil,
run the function `pop-to-buffer-same-window' instead.
This may display the buffer in another window as specified by
`display-buffer-overriding-action', `display-buffer-alist' and
other display related variables.  If this results in displaying
the buffer in the selected window, window start and point are adjusted
as prescribed by the option `switch-to-buffer-preserve-window-point'.
Otherwise, these are left alone.

Return the buffer switched to."
  (interactive
   (let ((force-same-window
          (unless switch-to-buffer-obey-display-actions
            (cond
             ((window-minibuffer-p) nil)
             ((not (eq (window-dedicated-p) t)) 'force-same-window)
             ((pcase switch-to-buffer-in-dedicated-window
                ('nil (user-error
                       "Cannot switch buffers in a dedicated window"))
                ('prompt
                 (if (y-or-n-p
                      (format "Window is dedicated to %s; undedicate it"
                              (window-buffer)))
                     (progn
                       (set-window-dedicated-p nil nil)
                       'force-same-window)
                   (user-error
                    "Cannot switch buffers in a dedicated window")))
                ('pop nil)
                (_ (set-window-dedicated-p nil nil) 'force-same-window)))))))
     (list (read-buffer-to-switch "Switch to buffer: ") nil force-same-window)))
  (let ((buffer (window-normalize-buffer-to-switch-to buffer-or-name))
        (set-window-start-and-point (not switch-to-buffer-obey-display-actions)))
    (cond
     ;; Don't call set-window-buffer if it's not needed since it
     ;; might signal an error (e.g. if the window is dedicated).
     ((and (eq buffer (window-buffer))
           ;; pop-to-buffer-same-window might decide to display
           ;; the same buffer in another window
           (not switch-to-buffer-obey-display-actions)))
     ((and (window-minibuffer-p)
           (not switch-to-buffer-obey-display-actions))
      (if force-same-window
          (user-error "Cannot switch buffers in minibuffer window")
        (pop-to-buffer buffer norecord)))
     ((and (eq (window-dedicated-p) t)
           (not switch-to-buffer-obey-display-actions))
      (if force-same-window
          (user-error "Cannot switch buffers in a dedicated window")
        (pop-to-buffer buffer norecord)))
     (t
      (when switch-to-buffer-obey-display-actions
        (let ((selected-window (selected-window)))
          (pop-to-buffer-same-window buffer norecord)
          (when (eq (selected-window) selected-window)
            (setq set-window-start-and-point t))))

      (when set-window-start-and-point
        (let* ((entry (assq buffer (window-prev-buffers)))
               (preserve-win-point
                (buffer-local-value 'switch-to-buffer-preserve-window-point
                                    buffer))
	       (displayed (and (eq preserve-win-point 'already-displayed)
			       (get-buffer-window buffer 0))))
	  (set-window-buffer nil buffer)
	  (when (and entry (or (eq preserve-win-point t) displayed))
	    ;; Try to restore start and point of buffer in the selected
	    ;; window (Bug#4041).
	    (set-window-start (selected-window) (nth 1 entry) t)
	    (set-window-point nil (nth 2 entry)))))))

    (unless norecord
      (select-window (selected-window)))
    (set-buffer buffer)))

(defun switch-to-buffer-other-window (buffer-or-name &optional norecord)
  "Select the buffer specified by BUFFER-OR-NAME in another window.
BUFFER-OR-NAME may be a buffer, a string (a buffer name), or
nil.  Return the buffer switched to.

If called interactively, read the buffer name using `read-buffer'.
The variable `confirm-nonexistent-file-or-buffer' determines
whether to request confirmation before creating a new buffer.
See `read-buffer' for features related to input and completion
of buffer names.

If BUFFER-OR-NAME is a string and does not identify an existing
buffer, create a new buffer with that name.  If BUFFER-OR-NAME is
nil, switch to the buffer returned by `other-buffer'.

Optional second argument NORECORD non-nil means do not put this
buffer at the front of the list of recently selected ones.

This uses the function `display-buffer' as a subroutine; see its
documentation for additional customization information."
  (interactive
   (list (read-buffer-to-switch "Switch to buffer in other window: ")))
  (let ((pop-up-windows t))
    (pop-to-buffer buffer-or-name t norecord)))

(defun switch-to-buffer-other-frame (buffer-or-name &optional norecord)
  "Switch to buffer BUFFER-OR-NAME in another frame.
BUFFER-OR-NAME may be a buffer, a string (a buffer name), or
nil.  Return the buffer switched to.

If called interactively, read the buffer name using `read-buffer'.
The variable `confirm-nonexistent-file-or-buffer' determines
whether to request confirmation before creating a new buffer.
See `read-buffer' for features related to input and completion
of buffer names.

If BUFFER-OR-NAME is a string and does not identify an existing
buffer, create a new buffer with that name.  If BUFFER-OR-NAME is
nil, switch to the buffer returned by `other-buffer'.

Optional second arg NORECORD non-nil means do not put this
buffer at the front of the list of recently selected ones.

This uses the function `display-buffer' as a subroutine; see its
documentation for additional customization information."
  (interactive
   (list (read-buffer-to-switch "Switch to buffer in other frame: ")))
  (pop-to-buffer buffer-or-name display-buffer--other-frame-action norecord))

(defun display-buffer-override-next-command (pre-function &optional post-function echo)
  "Set `display-buffer-overriding-action' for the next command.
`pre-function' is called to prepare the window where the buffer should be
displayed.  This function takes two arguments `buffer' and `alist', and
should return a cons with the displayed window and its type.  See the
meaning of these values in `window--display-buffer'.
Optional `post-function' is called after the buffer is displayed in the
window; the function takes two arguments: an old and new window.
Optional string argument `echo' can be used to add a prefix to the
command echo keystrokes that should describe the current prefix state.
This returns an \"exit function\", which can be called with no argument
to deactivate this overriding action."
  (let* ((old-window (or (minibuffer-selected-window) (selected-window)))
         (new-window nil)
         (minibuffer-depth (minibuffer-depth))
         (clearfun (make-symbol "clear-display-buffer-overriding-action"))
         (action (lambda (buffer alist)
                   (unless (> (minibuffer-depth) minibuffer-depth)
                     (let* ((ret (funcall pre-function buffer alist))
                            (window (car ret))
                            (type (cdr ret)))
                       (setq new-window (window--display-buffer buffer window
                                                                type alist))
                       ;; Reset display-buffer-overriding-action
                       ;; after the first buffer display action
                       (funcall clearfun)
                       (setq post-function nil)
                       new-window))))
         (command this-command)
         (echofun (when echo (lambda () echo)))
         (exitfun
          (lambda ()
            (setcar display-buffer-overriding-action
                    (delq action (car display-buffer-overriding-action)))
            (remove-hook 'post-command-hook clearfun)
            (remove-hook 'prefix-command-echo-keystrokes-functions echofun)
            (when (functionp post-function)
              (funcall post-function old-window new-window)))))
    (fset clearfun
          (lambda ()
            (unless (or
		     ;; Remove the hook immediately
		     ;; after exiting the minibuffer.
		     (> (minibuffer-depth) minibuffer-depth)
		     ;; But don't remove immediately after
		     ;; adding the hook by the same command below.
		     (eq this-command command))
              (funcall exitfun))))
    ;; Reset display-buffer-overriding-action
    ;; after the next command finishes
    (add-hook 'post-command-hook clearfun)
    (when echofun
      (add-hook 'prefix-command-echo-keystrokes-functions echofun))
    (push action (car display-buffer-overriding-action))
    exitfun))

\f
(defun set-window-text-height (window height)
  "Set the height in lines of the text display area of WINDOW to HEIGHT.
WINDOW must be a live window and defaults to the selected one.
HEIGHT doesn't include the mode line or header line, if any, or
any partial-height lines in the text display area.

Note that the current implementation of this function cannot
always set the height exactly, but attempts to be conservative,
by allocating more lines than are actually needed in the case
where some error may be present."
  (setq window (window-normalize-window window t))
  (let ((delta (- height (window-text-height window))))
    (unless (zerop delta)
      ;; Setting window-min-height to a value like 1 can lead to very
      ;; bizarre displays because it also allows Emacs to make *other*
      ;; windows one line tall, which means that there's no more space
      ;; for the mode line.
      (let ((window-min-height (min 2 height)))
	(window-resize window delta)))))

(defun enlarge-window-horizontally (delta)
  "Make selected window DELTA columns wider.
Interactively, if no argument is given, make selected window one
column wider."
  (interactive "p")
  (enlarge-window delta t))

(defun shrink-window-horizontally (delta)
  "Make selected window DELTA columns narrower.
Interactively, if no argument is given, make selected window one
column narrower."
  (interactive "p")
  (shrink-window delta t))

(defun count-screen-lines (&optional beg end count-final-newline window)
  "Return the number of screen lines in the region.
The number of screen lines may be different from the number of actual lines,
due to line breaking, display table, etc.

Optional arguments BEG and END default to `point-min' and `point-max'
respectively.

If region ends with a newline, ignore it unless optional third argument
COUNT-FINAL-NEWLINE is non-nil.

The optional fourth argument WINDOW specifies the window used for obtaining
parameters such as width, horizontal scrolling, and so on.  The default is
to use the selected window's parameters.

Like `vertical-motion', `count-screen-lines' always uses the current buffer,
regardless of which buffer is displayed in WINDOW.  This makes possible to use
`count-screen-lines' in any buffer, whether or not it is currently displayed
in some window."
  (unless beg
    (setq beg (point-min)))
  (unless end
    (setq end (point-max)))
  (if (= beg end)
      0
    (let ((start (min beg end))
          (finish (max beg end))
          count end-invisible-p)
      ;; When END is invisible because lines are truncated in WINDOW,
      ;; vertical-motion returns a number that is 1 larger than it
      ;; should.  We need to fix that.
      (setq end-invisible-p
            (and (or truncate-lines
                     (and (natnump truncate-partial-width-windows)
                          (< (window-total-width window)
                             truncate-partial-width-windows)))
                 (save-excursion
                   (goto-char finish)
                   (> (- (current-column) (window-hscroll window))
                      (window-body-width window)))))
      (save-excursion
        (save-restriction
          (widen)
          (narrow-to-region start
                            (if (and (not count-final-newline)
                                     (= ?\n (char-before finish)))
                                (1- finish)
                              finish))
          (goto-char start)
          (setq count (vertical-motion (buffer-size) window))
          (if end-invisible-p count (1+ count)))))))

(defun window-buffer-height (window)
  "Return the height (in screen lines) of the buffer that WINDOW is displaying.
WINDOW must be a live window and defaults to the selected one."
  (setq window (window-normalize-window window t))
  (with-current-buffer (window-buffer window)
    (max 1
	 (count-screen-lines (point-min) (point-max)
			     ;; If buffer ends with a newline, ignore it when
			     ;; counting height unless point is after it.
			     (eobp)
			     window))))

(defun window-default-font-height (&optional window)
  "Return height in pixels of WINDOW's default face font.
WINDOW must be a live window and defaults to the selected one.

The return value accounts for any remapping of the default face
font on WINDOW's frame."
  (let* ((window (window-normalize-window window t))
	 (frame (window-frame window))
	 (default-font (face-font 'default frame)))
    ;; Client frames can have the 'display' parameter set like for X
    ;; frames, even though they are TTY frames, so make sure we won't
    ;; be duped by that up front with 'framep'.
    (if (and (not (eq (framep frame) t))
             (display-multi-font-p (frame-parameter frame 'display))
	     (not (string-equal (frame-parameter frame 'font) default-font)))
        (aref (font-info default-font frame) 3)
      (frame-char-height frame))))

(defun window-default-line-height (&optional window)
  "Return height in pixels of a text line in WINDOW.
WINDOW must be a live window and defaults to the selected one.

The return value includes any line spacing defined for WINDOW's
buffer or frame and accounts for any remapping of the default
face on WINDOW's frame."
  (let* ((window (window-normalize-window window t))
	 (font-height (window-default-font-height window))
	 (frame (window-frame window))
	 (buffer (window-buffer window))
	 (space-height
	  (or (and (display-graphic-p frame)
		   (or (buffer-local-value 'line-spacing buffer)
		       (frame-parameter frame 'line-spacing)))
	      0)))
    (+ font-height
       (if (floatp space-height)
           (truncate (* (frame-char-height frame) space-height))
         space-height))))

;;; Resizing windows and frames to fit their contents exactly.
(defcustom fit-window-to-buffer-horizontally nil
  "Non-nil means `fit-window-to-buffer' can resize windows horizontally.
If this is nil, `fit-window-to-buffer' never resizes windows
horizontally.  If this is `only', it can resize windows
horizontally only.  Any other value means `fit-window-to-buffer'
can resize windows in both dimensions."
  :type 'boolean
  :version "24.4"
  :group 'help)

;; `fit-frame-to-buffer' eventually wants to know the real frame sizes
;; counting title bar and outer borders.
(defcustom fit-frame-to-buffer nil
  "Non-nil means `fit-window-to-buffer' can fit a frame to its buffer.
A frame is fit if and only if its root window is a live window
and this option is non-nil.  If this is `horizontally', frames
are resized horizontally only.  If this is `vertically', frames
are resized vertically only.  Any other non-nil value means
frames can be resized in both dimensions."
  :type 'boolean
  :version "24.4"
  :group 'help)

(defcustom fit-frame-to-buffer-margins '(nil nil nil nil)
  "Margins around frame for `fit-frame-to-buffer'.
This specifies the numbers of pixels to be left free on the left,
above, on the right, and below a frame fitted to its buffer.  Set
this to avoid obscuring other desktop objects like the taskbar.
The default is nil for each side, which means to not add margins.

The value specified here can be overridden for a specific frame
by that frame's `fit-frame-to-buffer-margins' parameter, if
present.  See also `fit-frame-to-buffer-sizes'."
  :version "24.4"
  :type '(list
	  (choice
	   :tag "Left"
	   :value nil
	   :format "%[LeftMargin%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Pixels" :size 5))
	  (choice
	   :tag "Top"
	   :value nil
	   :format "%[TopMargin%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Pixels" :size 5))
	  (choice
	   :tag "Right"
	   :value nil
	   :format "%[RightMargin%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Pixels" :size 5))
	  (choice
	   :tag "Bottom"
	   :value nil
	   :format "%[BottomMargin%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Pixels" :size 5)))
  :group 'help)

(defcustom fit-frame-to-buffer-sizes '(nil nil nil nil)
  "Size boundaries of frame for `fit-frame-to-buffer'.
This list specifies the total maximum and minimum lines and
maximum and minimum columns of the root window of any frame that
shall be fit to its buffer.  If any of these values is non-nil,
it overrides the corresponding argument of `fit-frame-to-buffer'.

On window systems where the menubar can wrap, fitting a frame to
its buffer may swallow the last line(s).  Specifying an
appropriate minimum width value here can avoid such wrapping.

See also `fit-frame-to-buffer-margins'."
  :version "24.4"
  :type '(list
	  (choice
	   :tag "Maximum Height"
	   :value nil
	   :format "%[MaxHeight%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Lines" :size 5))
	  (choice
	   :tag "Minimum Height"
	   :value nil
	   :format "%[MinHeight%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Lines" :size 5))
	  (choice
	   :tag "Maximum Width"
	   :value nil
	   :format "%[MaxWidth%] %v  "
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Columns" :size 5))
	  (choice
	   :tag "Minimum Width"
	   :value nil
	   :format "%[MinWidth%] %v\n"
	   (const :tag "None" :format "%t" nil)
	   (integer :tag "Columns" :size 5)))
  :group 'help)

(declare-function x-display-pixel-height "xfns.c" (&optional terminal))

(defun window--sanitize-margin (margin left right)
  "Return MARGIN if it's a number between LEFT and RIGHT.
Return 0 otherwise."
  (if (and (numberp margin)
           (<= left (- right margin)) (<= margin right))
      margin
    0))

(declare-function tool-bar-height "xdisp.c" (&optional frame pixelwise))

(defun fit-mini-frame-to-buffer (&optional frame)
  "Adjust size of minibuffer FRAME to display its contents.
FRAME should be a minibuffer-only frame and defaults to the
selected one.  Unlike `fit-frame-to-buffer' FRAME will fit to the
contents of its buffer with any leading or trailing empty lines
included."
  (fit-frame-to-buffer-1 frame))

(defun fit-frame-to-buffer (&optional frame max-height min-height max-width min-width only)
  "Adjust size of FRAME to display the contents of its buffer exactly.
FRAME can be any live frame and defaults to the selected one.
Fit only if FRAME's root window is live.

MAX-HEIGHT, MIN-HEIGHT, MAX-WIDTH and MIN-WIDTH specify bounds on
the new total size of FRAME's root window.  MIN-HEIGHT and
MIN-WIDTH default to the values of `window-min-height' and
`window-min-width' respectively.  These arguments are specified
in the canonical character width and height of FRAME.

If the optional argument ONLY is `vertically', resize the frame
vertically only.  If ONLY is `horizontally', resize the frame
horizontally only.

The new position and size of FRAME can be additionally determined
by customizing the options `fit-frame-to-buffer-sizes' and
`fit-frame-to-buffer-margins' or setting the corresponding
parameters of FRAME.

Any leading or trailing empty lines of the buffer content are not
considered."
  (interactive)
  (fit-frame-to-buffer-1 frame max-height min-height max-width min-width only t t))

(defun fit-frame-to-buffer-1 (&optional frame max-height min-height max-width min-width only from to)
  "Helper function for `fit-frame-to-buffer'.
FROM and TO are the buffer positions to determine the size to fit
to, see `window-text-pixel-size'.  The remaining arguments are as
for `fit-frame-to-buffer'."
  (unless (fboundp 'display-monitor-attributes-list)
    (user-error "Cannot resize frame in non-graphic Emacs"))
  (setq frame (window-normalize-frame frame))
  (when (window-live-p (frame-root-window frame))
    (let* ((char-width (frame-char-width frame))
           (char-height (frame-char-height frame))
           ;; WINDOW is FRAME's root window.
           (window (frame-root-window frame))
           (line-height (window-default-line-height window))
           (parent (frame-parent frame))
           (monitor-attributes
            (unless parent
              (frame-monitor-attributes frame)))
           ;; FRAME'S parent or display sizes.  Used in connection
           ;; with margins.
           (geometry
            (unless parent
              (cdr (assq 'geometry monitor-attributes))))
           (parent-or-display-width
            (if parent
                (frame-native-width parent)
              (nth 2 geometry)))
           (parent-or-display-height
            (if parent
                (frame-native-height parent)
              (nth 3 geometry)))
           ;; FRAME's parent or workarea sizes.  Used when no margins
           ;; are specified.
           (parent-or-workarea
            (if parent
                `(0 0 ,parent-or-display-width ,parent-or-display-height)
              (cdr (assq 'workarea monitor-attributes))))
           ;; The outer size of FRAME.  Needed to calculate the
           ;; margins around the root window's body that have to
           ;; remain untouched by fitting.
           (outer-edges (frame-edges frame 'outer-edges))
           (outer-width (if outer-edges
                            (- (nth 2 outer-edges) (nth 0 outer-edges))
                          ;; A poor guess.
                          (frame-pixel-width frame)))
           (outer-height (if outer-edges
                             (- (nth 3 outer-edges) (nth 1 outer-edges))
                           ;; Another poor guess.
                           (frame-pixel-height frame)))
           ;; The text size of FRAME.  Needed to specify FRAME's
           ;; text size after the root window's body's new sizes have
           ;; been calculated.
           (text-width (frame-text-width frame))
           (text-height (frame-text-height frame))
           ;; WINDOW's body size.
           (body-width (window-body-width window t))
           (body-height (window-body-height window t))
           ;; The difference between FRAME's outer size and WINDOW's
           ;; body size.
           (outer-minus-body-width (- outer-width body-width))
           (outer-minus-body-height (- outer-height body-height))
           ;; The difference between FRAME's text size and WINDOW's
           ;; body size (these values "should" be positive).
           (text-minus-body-width (- text-width body-width))
           (text-minus-body-height (- text-height body-height))
           ;; The current position of FRAME.
           (position (frame-position frame))
           (left (car position))
           (top (cdr position))
           ;; The margins specified for FRAME.  These represent pixel
           ;; offsets from the left, top, right and bottom edge of the
           ;; display or FRAME's parent's native rectangle and have to
           ;; take care of the display's taskbar and other obstacles.
           ;; If they are unspecified, constrain the resulting frame
           ;; to its workarea or the parent frame's native rectangle.
           (margins (or (frame-parameter frame 'fit-frame-to-buffer-margins)
                        fit-frame-to-buffer-margins))
           ;; Convert margins into pixel offsets from the left-top
           ;; corner of FRAME's display or parent.
           (left-margin (if (nth 0 margins)
                            (window--sanitize-margin
                             (nth 0 margins) 0 parent-or-display-width)
                          (nth 0 parent-or-workarea)))
           (top-margin (if (nth 1 margins)
                           (window--sanitize-margin
                            (nth 1 margins) 0 parent-or-display-height)
                         (nth 1 parent-or-workarea)))
           (right-margin (if (nth 2 margins)
                             (- parent-or-display-width
                                (window--sanitize-margin
                                 (nth 2 margins) left-margin
                                 parent-or-display-width))
                           (+ (nth 0 parent-or-workarea)
                              (nth 2 parent-or-workarea))))
           (bottom-margin (if (nth 3 margins)
                              (- parent-or-display-height
                                 (window--sanitize-margin
                                  (nth 3 margins) top-margin
                                  parent-or-display-height))
                            (+ (nth 1 parent-or-workarea)
                               (nth 3 parent-or-workarea))))
           ;; Minimum and maximum sizes specified for FRAME.
           (sizes (or (frame-parameter frame 'fit-frame-to-buffer-sizes)
                      fit-frame-to-buffer-sizes))
           ;; Calculate the minimum and maximum pixel sizes of FRAME
           ;; from the values provided by the MAX-HEIGHT, MIN-HEIGHT,
           ;; MAX-WIDTH and MIN-WIDTH arguments or, if these are nil,
           ;; from those provided by `fit-frame-to-buffer-sizes'.
           (max-height
            (min
             (cond
              ((numberp max-height) (* max-height line-height))
              ((numberp (nth 0 sizes)) (* (nth 0 sizes) line-height))
              (t parent-or-display-height))
             ;; The following is the maximum height that fits into the
             ;; top and bottom margins.
             (max (- bottom-margin top-margin outer-minus-body-height))))
           (min-height
            (cond
             ((numberp min-height) (* min-height line-height))
             ((numberp (nth 1 sizes)) (* (nth 1 sizes) line-height))
             (t (window-min-size window nil nil t))))
           (max-width
            (min
             (cond
              ((numberp max-width) (* max-width char-width))
              ((numberp (nth 2 sizes)) (* (nth 2 sizes) char-width))
              (t parent-or-display-width))
             ;; The following is the maximum width that fits into the
             ;; left and right margins.
             (max (- right-margin left-margin outer-minus-body-width))))
           (min-width
            (cond
             ((numberp min-width) (* min-width char-width))
             ((numberp (nth 3 sizes)) (nth 3 sizes))
             (t (window-min-size window t nil t))))
           ;; Note: Currently, for a new frame the sizes of the header
           ;; and mode line may be estimated incorrectly
           (size
            (window-text-pixel-size window from to max-width max-height))
           (width (max (car size) min-width))
           (height (max (cdr size) min-height)))
      ;; Don't change height or width when the window's size is fixed
      ;; in either direction or ONLY forbids it.
      (cond
       ((or (eq window-size-fixed 'width) (eq only 'vertically))
        (setq width nil))
       ((or (eq window-size-fixed 'height) (eq only 'horizontally))
        (setq height nil)))
      ;; Fit width to constraints.
      (when width
        (unless frame-resize-pixelwise
          ;; Round to character sizes.
          (setq width (* (/ (+ width char-width -1) char-width)
                         char-width)))
        ;; The new outer width (in pixels).
        (setq outer-width (+ width outer-minus-body-width))
        ;; Maybe move FRAME to preserve margins.
        (let ((right (+ left outer-width)))
          (cond
           ((> right right-margin)
            ;; Move frame to left.
            (setq left (max left-margin (- left (- right right-margin)))))
           ((< left left-margin)
            ;; Move frame to right.
            (setq left left-margin)))))
      ;; Fit height to constraints.
      (when height
        (unless frame-resize-pixelwise
          (setq height (* (/ (+ height char-height -1) char-height)
                          char-height)))
        ;; The new outer height.
        (setq outer-height (+ height outer-minus-body-height))
        ;; Preserve margins.
        (let ((bottom (+ top outer-height)))
          (cond
           ((> bottom bottom-margin)
            ;; Move frame up.
            (setq top (max top-margin (- top (- bottom bottom-margin)))))
           ((< top top-margin)
            ;; Move frame down.
            (setq top top-margin)))))
      ;; Apply our changes.
      (setq text-width
            (if width
                (+ width text-minus-body-width)
              (frame-text-width frame)))
      (setq text-height
            (if height
                (+ height text-minus-body-height)
              (frame-text-height frame)))
      (modify-frame-parameters
       frame `((left . ,left) (top . ,top)
               (width . (text-pixels . ,text-width))
               (height . (text-pixels . ,text-height)))))))

(defun fit-window-to-buffer (&optional window max-height min-height max-width min-width preserve-size)
  "Adjust size of WINDOW to display its buffer's contents exactly.
WINDOW must be a live window and defaults to the selected one.

If WINDOW is part of a vertical combination, adjust WINDOW's
height.  The new height is calculated from the actual height of
the accessible portion of its buffer.  The optional argument
MAX-HEIGHT specifies a maximum height and defaults to the height
of WINDOW's frame.  The optional argument MIN-HEIGHT specifies a
minimum height and defaults to `window-min-height'.  Both
MAX-HEIGHT and MIN-HEIGHT are specified in lines and include mode
and header line and a bottom divider, if any.

If WINDOW is part of a horizontal combination and the value of
the option `fit-window-to-buffer-horizontally' is non-nil, adjust
WINDOW's width.  The new width of WINDOW is calculated from the
maximum length of its buffer's lines that follow the current
start position of WINDOW.  The optional argument MAX-WIDTH
specifies a maximum width and defaults to the width of WINDOW's
frame.  The optional argument MIN-WIDTH specifies a minimum width
and defaults to `window-min-width'.  Both MAX-WIDTH and MIN-WIDTH
are specified in columns and include fringes, margins, a
scrollbar and a vertical divider, if any.

Optional argument PRESERVE-SIZE non-nil means to preserve the
size of WINDOW (see `window-preserve-size').

Fit pixelwise if the option `window-resize-pixelwise' is non-nil.
If WINDOW is its frame's root window and the option
`fit-frame-to-buffer' is non-nil, call `fit-frame-to-buffer' to
adjust the frame's size.

Note that even if this function makes WINDOW large enough to show
_all_ parts of its buffer you might not see the first part when
WINDOW was scrolled.  If WINDOW is resized horizontally, you will
not see the top of its buffer unless WINDOW starts at its minimum
accessible position."
  (interactive)
  (setq window (window-normalize-window window t))
  (if (eq window (frame-root-window window))
      (when fit-frame-to-buffer
	;; Fit WINDOW's frame to buffer.
	(fit-frame-to-buffer
	 (window-frame window)
	 max-height min-height max-width min-width
	 (and (memq fit-frame-to-buffer '(vertically horizontally))
	      fit-frame-to-buffer)))
    (let* ((pixelwise window-resize-pixelwise)
           (frame (window-frame window))
           (char-height (frame-char-height frame)))
      (cond
       ;; If WINDOW is vertically combined, try to resize it
       ;; vertically.
       ((and (not (eq fit-window-to-buffer-horizontally 'only))
	     (not (window-size-fixed-p window 'preserved))
	     (window-combined-p window))
        (let* ((line-height (window-default-line-height window))
	       (total-height (window-size window nil pixelwise))
               (min-height
	        ;; Sanitize MIN-HEIGHT.
	        (if (numberp min-height)
	            ;; Can't get smaller than `window-safe-min-height'.
	            (max (if pixelwise
			     (* line-height min-height)
		           min-height)
		         (if pixelwise
			     (window-safe-min-pixel-height window)
		           window-safe-min-height))
	          ;; Preserve header and mode line if present.
	          (max (if pixelwise
		           (* line-height window-min-height)
		         window-min-height)
		       (window-min-size window nil window pixelwise))))
	       (max-height
	        ;; Sanitize MAX-HEIGHT.
	        (if (numberp max-height)
	            (min
		     (+ total-height
		        (window-max-delta
		         window nil window nil t nil pixelwise))
		     (if pixelwise
		         (* line-height max-height)
		       (/ (* line-height max-height) line-height)))
	          (+ total-height (window-max-delta
			           window nil window nil t nil pixelwise))))
	       (height (+ (cdr (window-text-pixel-size
			        window nil t nil (frame-pixel-height frame) t))
		          (window-scroll-bar-height window)
		          (window-bottom-divider-width window))))
	  ;; Vertically we always want to fit the entire buffer.
	  ;; WINDOW'S height can't get larger than its frame's pixel
	  ;; height.  Its width remains fixed.
	  ;; Round height.
	  (unless pixelwise
	    (setq height (/ (+ height char-height -1) char-height)))
          (setq height (max min-height (min max-height height)))
	  (unless (= height total-height)
	    (window-preserve-size window)
	    (window-resize-no-error
	     window (- height total-height) nil window pixelwise)
	    (when preserve-size
	      (window-preserve-size window nil t)))))
       ;; If WINDOW is horizontally combined, try to resize it
       ;; horizontally.
       ((and fit-window-to-buffer-horizontally
	     (not (window-size-fixed-p window t 'preserved))
	     (window-combined-p window t))
	(let* ((char-width (frame-char-width frame))
               (total-width (window-size window t pixelwise))
	       (min-width
		;; Sanitize MIN-WIDTH.
		(if (numberp min-width)
		    ;; Can't get smaller than `window-safe-min-width'.
		    (max (if pixelwise
			     (* char-width min-width)
			   min-width)
			 (if pixelwise
			     (window-safe-min-pixel-width window)
			   window-safe-min-width))
		  ;; Preserve fringes, margins, scrollbars if present.
		  (max (if pixelwise
			   (* char-width window-min-width)
			 window-min-width)
		       (window-min-size window nil window pixelwise))))
	       (max-width
		;; Sanitize MAX-WIDTH.
		(if (numberp max-width)
		    (min (+ total-width
			    (window-max-delta
			     window t window nil t nil pixelwise))
			 (if pixelwise
			     (* char-width max-width)
			   max-width))
		  (+ total-width (window-max-delta
				  window t window nil t nil pixelwise))))
	       ;; When fitting horizontally, assume that WINDOW's
	       ;; start position remains unaltered.  WINDOW can't get
	       ;; wider than its frame's pixel width, its height
	       ;; remains unaltered.
	       (width (+ (car (window-text-pixel-size
			       window (window-start window) nil
			       (frame-pixel-width (window-frame window))
			       ;; Add one line-height to assure that
			       ;; we're on the safe side.  This
			       ;; overshoots when the first line below
			       ;; the bottom is wider than the window.
			       (* (window-body-height window pixelwise)
				  (if pixelwise 1 char-height))))
                         (- total-width
                            (window-body-width window pixelwise)))))
	  (unless pixelwise
	    (setq width (/ (+ width char-width -1) char-width)))
          (setq width (max min-width (min max-width width)))
	  (unless (= width total-width)
	    (window-preserve-size window t)
	    (window-resize-no-error
             window (- width total-width) t window pixelwise)
	    (when preserve-size
	      (window-preserve-size window t t)))))))))

(defun window-safely-shrinkable-p (&optional window)
  "Return t if WINDOW can be shrunk without shrinking other windows.
WINDOW defaults to the selected window."
  (with-selected-window (or window (selected-window))
    (let ((edges (window-edges)))
      (or (= (nth 2 edges) (nth 2 (window-edges (previous-window))))
	  (= (nth 0 edges) (nth 0 (window-edges (next-window))))))))

(defun shrink-window-if-larger-than-buffer (&optional window)
  "Shrink height of WINDOW if its buffer doesn't need so many lines.
More precisely, shrink WINDOW vertically to be as small as
possible, while still showing the full contents of its buffer.
WINDOW must be a live window and defaults to the selected one.

Do not shrink WINDOW to less than `window-min-height' lines.  Do
nothing if the buffer contains more lines than the present window
height, or if some of the window's contents are scrolled out of
view, or if shrinking this window would also shrink another
window, or if the window is the only window of its frame.

Return non-nil if the window was shrunk, nil otherwise."
  (interactive)
  (setq window (window-normalize-window window t))
  ;; Make sure that WINDOW is vertically combined and `point-min' is
  ;; visible (for whatever reason that's needed).  The remaining issues
  ;; should be taken care of by `fit-window-to-buffer'.
  (when (and (window-combined-p window)
	     (pos-visible-in-window-p (point-min) window))
    (fit-window-to-buffer window (window-total-height window))))

(defun window-largest-empty-rectangle--maximums-1 (quad maximums)
  "Support function for `window-largest-empty-rectangle'."
  (cond
   ((null maximums)
    (list quad))
   ((> (car quad) (caar maximums))
    (cons quad maximums))
   (t
    (cons (car maximums)
	  (window-largest-empty-rectangle--maximums-1 quad (cdr maximums))))))

(defun window-largest-empty-rectangle--maximums (quad maximums count)
  "Support function for `window-largest-empty-rectangle'."
  (setq maximums (window-largest-empty-rectangle--maximums-1 quad maximums))
  (if (> (length maximums) count)
      (nbutlast maximums)
    maximums))

(defun window-largest-empty-rectangle--disjoint-maximums (maximums count)
  "Support function for `window-largest-empty-rectangle'."
  (setq maximums (sort maximums (lambda (x y) (> (car x) (car y)))))
  (let ((new-length 0)
	new-maximums)
    (while (and maximums (< new-length count))
      (let* ((maximum (car maximums))
	     (at (nth 2 maximum))
	     (to (nth 3 maximum)))
	(catch 'drop
	  (dolist (new-maximum new-maximums)
	    (let ((new-at (nth 2 new-maximum))
		  (new-to (nth 3 new-maximum)))
	      (when (if (< at new-at) (> to new-at) (< at new-to))
		;; Intersection -> drop.
		(throw 'drop nil))))
	  (setq new-maximums (cons maximum new-maximums))
	  (setq new-length (1+ new-length)))
	(setq maximums (cdr maximums))))

    (nreverse new-maximums)))

(defun window-largest-empty-rectangle (&optional window count min-width min-height positions left)
  "Return dimensions of largest empty rectangle in WINDOW.
WINDOW must be a live window and defaults to the selected one.

The return value is a triple of the width and the start and end
Y-coordinates of the largest rectangle that can be inscribed into
the empty space (the space not displaying any text) of WINDOW's
text area.  The return value is nil if the current glyph matrix
of WINDOW is not up-to-date.

Optional argument COUNT, if non-nil, specifies the maximum number
of rectangles to return.  This means that the return value is a
list of triples specifying rectangles with the largest rectangle
first.  COUNT can be also a cons cell whose car specifies the
number of rectangles to return and whose cdr, if non-nil, states
that all rectangles returned must be disjoint.

Note that the right edge of any rectangle returned by this
function is the right edge of WINDOW (the left edge if its buffer
displays RTL text).

Optional arguments MIN-WIDTH and MIN-HEIGHT, if non-nil, specify
the minimum width and height of any rectangle returned.

Optional argument POSITIONS, if non-nil, is a cons cell whose car
specifies the uppermost and whose cdr specifies the lowermost
pixel position that must be covered by any rectangle returned.
Note that positions are counted from the start of the text area
of WINDOW.

Optional argument LEFT, if non-nil, means to return values suitable for
buffers displaying right to left text."
  ;; Process lines as returned by ‘window-lines-pixel-dimensions’.
  ;; STACK is a stack that contains rows that have yet to be processed.
  (let* ((window (window-normalize-window window t))
	 (disjoint (and (consp count) (cdr count)))
	 (count (or (and (numberp count) count)
		    (and (consp count) (numberp (car count)) (car count))))
	 (rows (window-lines-pixel-dimensions window nil nil t t left))
	 (rows-at 0)
	 (max-size 0)
	 row stack stack-at stack-to
	 top top-width top-at top-to top-size
	 max-width max-at max-to maximums)
    ;; ROWS-AT is the position where the first element of ROWS starts.
    ;; STACK-AT is the position where the first element of STACK starts.
    (while rows
      (setq row (car rows))
      (if (or (not stack) (>= (car row) (caar stack)))
	  (progn
	    (unless stack
	      (setq stack-at rows-at))
	    (setq stack (cons row stack))
	    ;; Set ROWS-AT to where the first element of ROWS ends
	    ;; which, after popping ROW, makes it the start position of
	    ;; the next ROW.
	    (setq rows-at (cdr row))
	    (setq rows (cdr rows)))
	(setq top (car stack))
	(setq stack (cdr stack))
	(setq top-width (car top))
	(setq top-at (if stack (cdar stack) stack-at))
	(setq top-to (cdr top))
	(setq top-size (* top-width (- top-to top-at)))
	(unless (or (and min-width (< top-width min-width))
		    (and min-height (< (- top-to top-at) min-height))
		    (and positions
			 (or (> top-at (car positions))
			     (< top-to (cdr positions)))))
	  (if count
	      (if disjoint
		  (setq maximums (cons (list top-size top-width top-at top-to)
				       maximums))
		(setq maximums (window-largest-empty-rectangle--maximums
				(list top-size top-width top-at top-to)
				maximums count)))
	    (when (> top-size max-size)
	      (setq max-size top-size)
	      (setq max-width top-width)
	      (setq max-at top-at)
	      (setq max-to top-to))))
	(if (and stack (> (caar stack) (car row)))
	    ;; Have new top element of stack include old top.
	    (setq stack (cons (cons (caar stack) (cdr top)) (cdr stack)))
	  ;; Move rows-at backwards to top-at.
	  (setq rows-at top-at))))

    (when stack
      ;; STACK-TO is the position where the stack ends.
      (setq stack-to (cdar stack))
      (while stack
	(setq top (car stack))
	(setq stack (cdr stack))
	(setq top-width (car top))
	(setq top-at (if stack (cdar stack) stack-at))
	(setq top-size (* top-width (- stack-to top-at)))
	(unless (or (and min-width (< top-width min-width))
		    (and min-height (< (- stack-to top-at) min-height))
		    (and positions
			 (or (> top-at (car positions))
			     (< stack-to (cdr positions)))))
	  (if count
	      (if disjoint
		  (setq maximums (cons (list top-size top-width top-at stack-to)
				       maximums))
		(setq maximums (window-largest-empty-rectangle--maximums
				(list top-size top-width top-at stack-to)
				maximums count)))
	    (when (> top-size max-size)
	      (setq max-size top-size)
	      (setq max-width top-width)
	      (setq max-at top-at)
	      (setq max-to stack-to))))))

    (cond
     (maximums
      (if disjoint
	  (window-largest-empty-rectangle--disjoint-maximums maximums count)
	maximums))
     ((> max-size 0)
      (list max-width max-at max-to)))))
\f
(defun kill-buffer-and-window ()
  "Kill the current buffer and delete the selected window."
  (interactive)
  (let ((window-to-delete (selected-window))
	(buffer-to-kill (current-buffer))
	(delete-window-hook (lambda () (ignore-errors (delete-window)))))
    (unwind-protect
	(progn
	  (add-hook 'kill-buffer-hook delete-window-hook t t)
	  (if (kill-buffer (current-buffer))
	      ;; If `delete-window' failed before, we rerun it to regenerate
	      ;; the error so it can be seen in the echo area.
	      (when (eq (selected-window) window-to-delete)
		(delete-window))))
      ;; If the buffer is not dead for some reason (probably because
      ;; of a `quit' signal), remove the hook again.
      (ignore-errors
       (with-current-buffer buffer-to-kill
	 (remove-hook 'kill-buffer-hook delete-window-hook t))))))

\f
;;;
;; Groups of windows (Follow Mode).
;;
;; This section of functions extends the functionality of some window
;; manipulating commands to groups of windows cooperatively
;; displaying a buffer, typically with Follow Mode.
;;
;; The xxx-function variables are permanent locals so that their local
;; status is undone only when explicitly programmed, not when a buffer
;; is reverted or a mode function is called.

(defvar-local window-group-start-function nil)
(put 'window-group-start-function 'permanent-local t)
(defun window-group-start (&optional window)
  "Return position at which display currently starts in the group of
windows containing WINDOW.  When a grouping mode (such as Follow Mode)
is not active, this function is identical to `window-start'.

WINDOW must be a live window and defaults to the selected one.
This is updated by redisplay or by calling `set-window*-start'."
  (if (functionp window-group-start-function)
      (funcall window-group-start-function window)
    (window-start window)))

(defvar-local window-group-end-function nil)
(put 'window-group-end-function 'permanent-local t)
(defun window-group-end (&optional window update)
  "Return position at which display currently ends in the group of
windows containing WINDOW.  When a grouping mode (such as Follow Mode)
is not active, this function is identical to `window-end'.

WINDOW must be a live window and defaults to the selected one.
This is updated by redisplay, when it runs to completion.
Simply changing the buffer text or setting `window-group-start'
does not update this value.
Return nil if there is no recorded value.  (This can happen if the
last redisplay of WINDOW was preempted, and did not finish.)
If UPDATE is non-nil, compute the up-to-date position
if it isn't already recorded."
  (if (functionp window-group-end-function)
      (funcall window-group-end-function window update)
    (window-end window update)))

(defvar-local set-window-group-start-function nil)
(put 'set-window-group-start-function 'permanent-local t)
(defun set-window-group-start (window pos &optional noforce)
  "Make display in the group of windows containing WINDOW start at
position POS in WINDOW's buffer.  When a grouping mode (such as Follow
Mode) is not active, this function is identical to `set-window-start'.

WINDOW must be a live window and defaults to the selected one.  Return
POS.  Optional third arg NOFORCE non-nil inhibits next redisplay from
overriding motion of point in order to display at this exact start."
  (if (functionp set-window-group-start-function)
      (funcall set-window-group-start-function window pos noforce)
    (set-window-start window pos noforce)))

(defvar-local recenter-window-group-function nil)
(put 'recenter-window-group-function 'permanent-local t)
(defun recenter-window-group (&optional arg)
  "Center point in the group of windows containing the selected window
and maybe redisplay frame.  When a grouping mode (such as Follow Mode)
is not active, this function is identical to `recenter'.

With a numeric prefix argument ARG, recenter putting point on screen line ARG
relative to the first window in the selected window group.  If ARG is
negative, it counts up from the bottom of the last window in the
group.  (ARG should be less than the total height of the window group.)

If ARG is omitted or nil, then recenter with point on the middle line of
the selected window group; if the variable `recenter-redisplay' is
non-nil, also erase the entire frame and redraw it (when
`auto-resize-tool-bars' is set to `grow-only', this resets the
tool-bar's height to the minimum height needed); if
`recenter-redisplay' has the special value `tty', then only tty frames
are redrawn.

Just C-u as prefix means put point in the center of the window
and redisplay normally--don't erase and redraw the frame."
  (if (functionp recenter-window-group-function)
      (funcall recenter-window-group-function arg)
    (recenter arg)))

(defvar-local pos-visible-in-window-group-p-function nil)
(put 'pos-visible-in-window-group-p-function 'permanent-local t)
(defun pos-visible-in-window-group-p (&optional pos window partially)
  "Return non-nil if position POS is currently on the frame in the
window group containing WINDOW.  When a grouping mode (such as Follow
Mode) is not active, this function is identical to
`pos-visible-in-window-p'.

WINDOW must be a live window and defaults to the selected one.

Return nil if that position is scrolled vertically out of view.  If a
character is only partially visible, nil is returned, unless the
optional argument PARTIALLY is non-nil.  If POS is only out of view
because of horizontal scrolling, return non-nil.  If POS is t, it
specifies the position of the last visible glyph in the window group.
POS defaults to point in WINDOW; WINDOW defaults to the selected
window.

If POS is visible, return t if PARTIALLY is nil; if PARTIALLY is non-nil,
the return value is a list of 2 or 6 elements (X Y [RTOP RBOT ROWH VPOS]),
where X and Y are the pixel coordinates relative to the top left corner
of the window.  The remaining elements are omitted if the character after
POS is fully visible; otherwise, RTOP and RBOT are the number of pixels
off-window at the top and bottom of the screen line (\"row\") containing
POS, ROWH is the visible height of that row, and VPOS is the row number
\(zero-based)."
  (if (functionp pos-visible-in-window-group-p-function)
      (funcall pos-visible-in-window-group-p-function pos window partially)
    (pos-visible-in-window-p pos window partially)))

(defvar-local selected-window-group-function nil)
(put 'selected-window-group-function 'permanent-local t)
(defun selected-window-group ()
  "Return the list of windows in the group containing the selected window.
When a grouping mode (such as Follow Mode) is not active, the
result is a list containing only the selected window."
  (if (functionp selected-window-group-function)
      (funcall selected-window-group-function)
    (list (selected-window))))

(defvar-local move-to-window-group-line-function nil)
(put 'move-to-window-group-line-function 'permanent-local t)
(defun move-to-window-group-line (arg)
  "Position point relative to the current group of windows.
When a grouping mode (such as Follow Mode) is not active, this
function is identical to `move-to-window-line'.

ARG nil means position point at center of the window group.
Else, ARG specifies the vertical position within the window
group; zero means top of first window in the group, negative
means relative to the bottom of the last window in the group."
  (if (functionp move-to-window-group-line-function)
      (funcall move-to-window-group-line-function arg)
    (move-to-window-line arg)))

\f
(defvar recenter-last-op nil
  "Indicates the last recenter operation performed.
Possible values: `top', `middle', `bottom', integer or float numbers.
It can also be nil, which means the first value in `recenter-positions'.")

(defcustom recenter-positions '(middle top bottom)
  "Cycling order for `recenter-top-bottom'.
A list of elements with possible values `top', `middle', `bottom',
integer or float numbers that define the cycling order for
the command `recenter-top-bottom'.

Top and bottom destinations are `scroll-margin' lines from the true
window top and bottom.  Middle redraws the frame and centers point
vertically within the window.  Integer number moves current line to
the specified absolute window-line.  Float number between 0.0 and 1.0
means the percentage of the screen space from the top.  The default
cycling order is middle -> top -> bottom."
  :type '(repeat (choice
		  (const :tag "Top" top)
		  (const :tag "Middle" middle)
		  (const :tag "Bottom" bottom)
		  (integer :tag "Line number")
		  (float :tag "Percentage")))
  :version "23.2"
  :group 'windows)

(defun recenter-top-bottom (&optional arg)
  "Scroll the window so that current line is in the middle of the window.
Successive invocations scroll the window in a cyclical order to put
the current line at certain places within the window, as determined by
`recenter-positions'.  By default, the second invocation puts the
current line at the top-most window line, the third invocation puts it
on the bottom-most window line, and then the order is reused in a
cyclical manner.

With numeric prefix ARG, move current line ARG lines below the window top.
With plain \\[universal-argument], move current line to window center."
  (interactive "P")
  (cond
   (arg (recenter arg t))                 ; Always respect ARG.
   (t
    (setq recenter-last-op
	  (if (eq this-command last-command)
	      (car (or (cdr (member recenter-last-op recenter-positions))
		       recenter-positions))
	    (car recenter-positions)))
    (let ((this-scroll-margin
	   (min (max 0 scroll-margin)
		(truncate (/ (window-body-height) 4.0)))))
      (cond ((eq recenter-last-op 'middle)
	     (recenter nil t))
	    ((eq recenter-last-op 'top)
	     (recenter this-scroll-margin t))
	    ((eq recenter-last-op 'bottom)
	     (recenter (- -1 this-scroll-margin) t))
	    ((integerp recenter-last-op)
	     (recenter recenter-last-op t))
	    ((floatp recenter-last-op)
	     (recenter (round (* recenter-last-op (window-height))) t)))))))

(define-key global-map [?\C-l] 'recenter-top-bottom)

(defun recenter-other-window (&optional arg)
  "Call `recenter-top-bottom' in the other window.

A prefix argument is handled like `recenter':
 With numeric prefix ARG, move current line to window-line ARG.
 With plain `C-u', move current line to window center."
  (interactive "P")
  (with-selected-window (other-window-for-scrolling)
    (recenter-top-bottom arg)
    (pulse-momentary-highlight-one-line (point))))

(define-key global-map [?\S-\M-\C-l] 'recenter-other-window)

(defun move-to-window-line-top-bottom (&optional arg)
  "Position point relative to window.

With a prefix argument ARG, acts like `move-to-window-line'.

With no argument, positions point at center of window.
Successive calls position point at positions defined
by `recenter-positions'."
  (interactive "P")
  (cond
   (arg (move-to-window-line arg))	; Always respect ARG.
   (t
    (setq recenter-last-op
	  (if (eq this-command last-command)
	      (car (or (cdr (member recenter-last-op recenter-positions))
		       recenter-positions))
	    (car recenter-positions)))
    (let ((this-scroll-margin
	   (min (max 0 scroll-margin)
		(truncate (/ (window-body-height) 4.0)))))
      (cond ((eq recenter-last-op 'middle)
	     (call-interactively 'move-to-window-line))
	    ((eq recenter-last-op 'top)
	     (move-to-window-line this-scroll-margin))
	    ((eq recenter-last-op 'bottom)
	     (move-to-window-line (- -1 this-scroll-margin)))
	    ((integerp recenter-last-op)
	     (move-to-window-line recenter-last-op))
	    ((floatp recenter-last-op)
	     (move-to-window-line (round (* recenter-last-op (window-height))))))))))

(define-key global-map [?\M-r] 'move-to-window-line-top-bottom)
\f
;;; Scrolling commands.

;;; Scrolling commands which do not signal errors at top/bottom
;;; of buffer at first key-press (instead move to top/bottom
;;; of buffer).

(defcustom scroll-error-top-bottom nil
  "Move point to top/bottom of buffer before signaling a scrolling error.
A value of nil means just signal an error if no more scrolling possible.
A value of t means point moves to the beginning or the end of the buffer
\(depending on scrolling direction) when no more scrolling possible.
When point is already on that position, then signal an error."
  :type 'boolean
  :group 'windows
  :version "24.1")

(defun scroll-up-command (&optional arg)
  "Scroll text of selected window upward ARG lines; or near full screen if no ARG.
If `scroll-error-top-bottom' is non-nil and `scroll-up' cannot
scroll window further, move cursor to the bottom line.
When point is already on that position, then signal an error.
A near full screen is `next-screen-context-lines' less than a full screen.
Negative ARG means scroll downward.
If ARG is the atom `-', scroll downward by nearly full screen."
  (interactive "^P")
  (cond
   ((null scroll-error-top-bottom)
    (scroll-up arg))
   ((eq arg '-)
    (scroll-down-command nil))
   ((< (prefix-numeric-value arg) 0)
    (scroll-down-command (- (prefix-numeric-value arg))))
   ((eobp)
    (scroll-up arg))			; signal error
   (t
    (condition-case nil
	(scroll-up arg)
      (end-of-buffer
       (if arg
	   ;; When scrolling by ARG lines can't be done,
	   ;; move by ARG lines instead.
	   (forward-line arg)
	 ;; When ARG is nil for full-screen scrolling,
	 ;; move to the bottom of the buffer.
	 (goto-char (point-max))))))))

(put 'scroll-up-command 'scroll-command t)

(defun scroll-down-command (&optional arg)
  "Scroll text of selected window down ARG lines; or near full screen if no ARG.
If `scroll-error-top-bottom' is non-nil and `scroll-down' cannot
scroll window further, move cursor to the top line.
When point is already on that position, then signal an error.
A near full screen is `next-screen-context-lines' less than a full screen.
Negative ARG means scroll upward.
If ARG is the atom `-', scroll upward by nearly full screen."
  (interactive "^P")
  (cond
   ((null scroll-error-top-bottom)
    (scroll-down arg))
   ((eq arg '-)
    (scroll-up-command nil))
   ((< (prefix-numeric-value arg) 0)
    (scroll-up-command (- (prefix-numeric-value arg))))
   ((bobp)
    (scroll-down arg))			; signal error
   (t
    (condition-case nil
	(scroll-down arg)
      (beginning-of-buffer
       (if arg
	   ;; When scrolling by ARG lines can't be done,
	   ;; move by ARG lines instead.
	   (forward-line (- arg))
	 ;; When ARG is nil for full-screen scrolling,
	 ;; move to the top of the buffer.
	 (goto-char (point-min))))))))

(put 'scroll-down-command 'scroll-command t)

;;; Scrolling commands which scroll a line instead of full screen.

(defun scroll-up-line (&optional arg)
  "Scroll text of selected window upward ARG lines; or one line if no ARG.
If ARG is omitted or nil, scroll upward by one line.
This is different from `scroll-up-command' that scrolls a full screen."
  (interactive "p")
  (scroll-up (or arg 1)))

(put 'scroll-up-line 'scroll-command t)

(defun scroll-down-line (&optional arg)
  "Scroll text of selected window down ARG lines; or one line if no ARG.
If ARG is omitted or nil, scroll down by one line.
This is different from `scroll-down-command' that scrolls a full screen."
  (interactive "p")
  (scroll-down (or arg 1)))

(put 'scroll-down-line 'scroll-command t)

\f
(defun beginning-of-buffer-other-window (arg)
  "Move point to the beginning of the buffer in the other window.
Leave mark at previous position.
With arg N, put point N/10 of the way from the true beginning."
  (interactive "P")
  (with-selected-window (other-window-for-scrolling)
    ;; Set point and mark in that window's buffer.
    (with-no-warnings
      (beginning-of-buffer arg))
    ;; Set point accordingly.
    (recenter '(t))))

(defun end-of-buffer-other-window (arg)
  "Move point to the end of the buffer in the other window.
Leave mark at previous position.
With arg N, put point N/10 of the way from the true end."
  (interactive "P")
  ;; See beginning-of-buffer-other-window for comments.
  (with-selected-window (other-window-for-scrolling)
    (with-no-warnings
      (end-of-buffer arg))
    (recenter '(t))))
\f
(defvar mouse-autoselect-window-timer nil
  "Timer used by delayed window autoselection.")

(defvar mouse-autoselect-window-position-1 nil
  "First mouse position recorded by delayed window autoselection.")

(defvar mouse-autoselect-window-position nil
  "Last mouse position recorded by delayed window autoselection.")

(defvar mouse-autoselect-window-window nil
  "Last window recorded by delayed window autoselection.")

(defvar mouse-autoselect-window-state nil
  "When non-nil, special state of delayed window autoselection.
Possible values are `suspend' (suspend autoselection after a menu or
scrollbar interaction) and `select' (the next invocation of
`handle-select-window' shall select the window immediately).")

(defun mouse-autoselect-window-cancel (&optional force)
  "Cancel delayed window autoselection.
Optional argument FORCE means cancel unconditionally."
  (unless (and (not force)
	       ;; Don't cancel for select-window or select-frame events
	       ;; or when the user drags a scroll bar.
	       (or (memq this-command
			 '(handle-select-window handle-switch-frame))
		   (and (eq this-command 'scroll-bar-toolkit-scroll)
			(memq (nth 4 (event-end last-input-event))
			      '(handle end-scroll)))))
    (setq mouse-autoselect-window-state nil)
    (setq mouse-autoselect-window-position-1 nil)
    (when (timerp mouse-autoselect-window-timer)
      (cancel-timer mouse-autoselect-window-timer))
    (remove-hook 'pre-command-hook 'mouse-autoselect-window-cancel)))

(defun mouse-autoselect-window-start (mouse-position &optional window suspend)
  "Start delayed window autoselection.
MOUSE-POSITION is the last position where the mouse was seen as returned
by `mouse-position'.  Optional argument WINDOW non-nil denotes the
window where the mouse was seen.  Optional argument SUSPEND non-nil
means suspend autoselection."
  ;; Record values for MOUSE-POSITION, WINDOW, and SUSPEND.
  (setq mouse-autoselect-window-position mouse-position)
  (when window (setq mouse-autoselect-window-window window))
  (setq mouse-autoselect-window-state (when suspend 'suspend))
  ;; Install timer which runs `mouse-autoselect-window-select' after
  ;; `mouse-autoselect-window' seconds.
  (setq mouse-autoselect-window-timer
	(run-at-time
	 (abs mouse-autoselect-window) nil 'mouse-autoselect-window-select)))

(defun mouse-autoselect-window-select ()
  "Select window with delayed window autoselection.
If the mouse position has stabilized in a non-selected window, select
that window.  The minibuffer window is selected only if the minibuffer
is active.  This function is run by `mouse-autoselect-window-timer'."
  (let* ((mouse-position (mouse-position))
         (mouse-x (and (numberp (cadr mouse-position))
                       (cadr mouse-position)))
         (mouse-y (and (numberp (cddr mouse-position))
                       (cddr mouse-position)))
         (frame (and mouse-x mouse-y (car mouse-position)))
         (window (and frame (window-at mouse-x mouse-y frame))))
    (cond
      ((or (and (fboundp 'menu-or-popup-active-p) (menu-or-popup-active-p))
	   (and window
		(let ((coords (coordinates-in-window-p
			       (cdr mouse-position) window)))
		  (and (not (consp coords))
		       (not (memq coords '(left-margin right-margin)))))))
       ;; A menu / popup dialog is active or the mouse is not on the
       ;; text region of WINDOW: Suspend autoselection temporarily.
       (mouse-autoselect-window-start mouse-position nil t))
      ((or (eq mouse-autoselect-window-state 'suspend)
          ;; When the mouse is at its first recorded position, restart
          ;; delayed autoselection.  This works around a scenario with
          ;; two two-window frames with identical dimensions: select the
          ;; first window of the first frame, switch to the second
          ;; frame, move the mouse to its second window, minimize the
          ;; second frame.  Now the second window of the first frame
          ;; gets selected although the mouse never really "moved" into
          ;; that window.
          (and (numberp mouse-autoselect-window)
               (equal (mouse-position) mouse-autoselect-window-position-1)))
      ;; Delayed autoselection was temporarily suspended, reenable it.
      (mouse-autoselect-window-start mouse-position))
     ((and window
           (or (not (numberp mouse-autoselect-window))
               (and (>= mouse-autoselect-window 0)
                    ;; If `mouse-autoselect-window' is non-negative,
                    ;; select window if it's the same as before.
                    (eq window mouse-autoselect-window-window))
               ;; Otherwise select window iff the mouse is at the same
               ;; position as before.  Observe that the first test
               ;; after starting autoselection usually fails since the
               ;; value of `mouse-autoselect-window-position' recorded
               ;; there is the position where the mouse has entered the
               ;; new window and not necessarily where the mouse has
               ;; stopped moving.
               (equal mouse-position mouse-autoselect-window-position))
           ;; The minibuffer is a candidate window if it's active.
           (or (not (window-minibuffer-p window))
               (eq window (active-minibuffer-window))))
      ;; Mouse position has stabilized in non-selected window: Cancel
      ;; delayed autoselection and try to select that window.
      (mouse-autoselect-window-cancel t)
      ;; Use `unread-command-events' in order to execute pre- and
      ;; post-command hooks and trigger idle timers.  To avoid delaying
      ;; autoselection again, set `mouse-autoselect-window-state'."
      (setq mouse-autoselect-window-state 'select)
      (setq unread-command-events
            (cons (list 'select-window (list window))
                  unread-command-events)))
     ((or (not (numberp mouse-autoselect-window))
          (equal mouse-position mouse-autoselect-window-position))
      ;; Mouse position has stabilized at
      ;; `mouse-autoselect-window-position': Cancel delayed
      ;; autoselection.
     (mouse-autoselect-window-cancel t))
    (window
     ;; Mouse position has not stabilized yet, resume delayed
     ;; autoselection.
     (mouse-autoselect-window-start mouse-position window)))))

(declare-function display-multi-frame-p "frame" (&optional display))

(defun handle-select-window (event)
  "Handle select-window events."
  (interactive "^e")
  (let* ((window (posn-window (event-start event)))
         (frame (and (window-live-p window) (window-frame window)))
         (old-frame (selected-frame)))
    (unless (or (not (window-live-p window))
		;; Don't switch when autoselection shall be delayed.
		(and (numberp mouse-autoselect-window)
		     (not (eq mouse-autoselect-window-state 'select))
		     (let ((position (mouse-position)))
		       ;; Cancel any delayed autoselection.
		       (mouse-autoselect-window-cancel t)
		       ;; Start delayed autoselection from current mouse
		       ;; position and window.
		       (setq mouse-autoselect-window-position-1 position)
		       (mouse-autoselect-window-start position window)
		       ;; Executing a command cancels delayed autoselection.
		       (add-hook
			'pre-command-hook 'mouse-autoselect-window-cancel)))
                ;; Don't switch to a `no-accept-focus' frame unless it's
                ;; already selected.
                (and (not (eq frame (selected-frame)))
                     (frame-parameter frame 'no-accept-focus))
                ;; Don't switch if window autoselection with mouse is active
                ;; and minibuffer window is selected.
                (and mouse-autoselect-window (window-minibuffer-p))
                ;; Don't switch to minibuffer window unless it's active.
                (and (window-minibuffer-p window)
                     (not (minibuffer-window-active-p window))))
      ;; Reset state of delayed autoselection.
      (setq mouse-autoselect-window-state nil)
      ;; Run `mouse-leave-buffer-hook' when autoselecting window.
      (run-hooks 'mouse-leave-buffer-hook)
      ;; Clear echo area.
      (message nil)
      ;; Select the window before giving the frame focus since otherwise
      ;; we might get two windows with an active cursor.
      (select-window window)
      (cond
       ((or (not (display-multi-frame-p))
            (not focus-follows-mouse)
            ;; Focus FRAME if it's either a child frame or an ancestor
            ;; of the frame switched from.
            (and (not (frame-parameter frame 'parent-frame))
                 (not (frame-ancestor-p frame old-frame)))))
       ((eq focus-follows-mouse 'auto-raise)
        ;; Focus and auto-raise frame.
        (x-focus-frame frame)
        ;; This doesn't seem to work when we move from a normal frame
        ;; right into the child frame of another frame - we should raise
        ;; that child frame's ancestor frame first ...
        (raise-frame frame))
       (t
        ;; Just focus frame.
        (x-focus-frame frame t))))))

(defun truncated-partial-width-window-p (&optional window)
  "Return non-nil if lines in WINDOW are specifically truncated due to its width.
WINDOW must be a live window and defaults to the selected one.
Return nil if WINDOW is not a partial-width window
 (regardless of the value of `truncate-lines').
Otherwise, consult the value of `truncate-partial-width-windows'
 for the buffer shown in WINDOW."
  (setq window (window-normalize-window window t))
  (unless (window-full-width-p window)
    (let ((t-p-w-w (buffer-local-value 'truncate-partial-width-windows
				       (window-buffer window))))
      (if (integerp t-p-w-w)
	  (< (window-width window) t-p-w-w)
        t-p-w-w))))

\f
;; Automatically inform subprocesses of changes to window size.

(defcustom window-adjust-process-window-size-function
  'window-adjust-process-window-size-smallest
  "Control how Emacs chooses inferior process window sizes.
Emacs uses this function to tell processes the space they have
available for displaying their output.  After each window
configuration change, Emacs calls the value of
`window-adjust-process-window-size-function' for each process
with a buffer being displayed in at least one window.
This function is responsible for combining the sizes of the
displayed windows and returning a cons (WIDTH . HEIGHT)
describing the width and height with which Emacs will call
`set-process-window-size' for that process.  If the function
returns nil, Emacs does not call `set-process-window-size'.

This function is called with the process buffer as the current
buffer and with two arguments: the process and a list of windows
displaying process.  Modes can make this variable buffer-local;
additionally, the `adjust-window-size-function' process property
overrides the global or buffer-local value of
`window-adjust-process-window-size-function'."
  :type '(choice
          (const :tag "Minimum area of any window"
           window-adjust-process-window-size-smallest)
          (const :tag "Maximum area of any window"
           window-adjust-process-window-size-largest)
          (const :tag "Do not adjust process window sizes" ignore)
          function)
  :group 'windows
  :version "25.1")

(defun window-adjust-process-window-size (reducer windows)
  "Adjust the window sizes of a process.
WINDOWS is a list of windows associated with that process.  REDUCER is
a two-argument function used to combine the widths and heights of
the given windows."
  (when windows
    (let ((width (window-max-chars-per-line (car windows)))
          (height (with-selected-window (car windows)
                    (floor (window-screen-lines)))))
      (dolist (window (cdr windows))
        (setf width (funcall reducer width (window-max-chars-per-line window)))
        (setf height (funcall reducer height (with-selected-window window
                                               (floor (window-screen-lines))))))
      (cons width height))))

(defun window-adjust-process-window-size-smallest (_process windows)
  "Adjust the process window size of PROCESS.
WINDOWS is a list of windows associated with PROCESS.  Choose the
smallest area available for displaying PROCESS's output."
  (window-adjust-process-window-size #'min windows))

(defun window-adjust-process-window-size-largest (_process windows)
  "Adjust the process window size of PROCESS.
WINDOWS is a list of windows associated with PROCESS.  Choose the
largest area available for displaying PROCESS's output."
  (window-adjust-process-window-size #'max windows))

(defun window--process-window-list ()
  "Return an alist mapping processes to associated windows.
A window is associated with a process if that window is
displaying that processes's buffer."
  (let ((processes (process-list))
        (process-windows nil))
    (if processes
        (walk-windows
         (lambda (window)
           (let ((buffer (window-buffer window))
                 (iter processes))
             (while (let ((process (car iter)))
                      (if (and (process-live-p process)
                               (eq buffer (process-buffer process)))
                          (let ((procwin (assq process process-windows)))
                            ;; Add this window to the list of windows
                            ;; displaying process.
                            (if procwin
                                (push window (cdr procwin))
                              (push (list process window) process-windows))
                            ;; We found our process for this window, so
                            ;; stop iterating over the process list.
                            nil)
                        (setf iter (cdr iter)))))))
         1 t))
    process-windows))

(defun window--adjust-process-windows ()
  "Update process window sizes to match the current window configuration."
  (when (fboundp 'process-list)
    (dolist (procwin (window--process-window-list))
      (let ((process (car procwin)))
        (with-demoted-errors "Error adjusting window size: %S"
          (with-current-buffer (process-buffer process)
            (let ((size (funcall
                         (or (process-get process 'adjust-window-size-function)
                             window-adjust-process-window-size-function)
                         process (cdr procwin))))
              (when size
                (set-process-window-size process (cdr size) (car size))))))))))

(add-hook 'window-configuration-change-hook 'window--adjust-process-windows)
\f
;; Some of these are in tutorial--default-keys, so update that if you
;; change these.
(define-key ctl-x-map "0" 'delete-window)
(define-key ctl-x-map "1" 'delete-other-windows)
(define-key ctl-x-map "2" 'split-window-below)
(define-key ctl-x-map "3" 'split-window-right)
(define-key ctl-x-map "o" 'other-window)
(define-key ctl-x-map "^" 'enlarge-window)
(define-key ctl-x-map "}" 'enlarge-window-horizontally)
(define-key ctl-x-map "{" 'shrink-window-horizontally)
(define-key ctl-x-map "-" 'shrink-window-if-larger-than-buffer)
(define-key ctl-x-map "+" 'balance-windows)
(define-key ctl-x-4-map "0" 'kill-buffer-and-window)
(define-key ctl-x-4-map "1" 'same-window-prefix)
(define-key ctl-x-4-map "4" 'other-window-prefix)

(defvar other-window-repeat-map
  (let ((map (make-sparse-keymap)))
    (define-key map "o" 'other-window)
    (define-key map "O" (lambda ()
                          (interactive)
                          (setq repeat-map 'other-window-repeat-map)
                          (other-window -1)))
    map)
  "Keymap to repeat other-window key sequences.  Used in `repeat-mode'.")
(put 'other-window 'repeat-map 'other-window-repeat-map)

(defvar resize-window-repeat-map
  (let ((map (make-sparse-keymap)))
    ;; Standard keys:
    (define-key map "^" 'enlarge-window)
    (define-key map "}" 'enlarge-window-horizontally)
    (define-key map "{" 'shrink-window-horizontally)
    ;; Additional keys:
    (define-key map "v" 'shrink-window)
    map)
  "Keymap to repeat window resizing commands.  Used in `repeat-mode'.")
(put 'enlarge-window 'repeat-map 'resize-window-repeat-map)
(put 'enlarge-window-horizontally 'repeat-map 'resize-window-repeat-map)
(put 'shrink-window-horizontally 'repeat-map 'resize-window-repeat-map)
(put 'shrink-window 'repeat-map 'resize-window-repeat-map)

(provide 'window)

;;; window.el ends here

debug log:

solving 33f4409fcf ...
found 33f4409fcf in https://yhetil.org/emacs/8735u94gt4.fsf@host.localdomain/
found fd1c617d6b in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 fd1c617d6be6fe32301ff6e4913e5666f759ee59	lisp/window.el

applying [1/1] https://yhetil.org/emacs/8735u94gt4.fsf@host.localdomain/
diff --git a/lisp/window.el b/lisp/window.el
index fd1c617d6b..33f4409fcf 100644

Checking patch lisp/window.el...
Applied patch lisp/window.el cleanly.

index at:
100644 33f4409fcfbb947545c3c8e6acc2ffdb6811209b	lisp/window.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.