unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
blob 00c076a18e00d9f81173c119de44faf5d15cf8fe 93153 bytes (raw)
name: etc/NEWS 	 # 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
 
GNU Emacs NEWS -- history of user-visible changes.

Copyright (C) 2017-2019 Free Software Foundation, Inc.
See the end of the file for license conditions.

Please send Emacs bug reports to 'bug-gnu-emacs@gnu.org'.
If possible, use 'M-x report-emacs-bug'.

This file is about changes in Emacs version 27.

See file HISTORY for a list of GNU Emacs versions and release dates.
See files NEWS.26, NEWS.25, ..., NEWS.18, and NEWS.1-17 for changes
in older Emacs versions.

You can narrow news to a specific version by calling 'view-emacs-news'
with a prefix argument or by typing 'C-u C-h C-n'.

Temporary note:
+++ indicates that all necessary documentation updates are complete.
    (This means all relevant manuals in doc/ AND lisp doc-strings.)
--- means no change in the manuals is needed.
When you add a new item, use the appropriate mark if you are sure it applies,

\f
* Installation Changes in Emacs 27.1

** Emacs now uses GMP, the GNU Multiple Precision library.
By default, if 'configure' does not find a suitable libgmp, it
arranges for the included mini-gmp library to be built and used.
The new 'configure' option '--without-libgmp' uses mini-gmp even if a
suitable libgmp is available.

** Emacs can now use HarfBuzz as its shaping engine.
The new configure option '--with-harfbuzz' adds support for the
HarfBuzz text shaping engine.  It is on by default; use './configure
--without-harfbuzz' to build without it.  The HarfBuzz text shaping is
available via new font backend drivers 'xfthb' and 'ftcrhb' for Xft
and Cairo drawings, respectively, and via the 'harfbuzz' backend on
MS-Windows.  The Harfbuzz text shaping is preferred to the previously
supported ones, so the font backends that use older shaping engines
(FLT on GNU and Unix systems and Uniscribe on MS-Windows) are not
enabled by default; they can be enabled via the 'font-backend' frame
parameter or via X resources.

** The new configure option '--with-json' adds support for JSON using
the Jansson library.  It is on by default; use './configure
--with-json=no' to build without Jansson support.  The new JSON
functions 'json-serialize', 'json-insert', 'json-parse-string', and
'json-parse-buffer' are typically much faster than their Lisp
counterparts from json.el.

** The configure option --with-cairo is no longer experimental.
This builds Emacs with Cairo drawing, and supports built-in printing
when Emacs is built with GTK+.

** Emacs no longer defaults to using ImageMagick to display images,
due to security and stability concerns.  To override the default, use
'configure --with-imagemagick'.

** Several configure options now accept an option-argument 'ifavailable'.
For example, './configure --with-xpm=ifavailable' now configures Emacs
to attempt to use libxpm but to continue building even if libxpm is
absent.  The other affected options are '--with-gif', '--with-gnutls',
'--with-jpeg', '--with-png', and '--with-tiff'.

** The etags program now uses the C library's regular expression matcher
when possible, and a compatible regex substitute otherwise.  This will
let developers maintain Emacs's own regex code without having to also
support other programs.  The new configure option '--without-included-regex'
forces etags to use the C library's regex matcher even if the regex
substitute ordinarily would be used to work around compatibility problems.

** Emacs has been ported to the '-fcheck-pointer-bounds' option of GCC.
This causes Emacs to check bounds of some arrays addressed by its
internal pointers, which can be helpful when debugging the Emacs
interpreter or modules that it uses.  If your platform supports it you
can enable it when configuring, e.g., './configure CFLAGS="-g3 -O2
-mmpx -fcheck-pointer-bounds"' on Intel MPX platforms.

** Emacs now normally uses a C pointer type instead of a C integer
type to implement Lisp_Object, which is the fundamental machine word
type internal to the Emacs Lisp interpreter.  This change aims to
catch typos and supports '-fcheck-pointer-bounds'.  The 'configure'
option '--enable-check-lisp-object-type' is therefore no longer as
useful and so is no longer enabled by default in developer builds,
to reduce differences between developer and production builds.

+++
** Emacs now uses a "portable dumper" instead of unexec.
This improves compatibility with memory allocation on modern systems,
and in particular better supports the Address Space Layout
Randomization (ASLR) feature, a security technique used by most modern
operating systems.

Portable dumping can be disabled at configure time via the configure
option '--with-dumping=unexec' (but we don't recommend that, unless
the portable dumping doesn't work on your system for some
reason---please report such systems to the Emacs developers as bugs).

When built with the portable dumping support (which is the default),
Emacs looks for the 'emacs.pdmp' file, generated during the build, in
its data directory at startup, and loads the dumped state from there.
The new command-line argument '--dump-file=FILE' allows to specify a
non-default '.pdmp' file to load the state from; see the node "Initial
Options" in the Emacs manual for more information.

+++
** The new configure option '--enable-checking=structs' attempts to
check that the portable dumper code has been updated to match the last
change to one of the data structures that it relies on.

+++
** The configure options '--enable-checking=conslist' and
'--enable-checking=xmallocoverrun' have been withdrawn.  The former
made Emacs irredeemably slow, and the latter made it crash.  Neither
option was useful with modern debugging tools such as AddressSanitizer.
(See etc/DEBUG for the details of using the modern replacements of the
removed configure options.)

+++
** The distribution tarball now has test cases; 'make check' runs them.
This is intended mostly to help developers.

---
** Emacs now requires GTK 2.24 and GTK 3.10 for the GTK 2 and GTK 3
builds respectively.

---
** The toolbar now shows the equivalent key binding in its tooltips.

\f
* Startup Changes in Emacs 27.1

+++
** Emacs can now be configured using an early init file.
The file is called 'early-init.el', in 'user-emacs-directory'.  It is
loaded very early in the startup process: before graphical elements
such as the tool bar are initialized, and before the package manager
is initialized.  The primary purpose is to allow customizing how the
package system is initialized given that initialization now happens
before loading the regular init file (see below).

We recommend against putting any customizations in this file that
don't need to be set up before initializing installed add-on packages,
because the early init file is read too early into the startup
process, and some important parts of the Emacs session, such as
'window-system' and other GUI features, are not yet set up, which could
make some customization fail to work.

+++
** Installed packages are now activated *before* loading the init file.
This is part of a change intended to eliminate the behavior of
package.el inserting a call to 'package-initialize' into the init
file, which was previously done when Emacs was started.  As a result
of this change, it is no longer necessary to call 'package-initialize'
in your init file.

However, if your init file changes the values of 'package-load-list'
or 'package-user-dir', or sets 'package-enable-at-startup' to nil then
it won't work right without some adjustment:
- You can move that code to the early init file (see above), so those
  settings apply before Emacs tries to activate the packages.
- You can use the new 'package-quickstart' so activation of packages
  does not need to pay attention to 'package-load-list' or
  'package-user-dir' any more.

---
** Emacs now notifies systemd when startup finishes or shutdown begins.
Units that are ordered after 'emacs.service' will only be started
after Emacs has finished initialization and is ready for use.
(If your Emacs is installed in a non-standard location and you copied the
emacs.service file to eg "~/.config/systemd/user/", you will need to copy
the new version of the file again.)

+++
** New option 'help-enable-completion-auto-load'.
This allows disabling the new feature introduced in Emacs 26.1 which
loads files during completion of 'C-h f' and 'C-h v' according to
'definition-prefixes'.

\f
* Changes in Emacs 27.1

** emacsclient

*** emacsclient no longer passes --eval arguments to an alternate editor.
Previously, --eval arguments were passed as file names to any
alternate editor started by --alternate-editor/-a.

+++
*** emacsclient now supports an 'EMACS_SOCKET_NAME' environment variable.
The command-line argument '--socket-name' overrides it.
(The same behavior as for the pre-existing 'EMACS_SERVER_FILE' variable.)

+++
*** Emacs and emacsclient now default to "$XDG_RUNTIME_DIR/emacs"
as the directory for client/server sockets, if Emacs is running
under an X Window System desktop that sets the 'XDG_RUNTIME_DIR'
environment variable to indicate where session sockets should go.
To get the old, less-secure behavior, you can set the
'EMACS_SOCKET_NAME' environment variable to an appropriate value.

---
*** When run by root, emacsclient no longer connects to non-root sockets.
(Instead you can use Tramp methods to run root commands in a non-root Emacs.)

---
** Control of the threshold for using the 'distant-foreground' color.
The threshold for color distance below which the 'distant-foreground'
color of the face will be used instead of the foreground color can now
be controlled via the new variable 'face-near-same-color-threshold'.
The default value is 30000, as the previously hard-coded threshold.

+++
** The function 'read-passwd' uses "*" as default character to hide passwords.

** Lexical binding is now used when evaluating interactive Elisp forms.
More specifically, lexical-binding is now used for 'M-:', '--eval', as
well as in the "*scratch*" and "*ielm*" buffers.

---
** The new option 'tooltip-resize-echo-area' avoids truncating tooltip text
on GUI frames when tooltips are displayed in the echo area.  Instead,
it resizes the echo area as needed to accommodate the full tool-tip
text.

---
** Show mode line tooltips only if the corresponding action applies.
Customize the option 'mode-line-default-help-echo' to restore the old
behavior where the tooltip text is also shown when the corresponding
action does not apply.

+++
** New hook 'server-after-make-frame-hook'.
This hook is a convenient place to perform initializations in daemon
mode which require GUI features to be available.  One example is
restoration of the previous session using the desktop.el package: put
the call to 'desktop-read' in this hook, if you want the GUI settings
to be restored, or if desktop.el needs to interact with you during
restoration of the session.

+++
** New function 'logcount' calculates an integer's Hamming weight.

+++
** New function 'libxml-available-p'.
This function returns non-nil if libxml support is both compiled in
and available at run time.  Lisp programs should use this function to
detect built-in libxml support, instead of testing for that
indirectly, e.g., by checking that functions like
'libxml-parse-html-region' return nil.

+++
** 'libxml-parse-xml-region' and 'libxml-parse-html-region' take
a parameter that's called DISCARD-COMMENTS, but it really only
discards the top-level comment.  Therefore this parameter is now
obsolete, and the new utility function 'xml-remove-comments' can be
used to remove comments before calling the libxml functions to parse
the data.

+++
** The Network Security Manager now allows more fine-grained control
of what checks to run via the 'network-security-protocol-checks'
variable.

+++
** TLS connections have their security tightened by default.
Most of the checks for outdated, believed-to-be-weak TLS algorithms
and ciphers are now switched on by default.  By default, the NSM will
flag connections using these weak algorithms and ask users whether to
allow them.  To get the old behavior back (where certificates are
checked for validity, but no warnings about weak cryptography are
issued), you can either set 'network-security-protocol-checks' to nil,
or adjust the elements in that variable to only happen on the 'high'
security level (assuming you use the 'medium' level).

+++
** Native GnuTLS connections can now use client certificates.
Previously, this support was only available when using the external
'gnutls-cli' command.  Call 'open-network-stream' with
':client-certificate t' to trigger looking up of per-server
certificates via 'auth-source'.

+++
** New function 'fill-polish-nobreak-p', to be used in 'fill-nobreak-predicate'.
It blocks line breaking after a one-letter word, also in the case when
this word is preceded by a non-space, but non-alphanumeric character.

+++
** The limit on repetitions in regexps has been raised to 2^16-1.
It was previously limited to 2^15-1.  For example, the following
regular expression was previously invalid, but is now accepted:

   x\{32768\}

---
** The German prefix and postfix input methods now support Capital sharp S.

---
** New input methods 'hawaiian-postfix' and 'hawaiian-prefix'.

---
** New input methods 'georgian-qwerty' and 'georgian-nuskhuri'.

---
** New input methods for several variants of the Sami language.
The Sami input methods include: 'norwegian-sami-prefix',
'bergsland-hasselbrink-sami-prefix', 'southern-sami-prefix',
'ume-sami-prefix', 'northern-sami-prefix', 'inari-sami-prefix',
'skolt-sami-prefix', and 'kildin-sami-prefix'.

+++
** In Japanese environments that do not specify encodings and are not
based on MS-Windows, the default encoding is now utf-8 instead of
japanese-iso-8bit.

+++
** New function 'exec-path'.
This function by default returns the value of the corresponding
variable, but can optionally return the equivalent of 'exec-path'
from a remote host.

+++
** The function 'executable-find' supports an optional argument REMOTE.
This triggers to search the program on the remote host as indicated by
'default-directory'.

+++
** New variable 'auto-save-no-message'.
When set to t, no message will be shown when auto-saving (default
value: nil).

---
** The value of 'make-cursor-line-fully-visible' can now be a function.
In addition to nil or non-nil, the value can now be a predicate
function.  Follow mode uses this to control scrolling of its windows
when the last screen line in a window is not fully visible.

+++
** New variable 'emacs-repository-branch'.
It reports the git branch from which Emacs was built.

+++
** New user option 'switch-to-buffer-obey-display-actions'.
When non-nil, 'switch-to-buffer' uses 'pop-to-buffer-same-window' that
respects display actions specified by 'display-buffer-alist' and
'display-buffer-overriding-action'.

** New 'flex' completion style
An implementation of popular "flx/fuzzy/scatter" completion which
matches strings where the pattern appears as a subsequence.  Put
simply, makes "foo" complete to both "barfoo" and "frodo".  Add 'flex'
to 'completion-styles' or 'completion-category-overrides' to use it.

** Connection-local variables

+++
*** Connection-local variables are applied by default like file-local
and directory-local variables.

+++
*** The macro 'with-connection-local-variables' has been renamed from
'with-connection-local-profiles'.  No argument PROFILES needed any longer.

---
** New variable 'next-error-verbose' controls when 'next-error' outputs
a message about the error locus.

---
** New variable 'grep-search-path' defines the directories searched for
grep hits (this used to be controlled by 'compilation-search-path').

---
** New variable 'emacs-lisp-compilation-search-path' defines the
directories searched for byte-compiler error messages (this used to
be controlled by 'compilation-search-path').

** Multicolor fonts such as "Noto Color Emoji" can be displayed on
Emacs configured with Cairo drawing and linked with cairo >= 1.16.0.

+++
** Emacs now optionally displays a fill column indicator.

This is similar to what 'fill-column-indicator' package provides, but
much faster and compatible with 'show-trailing-whitespace'.

Customize the buffer-local variables 'display-fill-column-indicator'
and 'display-fill-column-indicator-character' to activate the
indicator.

The indicator is not displayed at all in minibuffer windows and
in tooltips, as it is not useful there.

There are 2 new buffer local variables and 1 face to customize this
mode they are described in the manual "(emacs) Display".

+++
** 'progress-reporter-update' accepts a suffix string to display.

---
** New variable 'xref-file-name-display' controls the display of file
names in xref buffers.
** New variable `file-size-function' controls how file sizes are displayed

\f
* Editing Changes in Emacs 27.1

+++
** New command 'make-empty-file'.

---
** New variable 'x-wait-for-event-timeout'.
This controls how long Emacs will wait for updates to the graphical
state to take effect (making a frame visible, for example).

+++
** New user option 'electric-quote-replace-double'.
This option controls whether '"' is replaced in 'electric-quote-mode',
in addition to other quote characters.  If non-nil, ASCII double-quote
characters that quote text "like this" are replaced by double
typographic quotes, “like this”, in text modes, and in comments in
non-text modes.

---
** New user option 'flyspell-case-fold-duplications'.
This option controls whether Flyspell mode considers consecutive words
to be duplicates if they are not in the same case.  If non-nil, the
default, words are considered to be duplicates even if their letters'
case does not match.

---
** 'write-abbrev-file' now includes special properties.
'write-abbrev-file' now writes special properties like ':case-fixed'
for abbrevs that have them.

+++
** 'write-abbrev-file' skips empty tables.
'write-abbrev-file' now skips inserting a 'define-abbrev-table' form for
tables which do not have any non-system abbrevs to save.

+++
** The new functions and commands 'text-property-search-forward' and
'text-property-search-backward' have been added.  These provide an
interface that's more like functions like 'search-forward'.

---
** More commands support noncontiguous rectangular regions, namely
'upcase-dwim', 'downcase-dwim', 'replace-string', 'replace-regexp',
and 'delimit-columns-region'.

+++
** When asked to visit a large file, Emacs now offers visiting it literally.
Previously, Emacs would only ask for confirmation before visiting
large files.  Now it also offers a third alternative: to visit the
file literally, as in 'find-file-literally', which speeds up
navigation and editing of large files.

---
** 'add-dir-local-variable' now uses dotted pair notation syntax to
write alists of variables to ".dir-locals.el".  This is the same
syntax that you can see in the example of a ".dir-locals.el" file in
the node "(emacs) Directory Variables" of the user manual.

+++
** Network connections using 'local' can now use IPv6.
'make-network-process' now uses the correct loopback address when
asked to use ':host 'local' and ':family 'ipv6'.

+++
** The new function 'replace-region-contents' replaces the current
region using a given replacement-function in a non-destructive manner
(in terms of 'replace-buffer-contents').

+++
** The command 'replace-buffer-contents' now has two optional
arguments mitigating performance issues when operating on huge
buffers.

+++
** The command 'delete-indentation' now operates on the active region.
If the region is active, the command joins all the lines in the
region.  When there's no active region, the command works on the
current and the previous or the next line, as before.

\f
* Changes in Specialized Modes and Packages in Emacs 27.1

** The 'cl' package is now officially deprecated in favor of `cl-lib`.

+++
** winner
*** A new variable, `winner-boring-buffers-regexp', has been added.

** table
** `table-generate-source' and friends now support outputting wiki and
mediawiki format tables.

---
** telnet-mode
*** Reverting a buffer in `telnet-mode' will restart a closed
connection.

** goto-addr
*** A way to more conveniently specify what URI address schemes that
should be ignored have been added via the
`goto-address-uri-schemes-ignored' variable.

+++
** tex-mode
*** 'latex-noindent-commands' controls indentation of certain commands.
You can use this new variable to control indentation of arguments of
\emph, \footnote, and similar commands.

** byte compiler
*** byte-compile-dynamic is now obsolete
This is because on the one hand it suffers from various misbehaviors in corner
cases that have plagued it for years, and on the other experiments indicated
that it doesn't bring any measurable benefit.

** compile.el
---
*** In 'compilation-error-regexp-alist', 'line' (and 'end-line') can
be functions.

** cl-lib.el
+++
*** 'cl-defstruct' has a new ':noinline' argument to prevent inlining
its functions.

** doc-view.el
*** New commands 'doc-view-presentation' and 'doc-view-fit-window-to-page'.
*** Added support for password-protected PDF files

** Ido
*** New user option 'ido-big-directories' to mark directories whose
names match certain regular expressions as big.  Ido won't attempt to
list the contents of such directories when completing file names.

** Minibuffer

---
*** Minibuffer now uses 'minibuffer-message' to display error messages
at the end of the active minibuffer.

** map.el
*** Now also understands plists.
*** Now defined via generic functions that can be extended via 'cl-defmethod'.
*** Deprecate the 'map-put' macro in favor of a new 'map-put!' function.
*** 'map-contains-key' now returns a boolean rather than the key.
*** Deprecate the 'testfn' args of 'map-elt' and 'map-contains-key'.
*** New generic function 'map-insert'.

+++
** seq.el
New convenience functions 'seq-first' and 'seq-rest' give easy access
to respectively the first and all but the first elements of sequences.

The new predicate function 'seq-contains-p' should be used instead of
the now obsolete 'seq-contains'.

---
** Follow mode
In the current follow group of windows, "ghost" cursors are no longer
displayed in the non-selected follow windows.  To get the old behavior
back, customize 'follow-hide-ghost-cursors' to nil.

+++
** New variable 'warning-fill-column' for 'display-warning'.

** Windmove

*** 'windmove-create-window' when non-nil makes a new window on moving off
the edge of the frame.

*** Windmove supports directional window display and selection.
The new command 'windmove-display-default-keybindings' binds default
keys with provided modifiers (by default, Shift-Meta) to the commands
that display the next buffer in the window at the specified direction.
This is like 'windmove-default-keybindings' that binds keys to commands
that select the window in the specified direction, but additionally it
displays the buffer from the next command in that window.  For example,
'S-M-right C-h i' displays the "*Info*" buffer in the right window,
creating the window if necessary.  A special key can be customized to
display the buffer in the same window, for example, 'S-M-0 C-h e'
displays the "*Messages*" buffer in the same window.

*** Windmove also supports directional window deletion.
The new command 'windmove-delete-default-keybindings' binds default
keys with provided prefix (by default, 'C-x') and modifiers (by default,
'Shift') to the commands that delete the window in the specified
direction.  For example, 'C-x S-down' deletes the window below.
With a prefix arg 'C-u', also kills the buffer in that window.
With 'M-0', deletes the selected window and selects the window
that was in the specified direction.

*** New command 'windmove-swap-states-in-direction' binds default keys
to the commands that swap the states of the selected window with the
window in the specified direction.

** Octave mode
The mode is automatically enabled in files that start with the
'function' keyword.

** project.el

*** New commands 'project-search' and 'project-query-replace-regexp'.

*** New customizable variable 'project-read-file-name-function'.

** Etags

+++
*** 'next-file' is now an obsolete alias of 'tags-next-file'.

*** 'tags-loop-revert-buffers' is an obsolete alias of
'fileloop-revert-buffers'.

*** The 'tags-loop-continue' function along with the
'tags-loop-operate' and 'tags-loop-scan' variables are now obsolete;
use the new 'fileloop-initialize' and 'fileloop-continue' functions
instead.

+++
*** etags is now able to read Zstandard-compressed files.

** bibtex

---
*** New commands 'bibtex-next-entry' and 'bibtex-previous-entry'.
In 'bibtex-mode-map', 'forward-paragraph' and 'backward-paragraph' are
remapped to these, respectively.

** Dired

+++
*** New command 'dired-create-empty-file'.

+++
*** New command and keystroke `dired-number-of-marked-files' bound to
`* N'.

*** The marking commands now report how many files were marked by the
command itself, not how many files are marked in total.

** Find-Dired

*** New customizable variable 'find-dired-refine-function'.
The default value is 'find-dired-sort-by-filename'.

*** New sorting options for the variable 'find-ls-option'.

---
*** Zstandard compression is now supported for 'dired-do-compress' and
'dired-do-compress-to'.

** Change Logs and VC

*** Recording ChangeLog entries doesn't require an actual file.
If a ChangeLog file doesn't exist, and if the new variable
'add-log-dont-create-changelog-file' is non-nil (which is the
default), commands such as 'C-x 4 a' will add log entries to a
suitable named temporary buffer.  (An existing ChangeLog file will
still be used if it exists.)  Set the variable to nil to get the
previous behavior of always creating a buffer that visits a ChangeLog
file.

*** New customizable variable 'vc-find-revision-no-save'.
With non-nil, 'vc-find-revision' doesn't write the created buffer to file.

*** New customizable variable 'vc-git-grep-template'.
This new variable allows customizing the default arguments passed to
'git-grep' when 'vc-git-grep' is used.

*** Command 'vc-git-stash' now respects marks in the "*vc-dir*" buffer.
When some files are marked, only those are stashed.
When no files are marked, all modified files are stashed, as before.

*** The new hook 'vc-retrieve-tag-hook' runs after retrieving a tag.

---
*** 'vc-hg' now invokes 'smerge-mode' when visiting files.
Code that attempted to invoke 'smerge-mode' when visiting an Hg file
with conflicts existed in earlier versions of Emacs, but incorrectly
never detected a conflict due to invalid assumptions about cached
values.

+++
*** 'C-u C-x v D' ('vc-root-version-diff') prompts for two revisions
and compares their entire trees.

*** New user option 'vc-hg-revert-switches' specifies switches to pass
to Hg revert.

*** 'C-x v M D' ('vc-diff-mergebase') and 'C-x v M L' ('vc-log-mergebase')
print diffs and logs between the merge base (common ancestor) of two
given revisions.

+++
*** The new `d' command (`vc-dir-clean-files') in `vc-dir-mode'
buffers will delete the marked files (or if no files are marked, the
file under point).  This command does not notify the VC backend, and
is mostly useful for unregistered files.

*** New command 'vc-log-search' asks for a pattern string, searches
it in the revision log, and displays matched log entries in the
log buffer.  For example, 'M-x vc-log-search RET bug#36644 RET'
displays all entries whose log messages match the bug number.
With a prefix argument asks for a command, so for example,
'C-u M-x vc-log-search RET git log -1 f302475 RET' will display
just one log entry found by its revision number.

** Diff mode
+++
*** Hunks are now automatically refined by font-lock.
To disable refinement, set the new user option 'diff-refine' to nil.
To get back the old behavior where hunks are refined as you navigate
through a diff, set 'diff-refine' to the symbol 'navigate'.

+++
*** 'diff-auto-refine-mode' is deprecated in favor of 'diff-refine'.
It is no longer enabled by default and binding it no longer has any
effect.

+++
*** Better syntax highlighting of Diff hunks.
Fragments of source in Diff hunks are now by default highlighted
according to the appropriate major mode.  Customize the new option
'diff-font-lock-syntax' to nil to disable this.

*** File headers can be shortened, mimicking Magit's diff format.
To enable it, set the new user option 'diff-font-lock-prettify' to t.

+++
*** Prefix arg of 'diff-goto-source' means jump to the old revision
of the file under version control if point is on an old changed line,
or to the new revision of the file otherwise.

** Texinfo

+++
*** New function for inserting '@pxref', '@xref', or '@ref' commands.
The function 'texinfo-insert-dwim-@ref', bound to 'C-c C-c r' by
default, inserts one of three types of references based on the text
surrounding point, namely '@pxref' near a parenthesis, '@xref' at the
start of a sentence or at '(point-min)', else '@ref'.

** Browse-url

*** The function 'browse-url-emacs' can now visit a URL in selected window.
It now treats the optional 2nd argument to mean that the URL should be
shown in the currently selected window.

** Comint

+++
*** 'send-invisible' is now an obsolete alias for 'comint-send-invisible'.
Also, 'shell-strip-ctrl-m' is declared obsolete.

+++
*** 'C-c .' ('comint-insert-previous-argument') no longer interprets '&'.
This feature caused problems when '&&' was present in the previous
command.  Since this command emulates 'M-.' in Bash and zsh, neither
of which treats '&' specially, the feature was removed for
compatibility with these shells.

+++
*** 'comint-insert-previous-argument' can now count arguments from the end.
By default, invoking 'C-c .' with a numeric argument N would copy the
Nth argument, counting from the first one.  But if the new option
'comint-insert-previous-argument-from-end' is non-nil, it will copy
the Nth argument counting from the last one.  Thus 'C-c .' can now
better emulate 'M-.' in both Bash and zsh, since the former counts
from the beginning of the arguments, while the latter counts from the
end.

+++
*** 'comint-run' can now accept a list of switches to pass to the program.
'C-u M-x comint-run' will prompt for the switches interactively.

** SQL

*** SQL Indent Minor Mode
SQL Mode now supports the ELPA 'sql-indent' package for assisting
sophisticated SQL indenting rules.  Note, however, that SQL is not
like other programming languages like C, Java, or Python where code is
sparse and rules for formatting are fairly well established. Instead
SQL is more like COBOL (from which it came) and code tends to be very
dense and line ending decisions driven by syntax and line length
considerations to make readable code.  Experienced SQL developers may
prefer to rely upon existing Emacs facilities for formatting code but
the 'sql-indent' package provides facilities to aid more casual SQL
developers layout queries and complex expressions.

**** 'sql-use-indent-support' (default t) enables SQL indention support.
The 'sql-indent' package from ELPA must be installed to get the
indentation support in 'sql-mode' and 'sql-interactive-mode'.

**** 'sql-mode-hook' and 'sql-interactive-mode-hook' changed.
Both hook variables have had 'sql-indent-enable' added to their
default values. If you have existing customizations to these variables,
you should make sure that the new default entry is included.

*** Connection Wallet
Database passwords can now by stored in NETRC or JSON data files that
may optionally be encrypted. When establishing an interactive session
with the database via 'sql-connect' or a product specific function,
like 'sql-mysql' or 'my-postgres', the password wallet will be
searched for the password. The 'sql-product', 'sql-server',
'sql-database', and the 'sql-username' will be used to identify the
appropriate authorization. This eliminates the discouraged practice of
embedding database passwords in your Emacs initialization.

See the 'auth-source' module for complete documentation on the file
formats.  By default, the wallet file is expected to be in the
'user-emacs-directory', named 'sql-wallet' or '.sql-wallet', with
'.json' (JSON) or no (NETRC) suffix.  Both file formats can optionally
be encrypted with GPG by adding an additional '.gpg' suffix.

** Term

---
*** 'term-read-noecho' is now obsolete, use 'read-passwd' instead.

** Flymake

+++
*** The variable 'flymake-diagnostic-types-alist' is obsolete.
You should instead set properties on known diagnostic symbols, like
':error' and ':warning', as demonstrated in the Flymake manual.

*** New customizable variable 'flymake-start-on-save-buffer'.
Control whether Flymake starts checking the buffer on save.

*** Flymake and backend functions may exchange hints about buffer changes.
This enables more efficient backends.  See the docstring of
'flymake-diagnostic-functions' or the Flymake manual for details.

+++
*** 'flymake-start-syntax-check-on-newline' is now obsolete,
use 'post-self-insert-hook' to check on newline.

** Ruby

*** The Rubocop Flymake diagnostic function will only run Lint cops if
it can't find the config file.

*** Rubocop is called with 'bundle exec' if Gemfile mentions it.

*** New command 'ruby-find-library-file' bound to 'C-c C-f'.

** Package

*** Change of 'package-check-signature' for packages with multiple sigs
In previous Emacsen, 't' checked that all signatures are valid.
Now 't' only checks that at least one signature is valid and the new 'all'
value needs to be used if you want to enforce that all signatures
are valid.  This only affects packages with multiple signatures.

*** New function 'package-get-version' lets packages query their own version.
Example use in auctex.el: '(defconst auctex-version (package-get-version))'

*** New 'package-quickstart' feature.
When 'package-quickstart' is non-nil, package.el precomputes a big
autoloads file so that activation of packages can be done much faster,
which can speed up your startup significantly.
It also causes variables like 'package-user-dir' and
'package-load-list' to be consulted when 'package-quickstart-refresh'
is run rather than at startup so you don't need to set them in your
early init file.

*** New function 'package-activate-all'.

---
*** Imenu support has been added to `package-menu-mode'.

** Info

---
*** Info can now follow 'file://' protocol URLs.
The 'file://' URLs in Info documents can now be followed by passing
them to the 'browse-url' function, like the other protocols: ftp,
http, and https.  This allows to have references to local HTML files,
for example.

** Xref

+++
*** New command 'xref-find-definitions-at-mouse'.
This command finds definitions of the identifier at the place of a
mouse click event, and is intended to be bound to a mouse event.

+++
*** Changing 'xref-marker-ring-length' works after 'xref.el' is loaded.
Previously, setting 'xref-marker-ring-length' would only take effect
if set before 'xref.el' was loaded.

---
*** 'xref-find-definitions' now sets the mark at the buffer position
where it was invoked.

---
*** New xref faces 'xref-file-header', 'xref-line-number', 'xref-match'.

*** New variable 'xref-show-definitions-function'.
It encapsulates the logic pertinent to showing the result of
'xref-find-definitions'.  The user can change it to customize its
behavior and the display of results.

*** Search results show the buffer even for one hit.
The search-type Xref commands (e.g. 'xref-find-references' or
'project-find-regexp') now show the results buffer even when there is
only one hit.  This can be altered by changing
'xref-show-xrefs-function'.

*** Xref buffers support refreshing the search results.
A new command 'xref-revert-buffer' is bound to 'g'.

** Ecomplete

*** The ecomplete sorting has changed to a decay-based algorithm.
This can be controlled by the new 'ecomplete-sort-predicate' variable.

*** The 'ecompleterc' file is now placed in '~/.emacs.d/ecompleterc' by default.
Of course it will still find it if you have it in '~/.ecompleterc'.

** Gnus

+++
*** There's a new value for `gnus-article-date-headers',
`combined-local-lapsed', which will show both the time (in the local
timezone) and the lapsed time.

---
*** Gnus now maps imaps to 993 only on old MS-Windows versions.
The nnimap backend used to do this unconditionally to work around
problems on old versions of MS-Windows.  This is now done only for
Windows XP and older.

+++
*** The nnimap backend now has support for IMAP namespaces.
This feature can be enabled by setting the new 'nnimap-use-namespaces'
server variable to non-nil.

+++
*** A prefix argument to 'gnus-summary-limit-to-score' will limit reverse.
Limit to articles with score at below.

*** The function 'gnus-score-find-favorite-words' has been renamed
from 'gnus-score-find-favourite-words'.

---
*** Gmane has been removed as an nnir backend, since Gmane no longer
has a search engine.

+++
*** Splitting mail on common mailing list headers has been added.
See the concept index in the Gnus manual for the 'match-list' entry.

+++
*** nil is no longer an allowed value for 'mm-text-html-renderer'.

+++
*** A new Gnus summary mode command, 'S A'
('gnus-summary-attach-article') can be used to attach the current
article(s) to a pre-existing Message buffer, or create a new Message
buffer with the article(s) attached.

+++
*** A new Gnus summary mode command, 'w'
('gnus-summary-browse-url') scans the article buffer for URLs, and
offers them to the user to open with 'browse-url'.

---
*** New option 'nnir-notmuch-filter-group-names-function'.
This option controls whether and how to use Gnus search groups as
'path:' search terms to 'notmuch'.

** erc

---
*** 'erc-button-google-url' has been renamed to 'erc-button-search-url'
and its value has been changed to Duck Duck Go.

---
*** `erc-send-pre-hook' and `erc-send-this' have been obsoleted.  The
variable to use instead to alter text to be sent is now
`erc-pre-send-functions'.

** EUDC

*** XEmacs support has been removed.

** eww/shr

+++
*** The 'eww' command can now create a new EWW buffer.
Invoking the command with a prefix argument will cause it to create a
new EWW buffer for the URL instead of reusing the default one.

+++
*** The 'd' ('eww-download') command now falls back to current page's URL.
If this command is invoked with no URL at point, it now downloads the
current page instead of signaling an error.

*** When opening external links in eww/shr (typically with the
'C-u RET' keystroke on a link), the link will be flashed with the new
'shr-selected-link' face to give the user feedback that the command
has been executed.

+++
*** New option 'shr-discard-aria-hidden'.
If set, shr will not render tags with attribute 'aria-hidden="true"'.
This attribute is meant to tell screen readers to ignore a tag.

---
*** 'shr-tag-ol' now respects the ordered list 'start' attribute.

---
*** The following tags are now handled: <code>, <abbr>, and <acronym>.

** Htmlfontify

*** The functions 'hfy-color', 'hfy-color-vals' and
'hfy-fallback-color-values' and the variables 'hfy-fallback-color-map'
and 'hfy-rgb-txt-color-map' have been renamed from names that used
'colour' instead of 'color'.

+++
** Enriched mode supports the 'charset' text property.
You can add or modify the 'charset' text properties of text using the
'Edit->Text Properties->Special Properties' menu, or by invoking the
'facemenu-set-charset' command.  Documents in Enriched mode will be
saved with the charset properties, and those properties will be
restored when the file is visited.

** Smtpmail

Authentication mechanisms can be added via external packages, by
defining new 'cl-defmethod' of 'smtpmail-try-auth-method'.

** Footnote mode

*** Support Hebrew-style footnotes
*** Footnote text lines are now aligned.
Can be controlled via the new variable 'footnote-align-to-fn-text'.

** CSS mode

---
*** A new command 'css-cycle-color-format' for cycling between color
formats (e.g. "black" => "#000000" => "rgb(0, 0, 0)") has been added,
bound to 'C-c C-f'.

---
*** CSS mode, SCSS mode, and Less CSS mode now have support for Imenu.

** SGML mode

---
*** 'sgml-quote' now handles double quotes and apostrophes
when escaping text and in addition all numeric entities when
unescaping text.

** Python mode

---
*** Python mode supports three different font lock decoration levels.
The maximum level is used by default; customize
'font-lock-maximum-decoration' to tone down the decoration.

** Dired

+++
*** The new user option 'dired-create-destination-dirs' controls whether
'dired-do-copy' and 'dired-rename-file' should create non-existent
directories in the destination.

** Help

---
*** Description of variables and functions give an estimated first release.

---
*** Output format of 'C-h l' ('view-lossage') has changed.
For convenience, 'view-lossage' now displays the last keystrokes
and commands in the same format as the edit buffer of
'edit-last-kbd-macro'.  This makes it possible to copy the lines from
the buffer generated by 'view-lossage' to the "*Edit Macro*" buffer
created by 'edit-last-kbd-macro', and to save the macro by 'C-c C-c'.

---
*** The list of help commands produced by 'C-h C-h' ('help-for-help')
can now be searched via 'C-s'.

** Ibuffer

---
*** New filter 'ibuffer-filter-by-process'; bound to '/E'.

---
*** All mode filters can now accept a list of symbols.
This means you can now easily filter several major modes, as well
as a single mode.

** Search and Replace

*** Isearch supports a prefix argument for 'C-s' ('isearch-repeat-forward')
and 'C-r' ('isearch-repeat-backward').  With a prefix argument, these
commands repeat the search for the specified occurrence of the search string.
A negative argument repeats the search in the opposite direction.
This makes possible also to use a prefix argument for 'M-s .'
('isearch-forward-symbol-at-point') to find the next Nth symbol.

*** To go to the first/last occurrence of the current search string
is possible now with new commands 'isearch-beginning-of-buffer' and
'isearch-end-of-buffer' bound to 'M-s M-<' and 'M-s M->' in Isearch.
With a numeric argument, they go to the Nth absolute occurrence
counting from the beginning/end of the buffer.  This complements
'C-s'/'C-r' that searches for the next Nth relative occurrence
with a numeric argument.

*** 'isearch-lazy-count' shows the current match number and total number
of matches in the Isearch prompt.  Customizable variables
'lazy-count-prefix-format' and 'lazy-count-suffix-format' define the
format of the current and the total number of matches in the prompt's
prefix and suffix respectively.

*** 'lazy-highlight-buffer' highlights matches in the full buffer.
It is useful in combination with 'lazy-highlight-cleanup' customized to nil
to leave matches highlighted in the whole buffer after exiting isearch.
Also when 'lazy-highlight-buffer' prepares highlighting in the buffer,
navigation through the matches without flickering is more smooth.
'lazy-highlight-buffer-max-at-a-time' controls the number of matches to
highlight in one iteration while processing the full buffer.

+++
*** New isearch bindings.

'C-M-w' in isearch changed from 'isearch-del-char' to the new function
'isearch-yank-symbol-or-char'.  'isearch-del-char' is now bound to
'C-M-d'.

+++
'M-s h l' invokes highlight-lines-matching-regexp using the search
string to highlight lines matching the search string.  This is similar
to the existing binding 'M-s h r' (highlight-regexp) that highlights
JUST the search string.

+++
*** New variable 'isearch-yank-on-move' provides options 't' and 'shift'
to extend the search string by yanking text that ends at the new
position after moving point in the current buffer.  'shift' extends
the search string by motion commands while holding down the shift key.

*** 'isearch-allow-scroll' provides new option 'unlimited' to allow
scrolling any distance off screen.

---
*** Isearch now remembers the regexp-based search mode for words/symbols
and case-sensitivity together with search strings in the search ring.

---
*** Isearch now has its own tool-bar and menu-bar menu.

+++
*** 'flush-lines' prints and returns the number of deleted matching lines.

** Debugger

+++
*** The Lisp Debugger is now based on 'backtrace-mode'.
Backtrace mode adds fontification and commands for changing the
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.

** Edebug

+++
*** The runtime behavior of Edebug's instrumentation can be changed
using the new variables 'edebug-behavior-alist',
'edebug-after-instrumentation-function' and
'edebug-new-definition-function'.  Edebug's behavior can be changed
globally or for individual definitions.

+++
*** Edebug's backtrace buffer now uses 'backtrace-mode'.
Backtrace mode adds fontification, links and commands for changing the
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.

The binding of 'd' in Edebug's keymap is now 'edebug-pop-to-backtrace'
which replaces 'edebug-backtrace'.  Consequently Edebug's backtrace
windows now behave like those of the Lisp Debugger and of ERT, in that
when they appear they will be the selected window.

The new 'backtrace-goto-source' command, bound to 's', works in
Edebug's backtraces on backtrace frames whose source code has
been instrumented by Edebug.

** Enhanced xterm support

*** New variable 'xterm-set-window-title' controls whether Emacs sets
the XTerm window title.  This feature is experimental and is disabled
by default.

** Grep

+++
*** 'rgrep', 'lgrep' and 'zrgrep' now hide part of the command line
that contains a list of ignored directories and files.
Clicking on the button with ellipsis unhides it.
The abbreviation can be disabled by the new option
'grep-find-abbreviate'.  The new command
'grep-find-toggle-abbreviation' toggles it interactively.

*** 'grep-find-use-xargs' is now customizable with sorting options.

** ERT

+++
*** New variable 'ert-quiet' allows to make ERT output in batch mode
less verbose by removing non-essential information.

+++
*** ERT's backtrace buffer now uses 'backtrace-mode'.
Backtrace mode adds fontification and commands for changing the
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.

** Gamegrid

---
*** Gamegrid now determines its default glyph size based on display
dimensions, instead of always using 16 pixels.  As a result, Tetris,
Snake and Pong are more playable on HiDPI displays.

** Filecache

---
*** Completing filenames in the minibuffer via 'C-TAB' now uses the
styles as configured by the variable 'completion-styles'.

** New macros 'thunk-let' and 'thunk-let*'.
These macros are analogue to 'let' and 'let*', but create bindings that
are evaluated lazily.

** next-error

+++
*** New customizable variable 'next-error-find-buffer-function'.
The value should be a function that determines how to find the
next buffer to be used by 'next-error' and 'previous-error'.  The
default is to use the last buffer that navigated to the current
error.

+++
*** New command 'next-error-select-buffer'.
It can be used to set any buffer as the next one to be used by
'next-error' and 'previous-error'.

** nxml-mode

---
*** The default value of 'nxml-sexp-element-flag' is now t.
This means that pressing 'C-M-SPACE' now selects the entire tree by
default, and not just the opening element.

** Eshell

*** TAB completion uses the standard 'completion-at-point' rather than
'pcomplete'.  Its UI is slightly different but can be customized to
behave similarly, e.g. Pcomplete's default cycling can be obtained
with '(setq completion-cycle-threshold 5)'.

---
*** Expansion of history event designators is disabled by default.
To restore the old behavior, use

    (add-hook 'eshell-expand-input-functions
              #'eshell-expand-history-references)

---
*** The function 'eshell-uniquify-list' has been renamed from
'eshell-uniqify-list'.

*** The function 'eshell/kill' is now able to handle signal switches.
Previously 'eshell/kill' would fail if provided a kill signal to send
to the process.  It now accepts signals specified either by name or by
its number.

---
*** Emacs now follows symlinks in history-related files.
The files specified by 'eshell-history-file-name' and
'eshell-last-dir-ring-file-name' can include symlinks; these are now
followed when Emacs writes the relevant history variables to the disk.

** Shell

---
*** Program name completion inside remote shells works now as expected.

+++
*** The variable 'shell-file-name' can be set now as connection-local
variable for remote shells.  It still defaults to "/bin/sh".

** Single shell commands

+++
*** 'async-shell-command-width' defines the number of display columns
available for output of asynchronous shell commands.

** Pcomplete

*** The function 'pcomplete-uniquify-list' has been renamed from
'pcomplete-uniqify-list'.

** Auth-source

---
*** The Secret Service backend supports the ':create' key now.

** Tramp

+++
*** New connection method "nextcloud", which allows to access OwnCloud
or NextCloud hosted files and directories.

+++
*** New connection method "rclone", which allows to access system
storages via the 'rclone' program.  This feature is experimental.

+++
*** New connection method "sudoedit", which allows to edit local files
with different user credentials.  Contrary to the "sudo" method, no
session is run permanently in the background.  This is for security
reasons.

+++
*** Connection methods "obex" and "synce" are removed, because they
are obsoleted in GVFS.

+++
*** Validated passwords are saved by auth-source backends which support this.

+++
*** During user and host name completion in the minibuffer, results
from auth-source search are taken into account.  This can be disabled
by setting the user option 'tramp-completion-use-auth-sources' to nil.

+++
*** The user option 'tramp-ignored-file-name-regexp' allows to disable
Tramp for some look-alike remote file names.

+++
*** For some connection methods, like "su" or "sudo", the host name in
ad-hoc multi-hop file names must match the previous hop.  Default host
names are adjusted to the host name from the previous hop.

+++
*** For the connection methods "sudo" and "doas" there exists a
timeout, after which the underlying session is disabled.  This is for
security reasons.

** Rcirc

---
*** New user option 'rcirc-url-max-length'.
Setting this option to an integer causes URLs displayed in Rcirc
buffers to be truncated to that many characters.

---
*** The default /quit and /part reasons are now configurable.
Two new user options are provided for this:
'rcirc-default-part-reason' and 'rcirc-default-quit-reason'.

** Register

---
*** The return value of method 'register-val-describe' includes the
names of buffers shown by the windows of a window configuration.

---
** The options.el library has been removed.
It was obsolete since Emacs 22.1, replaced by customize.

** The tls.el and starttls.el libraries are now marked obsolete.
Use of built-in libgnutls based functionality (described in the Emacs
GnuTLS manual) is recommended instead.

** Message

+++
*** Messages can now be systematically encrypted
when the PGP keyring contains a public key for every recipient.  To
achieve this, add 'message-sign-encrypt-if-all-keys-available' to
'message-send-hook'.

---
*** When replying a message that have addresses on the form
'"foo@bar.com" <foo@bar.com>', Message will elide the repeated "name"
from the address field in the response.

---
*** The default of 'message-forward-as-mime' has changed from t to nil
as it has been reported that many recipients can't read forwards that
are formatted as MIME digests.

+++
*** 'message-forward-included-headers' has changed its default to
exclude most headers when forwarding.

*** 'mml-secure-openpgp-sign-with-sender' sets also "gpg --sender"
When 'mml-secure-openpgp-sign-with-sender' is non-nil message sender's
email address (in addition to its old behaviour) will also be used to
set gpg's "--sender email@domain" option.

The option is useful for two reasons when verifying the signature:

 1. GnuPG's TOFU statistics are updated for the specific user id
    (email) only. See gpg(1) man page about "--sender".

 2. GnuPG's --auto-key-retrieve functionality can use WKD (web key
    directory) method for finding the signer's key. You need GnuPG
    2.2.17 to fully benefit from this feature. See gpg(1) man page for
    "--auto-key-retrieve".

---
** EasyPG

---
*** 'epa-pinentry-mode' is renamed to 'epg-pinentry-mode'.
It now applies to epg functions as well as epa functions.

---
*** The alias functions 'epa--encode-coding-string',
'epa--decode-coding-string', and 'epa--select-safe-coding-system' have
been removed.  Use 'encode-coding-string', 'decode-coding-string', and
'select-safe-coding-system' instead.

*** 'epg-context' structure supports now 'sender' slot
The value of the new 'sender' slot (if a string) is used to set gpg's
--sender option. This feature is used by
'mml-secure-openpgp-sign-with-sender'. See gpg(1) manual page about
"--sender" for more information.

---
** Rmail

+++
*** New user option 'rmail-output-reset-deleted-flag'.
If this option is non-nil, messages appended to an output file by the
'rmail-output' command have their Deleted flag reset.

*** The command 'rmail-summary-by-senders' with an empty argument
selects the messages to summarize with a regexp that matches the
sender of the current message.

** Threads

+++
*** New variable 'main-thread' holds Emacs's main thread.
This is handy in Lisp programs that run on a non-main thread and want
to signal the main thread, e.g., when they encounter an error.

+++
*** 'thread-join' returns the result of the finished thread now.

+++
*** 'thread-signal' does not propagate errors to the main thread.
Instead, error messages are just printed in the main thread.

---
*** 'thread-alive-p' is now obsolete, use 'thread-live-p' instead.

+++
*** New command 'list-threads' shows Lisp threads.
See the current list of live threads in a tabulated-list buffer which
automatically updates.  In the buffer, you can use 's q' or 's e' to
signal a thread with quit or error respectively, or get a snapshot
backtrace with 'b'.


** thingatpt.el

---
*** 'thing-at-point' supports a new "thing" called 'uuid'.
A symbol 'uuid' can be passed to 'thing-at-point' and it returns the
UUID at point.

---
*** 'word-at-point' and 'sentence-at-point' accept NO-PROPERTIES.
Just like 'thing-at-point' itself.

** Interactive automatic highlighting

+++
*** 'highlight-regexp' can now highlight subexpressions.
The new command accepts a prefix numeric argument to choose the
subexpression.

** Mouse display of minor mode menu

---
*** 'minor-mode-menu-from-indicator' now displays full minor mode name.
When there is no menu for a mode, display the mode name after the
indicator instead of just the indicator (which is sometimes cryptic).

** rx

---
*** rx now handles raw bytes in character alternatives correctly,
when given in a string.  Previously, '(any "\x80-\xff")' would match
characters U+0080...U+00FF.  Now the expression matches raw bytes in
the 128...255 range, as expected.

---
*** The rx 'or' and 'seq' forms no longer require any arguments.
(or) produces a regexp that never matches anything, while (seq)
matches the empty string, each being an identity for the operation.
This also works for their aliases: '|' for 'or'; ':', 'and' and
'sequence' for 'seq'.

---
*** 'regexp' and new 'literal' accept arbitrary lisp as arguments.
In this case, 'rx' will generate code which produces a regexp string
at run time, instead of a constant string.

** Frames

+++
*** New command 'make-frame-on-monitor' makes a frame on the specified monitor.

+++
*** New value of 'minibuffer' frame parameter 'child-frame'.
This allows to create and parent immediately a minibuffer-only child
frame when making a frame.

---
*** New predicates 'display-blink-cursor-p' and 'display-symbol-keys-p'.
These predicates are to be preferred over 'display-graphic-p' when
testing for blinking cursor capability and the capability to have
symbols (e.g., '[return]', '[tab]', '[backspace]') as keys respectively.

** Tabulated List mode

+++
*** New user options for tabulated list sort indicators.
You can now customize which sorting indicator character to display
near the current column in Tabulated Lists (see variables
'tabulated-list-gui-sort-indicator-asc',
'tabulated-list-gui-sort-indicator-desc',
'tabulated-list-tty-sort-indicator-asc', and
'tabulated-list-tty-sort-indicator-desc').

+++
*** Two new commands and keystrokes have been added to the tabulated
list mode: `w' (which widens the current column) and `c' which makes
the current column contract.

** Text mode

+++
*** 'text-mode-variant' is now obsolete, use 'derived-mode-p' instead.

** CUA mode

---
*** New user option 'cua-rectangle-terminal-modifier-key'.
This user option allows for the customization of the modifier key used
in a terminal frame.

** JS mode

---
*** JSX syntax is now automatically detected and enabled.
If a file imports Facebook's 'React' library, or if the file uses the
extension '.jsx', then various features supporting XML-like syntax
will be supported in 'js-mode' and derivative modes.  ('js-jsx-mode'
no longer needs to be enabled.)

---
*** New user option 'js-jsx-detect-syntax' disables automatic detection.
This is turned on by default.

---
*** New user option 'js-jsx-syntax' enables JSX syntax unconditionally.
This is off by default.

---
*** New variable 'js-jsx-regexps' controls JSX detection.

---
*** JSX syntax is now highlighted like SGML.

---
*** JSX code is properly indented in many more scenarios.
Previously, JSX indentation usually only worked when an element was
wrapped in parenthesis (e.g. in a 'return' statement or a function
call).  It would also fail in many intricate cases.  Now, indentation
should work anywhere without parenthesis; many more intricacies are
supported; and, indentation conventions align more closely with those
of the React developer community (see 'js-jsx-align->-with-<'),
otherwise still adhering to SGML conventions.

---
*** New user option 'js-jsx-align->-with-<' controls '>' indents.
Commonly in JSX code, a '>' on its own line is indented at the same
level as its opening '<'.  This is the new default for JSX.  This
behavior is slightly different than that used by SGML in Emacs, where
'>' is indented at the same level as attributes, which was also the
old default for JSX.

This is turned on by default.  To get back the old default indentation
behavior of aligning '>' with attributes, set 'js-jsx-align->-with-<'
to nil.

---
*** Indentation uses 'js-indent-level' instead of 'sgml-basic-offset'.
Since JSX is a syntax extension of JavaScript, it makes the most sense
for JSX expressions to be indented the same number of spaces as other
JS expressions.  This is a breaking change, but it probably aligns
with how you'd expect this indentation to behave.  If you want JSX to
be indented like JS, you won't need to change your config.

The old behavior can be emulated by controlling JSX indentation
independently of JS, by setting 'js-jsx-indent-level'.

---
*** New user option 'js-jsx-indent-level' for different JSX indentation.
If you wish to indent JSX by a different number of spaces than JS, set
this user option to the desired number.

---
*** New user option 'js-jsx-attribute-offset' for JSX attribute indents.

---
*** New variable 'js-syntactic-mode-name' controls mode name display.
Previously, the mode name was simply 'JavaScript'.  Now, when a syntax
extension like JSX is enabled, the mode name is 'JavaScript[JSX]'.
Set this variable to nil to disable the new behavior.

---
*** New function 'js-use-syntactic-mode-name' for deriving modes.
Packages deriving from 'js-mode' with 'define-derived-mode' should
call this function to add enabled syntax extensions to their mode
name, too.

** Autorevert

*** New variable 'auto-revert-avoid-polling' for saving power.
When set to a non-nil value, buffers in Auto Revert mode are no longer
polled for changes periodically.  This reduces the power consumption
of an idle Emacs, but may fail on some network file systems; set
'auto-revert-notify-exclude-dir-regexp' to match files where
notification is not supported.  The default value is nil.

*** New variable 'buffer-auto-revert-by-notification'
A major mode can declare that notification on the buffer's default
directory is sufficient to know when updates are required, by setting
the new variable 'buffer-auto-revert-by-notification' to a non-nil
value.  Auto Revert mode can use this information to avoid polling the
buffer periodically when 'auto-revert-avoid-polling' is non-nil.

** auth-source-pass

+++
*** New customizable variable 'auth-source-pass-filename'.
Allows setting the path to the password-store, defaults to
~/.password-store.

+++
*** New customizable variable 'auth-source-pass-port-separator'.
Specifies separator between host and port, defaults to colon ":".

---
*** Minimize the number of decryptions during password lookup.
This makes the package usable with physical tokens requiring touching
a sensor for every decryption.

---
*** 'auth-source-pass-get' is now autoloaded.

** Bookmarks

---
*** 'bookmark-file' and 'bookmark-old-default-file' are now obsolete
aliases of 'bookmark-default-file'.

*** New user option 'bookmark-watch-bookmark-file'.
When non-nil, watch whether the bookmark file has changed on disk.

---
** The mantemp.el library is now marked obsolete.
This library generates manual C++ template instantiations.  It should
no longer be useful on modern compilers, which do this automatically.

** Ispell

---
*** New hook 'ispell-change-dictionary-hook'.
This runs after changing the dictionary and could be used to
automatically spellcheck a buffer when changing language without
needing to advice 'ispell-change-dictionary'.

** scroll-lock

---
*** New command 'scroll-lock-next-line-always-scroll'.
This command is bound to 'S-down' and scrolls the buffer up in
particular when the end of the buffer is visible in the window.

** mwheel.el

---
*** 'mwheel-install' is now obsolete.
Use 'mouse-wheel-mode' instead.  Note that 'mouse-wheel-mode' is
already enabled by default on most graphical displays.

\f
* New Modes and Packages in Emacs 27.1

** fileloop.el lets one setup multifile operations like search&replace.

+++
** Emacs can now visit files in archives as if they were directories.
This feature uses Tramp and works only on systems which support GVFS,
i.e. GNU/Linux, roughly spoken.  See the node "(tramp) Archive file
names" in the Tramp manual for full documentation of these facilities.

+++
** New library for writing JSONRPC applications (https://jsonrpc.org).
The 'jsonrpc' library enables writing Emacs Lisp applications that
rely on this protocol.  Since the protocol is designed to be
transport-agnostic, the library provides an API to implement new
transport strategies as well as a separate API to use them.  A
transport implementation for process-based communication, such as is
used by the Language Server Protocol (LSP), is readily available.

+++
** Backtrace mode improves viewing of Elisp backtraces.
Backtrace mode adds pretty printing, fontification and ellipsis
expansion to backtrace buffers produced by the Lisp debugger, Edebug
and ERT.  See the node "(elisp) Backtraces" in the Elisp manual for
documentation of the new mode and its commands.

+++
** so-long.el helps to mitigate performance problems with long lines.
When 'global-so-long-mode' has been enabled, visiting a file with very
long lines will (subject to configuration) cause the user's preferred
'so-long-action' to be automatically invoked (by default, the buffer's
major mode is replaced by 'so-long-mode').  In extreme cases this can
prevent delays of several minutes, and make Emacs responsive almost
immediately.  Type 'M-x so-long-commentary' for full documentation.
\f
* Incompatible Lisp Changes in Emacs 27.1

---
** The REGEXP in 'magic-mode-alist' is now matched case-sensitively.
Likewise for 'magic-fallback-mode-alist'.

+++
** add-hook does not always add to the front or the end any more.
The replacement of `append` with `depth` implies that the function is not
always added to the very front (when append/depth is nil) or the very end (when
append/depth is t) any more because other functions on the hook may have
specified higher/lower depths.

** In 'compilation-error-regexp-alist' the old undocumented feature
where 'line' could be a function of 2 arguments has been dropped.

** 'define-fringe-bitmap' is always defined, even when Emacs is built
without any GUI support.

---
** Just loading a theme's file no longer activates the theme's settings.
Loading a theme with 'M-x load-theme' still activates the theme, as it
did before.  However, loading the theme's file with 'M-x load-file',
or using 'require' or 'load' in a Lisp program, doesn't actually apply
the theme's settings until you either invoke 'M-x enable-theme' or
type 'M-x load-theme'.  (In a Lisp program, calling 'enable-theme' or
invoking 'load-theme' with NO-ENABLE argument omitted or nil has the
same effect of activating a theme whose file has been loaded.)  The
special case of the 'user' theme is an exception: it is frequently
used for ad-hoc customizations, so the settings of that theme are by
default applied immediately.

The variable 'custom--inhibit-theme-enable' controls this behavior;
its default value changed in Emacs 27.1.

** The REPETITIONS argument of 'benchmark-run' can now also be a variable.

** Interpretation of relative 'HOME' directory has changed.
If "$HOME" is set to a relative file name, 'expand-file-name' now
interprets it relative to the directory where Emacs was started, not
relative to the 'default-directory' of the current buffer.  We recommend
always setting "$HOME" to an absolute file name, so that its meaning is
independent of where Emacs was started.

** The FILENAME argument to 'file-name-base' is now mandatory and no
longer defaults to 'buffer-file-name'.

---
** The function 'eldoc-message' now accepts a single argument.
Programs that called it with multiple arguments before should pass
them through 'format' first.  Even that is discouraged: for ElDoc
support, you should set 'eldoc-documentation-function' instead of
calling 'eldoc-message' directly.

** Old-style backquotes now generate an error.
They have been generating warnings for a decade.  To interpret
old-style backquotes as new-style, bind the new variable
'force-new-style-backquotes' to t.

** Defining a Common Lisp structure using 'cl-defstruct' or
'cl-struct-define' whose name clashes with a builtin type (e.g.,
'integer' or 'hash-table') now signals an error.

** When formatting a floating-point number as an octal or hexadecimal
integer, Emacs now signals an error if the number is too large for the
implementation to format.

** 'logb' now returns infinity when given an infinite or zero argument,
and returns a NaN when given a NaN.  Formerly, it returned an extreme
fixnum for such arguments.

---
** Some functions and variables obsolete since Emacs 22 have been removed:
archive-mouse-extract, assoc-ignore-case, assoc-ignore-representation,
backward-text-line, blink-cursor, bookmark-exit-hooks,
c-opt-op-identitier-prefix, comint-use-prompt-regexp-instead-of-fields,
compilation-finish-function, count-text-lines, cperl-vc-header-alist,
custom-face-save-command, cvs-display-full-path, cvs-fileinfo->full-path,
delete-frame-hook, derived-mode-class, describe-char-after, describe-project,
desktop-basefilename, desktop-buffer-handlers, desktop-buffer-misc-functions,
desktop-buffer-modes-to-save, desktop-enable, desktop-load-default,
dired-omit-files-p, disabled-command-hook, dungeon-mode-map,
electric-nroff-mode, electric-nroff-newline, electric-perl-terminator,
focus-frame, forward-text-line, generic-define-mswindows-modes,
generic-define-unix-modes, generic-font-lock-defaults, goto-address-at-mouse,
highlight-changes-colours, ibuffer-elide-long-columns, ibuffer-hooks,
ibuffer-mode-hooks, icalendar-convert-diary-to-ical,
icalendar-extract-ical-from-buffer, imenu-always-use-completion-buffer-p,
ipconfig-program, ipconfig-program-options, isearch-lazy-highlight-cleanup,
isearch-lazy-highlight-initial-delay, isearch-lazy-highlight-interval,
isearch-lazy-highlight-max-at-a-time, iswitchb-use-fonts,
latin1-char-displayable-p, mouse-wheel-click-button, mouse-wheel-down-button,
mouse-wheel-up-button, new-frame, pascal-outline, process-kill-without-query,
recentf-menu-append-commands-p, rmail-pop-password,
rmail-pop-password-required, savehist-load, set-default-font,
spam-list-of-processors, speedbar-add-ignored-path-regexp,
speedbar-buffers-line-path, speedbar-ignored-path-expressions,
speedbar-ignored-path-regexp, speedbar-line-path, speedbar-path-line,
timer-set-time-with-usecs, tooltip-gud-display, tooltip-gud-modes,
tooltip-gud-toggle-dereference, unfocus-frame, unload-hook-features-list,
update-autoloads-from-directories, vc-comment-ring, vc-comment-ring-index,
vc-comment-search-forward, vc-comment-search-reverse, vc-comment-to-change-log,
vc-diff-switches-list, vc-next-comment, vc-previous-comment, view-todo,
x-lost-selection-hooks, x-sent-selection-hooks.

---
** Further functions and variables obsolete since Emacs 24 have been removed:
default-directory-alist, dired-default-directory,
dired-default-directory-alist, dired-enable-local-variables,
dired-hack-local-variables, dired-local-variables-file, dired-omit-here-always.

** Garbage collection no longer treats miscellaneous objects specially;
they are now allocated like any other pseudovector.  As a result, the
'garbage-collect' and 'memory-use-count' functions no longer return a
'misc' component, and the 'misc-objects-consed' variable has been
removed.

+++
** Reversed character ranges are no longer permitted in 'rx'.
Previously, ranges where the starting character is greater than the
ending character were silently omitted.
For example, '(rx (any "@z-a" (?9 . ?0)))' would match '@' only.
Now, such 'rx' expressions generate an error.

+++
** 'text-mode' no longer sets the value of 'indent-line-function'.
The global value of 'indent-line-function', which defaults to
'indent-relative', will no longer be reset locally when turning on
'text-mode'.

To get back the old behavior, add a function to 'text-mode-hook' which
performs '(setq-local indent-line-function #'indent-relative)'.

** 'make-process' no longer accepts a non-nil ':stop' key.  This has
never worked reliably, and now causes an error.

+++
** 'eventp' no longer returns non-nil for lists whose car is nil.
This is consistent with the fact that nil, though a symbol, is not a
valid event type.

---
** The obsolete package xesam.el (since Emacs 24) has been removed.

\f
* Lisp Changes in Emacs 27.1

** defcustom now takes a :local keyword that can be either t or
`permanent', which mean that the variable should be automatically
buffer-local.  `permanent' also sets the variable's
`permanent-local' property.

+++
** The new macro `with-suppressed-warnings' can be used to suppress
specific byte-compile warnings.

---
** The new function `byte-compile-info-message' can be used to output
informational messages that look pleasing during the Emacs build.

+++
** The 'append' arg of 'add-hook' is generalized to a finer notion of 'depth'
This makes it possible to control the ordering of functions more precisely,
as was already possible in 'add-function' and `advice-add`.

---
** New 'help-fns-describe-variable-functions' hook.
Makes it possible to add metadata information to 'describe-variable'.

** i18n (internationalization)

*** ngettext can be used now to return the right plural form
according to the given numeric value.

+++
** 'inhibit-null-byte-detection' is renamed to 'inhibit-nul-byte-detection'.

+++
** 'self-insert-command' takes the char to insert as (optional) argument.

** 'lookup-key' can take a list of keymaps as argument.

+++
** 'condition-case' now accepts 't' to match any error symbol.

+++
** New function 'proper-list-p'.
Given a proper list as argument, this predicate returns its length;
otherwise, it returns nil.  'format-proper-list-p' is now an obsolete
alias for the new function.

+++
** Emacs Lisp integers can now be of arbitrary size.
Emacs uses the GNU Multiple Precision (GMP) library to support
integers whose size is too large to support natively.  The integers
supported natively are known as "fixnums", while the larger ones are
"bignums".  The new predicates 'bignump' and 'fixnump' can be used to
distinguish between these two types of integers.

All the arithmetic, comparison, and logical (a.k.a. "bitwise")
operations where bignums make sense now support both fixnums and
bignums.  However, note that unlike fixnums, bignums will not compare
equal with 'eq', you must use 'eql' instead.  (Numerical comparison
with '=' works on both, of course.)

Since large bignums consume a lot of memory, Emacs limits the size of
the largest bignum a Lisp program is allowed to create.  The
nonnegative value of the new variable 'integer-width' specifies the
maximum number of bits allowed in a bignum.  Emacs signals an integer
overflow error if this limit is exceeded.

Several primitive functions formerly returned floats or lists of
integers to represent integers that did not fit into fixnums.  These
functions now simply return integers instead.  Affected functions
include functions like 'encode-char' that compute code-points, functions
like 'file-attributes' that compute file sizes and other attributes,
functions like 'process-id' that compute process IDs, and functions like
'user-uid' and 'group-gid' that compute user and group IDs.

** Time values

+++
*** Although the default timestamp format is still '(HI LO US PS)',
it is planned to change in a future Emacs version, to exploit bignums.
The documentation has been updated to mention that the timestamp
format may change and that programs should use functions like
'format-time-string', 'decode-time', and 'encode-time' rather than
probing the innards of a timestamp directly, or creating a timestamp
by hand.

+++
*** 'encode-time' supports a new API '(encode-time TIME &optional FORM)'.
This can convert decoded times and Lisp time values to Lisp timestamps
of various forms, including a new timestamp form '(TICKS . HZ)', where
TICKS is an integer and HZ is a positive integer denoting a clock
frequency.  The old 'encode-time' API is still supported.

+++
*** 'time-add', 'time-subtract', and 'time-less-p' now accept
infinities and NaNs too, and propagate them or return nil like
floating-point operators do.

+++
*** New function 'time-equal-p' compares time values for equality.

+++
*** 'format-time-string' supports a new conversion specifier flag '+'
that acts like the '0' flag but also puts a '+' before nonnegative
years containing more than four digits.  This is for compatibility
with POSIX.1-2017.

** 'define-minor-mode' automatically documents the meaning of ARG.

+++
** The function 'recenter' now accepts an additional optional argument.
By default, calling 'recenter' will not redraw the frame even if
'recenter-redisplay' is non-nil.  Call 'recenter' with the new second
argument non-nil to force redisplay per 'recenter-redisplay's value.

+++
** New functions 'major-mode-suspend' and 'major-mode-restore'.
Use them when switching temporarily to another major mode, e.g. for
'hexl-mode', or to switch between 'c-mode' and 'image-mode' in XPM.

+++
** New macro 'dolist-with-progress-reporter'.
This works like 'dolist', but reports progress similar to
'dotimes-with-progress-reporter'.

+++
** New hook 'after-delete-frame-functions'.
This works like 'delete-frame-functions', but runs after the frame to
be deleted has been made dead and removed from the frame list.

---
** The function 'provided-mode-derived-p' was extended to support aliases.
The function now returns non-nil when the argument MODE is derived
from any alias of any of MODES.

+++
** New frame focus state inspection interface.
The hooks 'focus-in-hook' and 'focus-out-hook' are now obsolete.
Instead, attach to 'after-focus-change-function' using 'add-function'
and inspect the focus state of each frame using 'frame-focus-state'.

+++
** Emacs now requests and recognizes focus-change notifications from TTYs.
On terminal emulators that support the feature, Emacs can now support
'focus-in-hook' and 'focus-out-hook' for TTY frames.

+++
** Window-specific face remapping.
Face specifications (of the kind used in 'face-remapping-alist')
now support filters, allowing faces to vary between different windows
displaying the same buffer.  See the node "(elisp) Face Remapping"
of the Emacs Lisp Reference manual for more detail.

+++
** Window change functions have been redesigned.
Hooks reacting to window changes run now only when redisplay detects
that a change has actually occurred.  Six hooks are now provided:
'window-buffer-change-functions' (run after window buffers have
changed), 'window-size-change-functions' (run after a window was
assigned a new buffer or size), 'window-configuration-change-hook'
(like the former but run also when a window was deleted),
'window-selection-change-functions' (run when the selected window
changed) and 'window-state-change-functions' and
'window-state-change-hook' (run when any of the preceding ones is
run).  Applications can enforce running the latter two using the new
function 'set-frame-window-state-change'.  'window-scroll-functions'
are unaffected by these changes.

In addition, a number of functions now allow the caller to detect what
has changed since last redisplay: 'window-old-buffer' returns for any
window the buffer it showed at that time.  ‘old-selected-window’ and
'old-selected-frame' return the window and frame that were selected
during last redisplay.  'window-old-pixel-width' (renamed from
'window-pixel-width-before-size-change'), 'window-old-pixel-height'
(renamed from 'window-pixel-height-before-size-change'),
'window-old-body-pixel-width' and 'window-old-body-pixel-height'
return the total and body sizes of any window during last redisplay.

See the section "(elisp) Window Hooks" in the Elisp manual for a
detailed explanation of the new behavior.

+++
** Making scroll bar and fringe settings persistent for windows.
The functions 'set-window-scroll-bars' and 'set-window-fringes' now
have a new optional argument that makes the settings they produce
reliably survive subsequent invocations of 'set-window-buffer'.

+++
** New option 'resize-mini-frames'.
This option allows to automatically resize minibuffer-only frames
similarly to how minibuffer windows are resized on "normal" frames.

+++
** New buffer display action function 'display-buffer-in-direction'.
This function allows to specify the location of the window chosen by
'display-buffer' in various ways.

+++
** New buffer display action alist entry 'dedicated'.
Such an entry allows to specify the dedicated status of a window
created by 'display-buffer'.

+++
** New buffer display action alist entry 'window-min-height'.
Such an entry allows to specify a minimum height of the window used
for displaying a buffer.  'display-buffer-below-selected' is the only
action function to respect it at the moment.

+++
** New buffer display action alist entry 'direction'.
This entry is used to specify the location of the window chosen by
'display-buffer-in-direction'.

+++
** Additional meaning of display action alist entry 'window'.
A 'window' entry can now also specify a reference window for
'display-buffer-in-direction'.

+++
** The function 'assoc-delete-all' now takes an optional predicate argument.

+++
** New function 'string-distance' to calculate the Levenshtein distance
between two strings.

** 'print-quoted' now defaults to t, so if you want to see
'(quote x)' instead of 'x you will have to bind it to nil where applicable.

+++
** Numbers formatted via '%o' or '%x' are now formatted as signed integers.
This avoids problems in calls like '(read (format "#x%x" -1))', and is
more compatible with bignums.  To get the traditional machine-dependent
behavior, set the experimental variable 'binary-as-unsigned' to t,
and if the new behavior breaks your code please email
<32252@debbugs.gnu.org>.  Because '%o' and '%x' can now format signed
integers, they now support the '+' and space flags.

** To avoid confusion caused by "smart quotes", the reader signals an
error when reading Lisp symbols which begin with one of the following
quotation characters: ‘’‛“”‟〞"'.  A symbol beginning with such a
character can be written by escaping the quotation character with a
backslash.  For example:

    (read "‘smart") => (invalid-read-syntax "strange quote" "‘")
    (read "\\‘smart") == (intern "‘smart")

+++
** Omitting variables after '&optional' and '&rest' is now allowed.
For example '(defun foo (&optional))' is no longer an error.  This is
sometimes convenient when writing macros.  See the ChangeLog entry
titled "Allow '&rest' or '&optional' without following variable
(Bug#29165)" for a full listing of which arglists are accepted across
versions.

** Internal parsing commands now use 'syntax-ppss' and disregard
'open-paren-in-column-0-is-defun-start'.  This affects mostly things like
'forward-comment', 'scan-sexps', and 'forward-sexp' when parsing backward.
The new variable 'comment-use-syntax-ppss' can be set to nil to recover
the old behavior if needed.

** The 'server-name' and 'server-socket-dir' variables are set when a
socket has been passed to Emacs.

---
** The 'file-system-info' function is now available on all platforms.
instead of just Microsoft platforms.  This fixes a 'get-free-disk-space'
bug on OS X 10.8 and later.

---
** The function 'get-free-disk-space' returns now a non-nil value for
remote systems, which support this check.

+++
** 'memory-limit' now returns a better estimate of memory consumption.

+++
** New macro 'combine-change-calls' arranges to call the change hooks
('before-change-functions' and 'after-change-functions') just once
each around a sequence of lisp forms, given a region.  This is
useful when a function makes a possibly large number of repetitive
changes and the change hooks are time consuming.

+++
** 'eql', 'make-hash-table', etc. now treat NaNs consistently.
Formerly, some of these functions ignored signs and significands of
NaNs.  Now, all these functions treat NaN signs and significands as
significant.  For example, '(eql 0.0e+NaN -0.0e+NaN)' now returns nil
because the two NaNs have different signs; formerly it returned t.
Also, Emacs now reads and prints NaN significands; e.g., if X is a
NaN, '(format "%s" X)' now returns "0.0e+NaN", "1.0e+NaN", etc.,
depending on X's significand.

+++
** The function 'make-string' accepts an additional optional argument.
If the optional third argument is non-nil, 'make-string' will produce
a multibyte string even if its second argument is an ASCII character.

** '(format "%d" X)' no longer mishandles a floating-point number X that
does not fit in a machine integer.

---
** New coding-system 'ibm038'.
This is the International EBCDIC encoding, also available as aliases
'ebcdic-int' and 'cp038'.

+++
** In the DST slot, 'encode-time' and 'parse-time-string' now return -1
if it is not known whether daylight saving time is in effect.
Formerly they were inconsistent: 'encode-time' returned t in this
situation, whereas 'parse-time-string' returned nil.  Now they
consistently use use nil to mean that DST is not in effect, and use -1
to mean that it is not known whether DST is in effect.

** New JSON parsing and serialization functions 'json-serialize',
'json-insert', 'json-parse-string', and 'json-parse-buffer'.  These
are implemented in C using the Jansson library.

+++
** New function 'ring-resize'.
'ring-resize' can be used to grow or shrink a ring.

+++
** New function 'flatten-tree'.
'flatten-list' is provided as an alias. These functions take a tree
and 'flatten' it such that the result is a list of all the terminal
nodes.

+++
** 'zlib-decompress-region' can partially decompress corrupted data.
If the new optional ALLOW-PARTIAL argument is passed, then the data
that was decompressed successfully before failing will be inserted
into the buffer.

** Mailcap

---
*** The new function 'mailcap-file-name-to-mime-type' has been added.
It's a simple convenience function for looking up MIME types based on
file name extensions.

*** The default way the list of possible external viewers for MIME
types is sorted and chosen has changed.  Earlier, the most specific
viewer was chosen, even if there was a general override in "~/.mailcap".
For instance, if "/etc/mailcap" has an entry for "image/gif", that one
will be chosen even if you have an entry for "image/*" in your
"~/.mailcap" file.  But with the new method, entries from "~/.mailcap"
overrides all system and Emacs-provided defaults.  To get the old
method back, set 'mailcap-prefer-mailcap-viewers' to nil.

** URL

*** The 'file:' handler no longer looks for "index.html" in
directories if you ask it for a "file:///dir" URL.  Since this is a
low-level library, such decisions (if they are to be made at all) are
left to higher-level functions.

** Image mode

*** 'image-mode' started using ImageMagick by default for all images
some years back.  It now respects 'imagemagick-types-inhibit' as a way
to disable that.

---
*** Some 'image-mode' variables are now buffer-local.
The image parameters 'image-transform-rotation',
'image-transform-scale' and 'image-transform-resize' are now declared
buffer-local, so each buffer could have its own values for these
parameters.

+++
*** The command 'image-rotate' now accepts a prefix argument.
With a prefix argument, 'image-rotate' now rotates the image at point
90 degrees counter-clockwise, instead of the default clockwise.

** Modules

*** The function 'load' now behaves correctly when loading modules.
Specifically, it puts the module name into 'load-history', prints
loading messages if requested, and protects against recursive loads.

*** New module environment function 'process_input' to process user
input while module code is running.

*** New module environment functions 'make_time' and 'extract_time' to
convert between timespec structures and Emacs Lisp time values.

*** New module environment functions 'make_big_integer' and
'extract_big_integer' to create and extract arbitrary-size integer
values.

*** emacs-module.h now defines a macro 'EMACS_MAJOR_VERSION' that expands
to the major version of the latest Emacs supported by the header.

+++
** The function 'read-variable' now uses its own history list.
The history of variable names read by 'read-variable' is recorded in
the new variable 'custom-variable-history'.

---
** The function 'string-to-unibyte' and `string-to-multibyte' are no
longer declared obsolete.  We have found that there are legitimate use
cases for these functions, where there's no better alternative.  We
believe that the incorrect uses of these functions all but disappeared
by now, so we are un-obsoleting it.

+++
** New function 'group-name' returns a group name corresponding to GID.

+++
** 'make-process' now takes a keyword argument ':file-handler'; if
that is non-nil, it will look for a file name handler for the current
buffer's 'default-directory' and invoke that file name handler to make
the process.  That way 'make-process' can start remote processes.

+++
** Emacs now supports resizing and rotating images without ImageMagick.
All modern systems support this feature.  (On GNU and Unix systems,
Cairo drawing or the XRender extension to X11 is required for this to
be available; the configure script will test for it and, if found,
enable scaling.)

The new function 'image-transforms-p' can be used to test whether any
given frame supports these capabilities.

+++
** '(locale-info 'paper)' now returns the paper size on systems that support it.
This is currently supported on GNUish hosts and on modern versions of
MS-Windows.

+++
** The function 'regexp-opt' accepts an additional optional argument.
By default, the regexp returned by 'regexp-opt' may match the strings
in any order.  If the new third argument is non-nil, the match is
guaranteed to be performed in the order given, as if the strings were
made into a regexp by joining them with '\|'.

+++
** The function 'regexp-opt', when given an empty list of strings, now
returns a regexp that never matches anything, which is an identity for
this operation.  Previously, the empty string was returned in this
case.

** New constant 'regexp-unmatchable' contains a never-matching regexp.
It is a convenient and readable way to specify a regexp that should
not match anything, and is as fast as any such regexp can be.

++++
** New functions to handle the URL variant of base-64 encoding.
New functions 'base64url-encode-string' and 'base64url-encode-region'
implement the url-variant of base-64 encoding as defined in RFC4648.

The functions 'base64-decode-string' and 'base64-decode-region' now
accept an optional argument to decode the URL variant of base-64
encoding.

+++
** The function 'file-size-human-readable' accepts more optional arguments.
The new third argument is a string put between the number and unit; it
defaults to the empty string.  The new fourth argument is a string
representing the unit to use; it defaults to "B" when the second
argument is 'iec' and the empty string otherwise.  We recomment a
space or non-breaking space as third argument, and "B" as fourth
argument, circumstances allowing.

+++
** `format-spec' has been expanded with several modifiers to allow
greater flexibility when customizing variables.  The modifiers include
zero-padding, upper- and lower-casing, and limiting the length of the
interpolated strings.  The function has now also been documented in
the Emacs Lisp manual.

+++
** `directory-files-recursively' can now take an optional PREDICATE
parameter to control descending into subdirectories.

\f
* Changes in Emacs 27.1 on Non-Free Operating Systems

---
** Battery status is now supported in all Cygwin builds.
Previously it was supported only in the Cygwin-w32 build.

** Emacs now handles key combinations involving the macOS "command"
and "option" modifier keys more correctly.

** The special handling of 'frame-title-format' on NS where setting it
to 't' would enable the macOS proxy icon has been replaced with a
separate variable, 'ns-use-proxy-icon'.  'frame-title-format' will now
work as on other platforms.

---
** New primitive 'w32-read-registry'.
This primitive lets Lisp programs access the MS-Windows Registry by
retrieving values stored under a given key.  It is intended to be used
for supporting features such as XDG-like location of important files
and directories.

+++
** The default value of 'w32-pipe-read-delay' is now zero.
This speeds up reading output from sub-processes that produce a lot of
data.

This variable may need to be non-zero only when running DOS programs
as Emacs subprocesses, which by now is not supported on modern
versions of MS-Windows.  Set this variable to 50 if for some reason
you need the old behavior (and please report such situations to Emacs
developers).

---
** New variable 'w32-multibyte-code-page'.
This variable holds the value of the multibyte code page used by the
system.  It is usually zero, which indicates that 'w32-ansi-code-page'
is being used, except in Far Eastern locales.  When this variable is
non-zero, Emacs at startup sets 'locale-coding-system' to the
corresponding encoding, instead of using 'w32-ansi-code-page'.

+++
** On NS the behaviour of drag and drop can now be modified by use of
modifier keys in line with Apples guidelines.  This makes the drag and
drop behaviour more consistent, as previously the sending application
was able to 'set' modifiers without the knowledge of the user.

** On NS multicolor font display is enabled again since it is also
implemented in Emacs on free operating systems via Cairo drawing.

\f
----------------------------------------------------------------------
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/>.

\f
Local variables:
coding: utf-8
mode: outline
paragraph-separate: "[ 	\f]*$"
end:

debug log:

solving 00c076a18e ...
found 00c076a18e in https://yhetil.org/emacs-devel/jwvd0i0vmfj.fsf-monnier+emacs@gnu.org/
found 5378e56bca in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 5378e56bca41d992656d17e3988e90cc2f254d95	etc/NEWS

applying [1/1] https://yhetil.org/emacs-devel/jwvd0i0vmfj.fsf-monnier+emacs@gnu.org/
diff --git a/etc/NEWS b/etc/NEWS
index 5378e56bca..00c076a18e 100644

Checking patch etc/NEWS...
Applied patch etc/NEWS cleanly.

index at:
100644 00c076a18e00d9f81173c119de44faf5d15cf8fe	etc/NEWS

(*) 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 public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).