unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob c68dc71884306e87fb9c7f8ab47721f6dbc0bc57 46796 bytes (raw)
name: lisp/vc/ediff-wind.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
 
;;; ediff-wind.el --- window manipulation utilities  -*- lexical-binding:t -*-

;; Copyright (C) 1994-1997, 2000-2020 Free Software Foundation, Inc.

;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
;; Package: ediff

;; This file is part of GNU Emacs.

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

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

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

;;; Commentary:

;;; Code:


;; Compiler pacifier
(defvar icon-title-format)
(defvar top-toolbar-height)
(defvar bottom-toolbar-height)
(defvar left-toolbar-height)
(defvar right-toolbar-height)
(defvar left-toolbar-width)
(defvar right-toolbar-width)
(defvar default-menubar)
(defvar top-gutter)
(defvar frame-icon-title-format)
(defvar ediff-diff-status)

(require 'ediff-init)
(require 'ediff-help)
;; end pacifier

(defgroup ediff-window nil
  "Ediff window manipulation."
  :prefix "ediff-"
  :group 'ediff
  :group 'frames)


;; Determine which window setup function to use based on current window system.
(defun ediff-choose-window-setup-function-automatically ()
  (declare (obsolete ediff-setup-windows-default "24.3"))
  (if (ediff-window-display-p)
      #'ediff-setup-windows-multiframe
    #'ediff-setup-windows-plain))

(defcustom ediff-window-setup-function #'ediff-setup-windows-default
  "Function called to set up windows.
Ediff provides a choice of three functions:
 (1) `ediff-setup-windows-multiframe', which sets the control panel
     in a separate frame.
 (2) `ediff-setup-windows-plain', which does everything in one frame
 (3) `ediff-setup-windows-default' (the default), which does (1)
     on a graphical display and (2) on a text terminal.

The command \\[ediff-toggle-multiframe] can be used to toggle
between the multiframe display and the single frame display.  If
the multiframe function detects that one of the buffers A/B is
seen in some other frame, it will try to keep that buffer in that
frame.

If you don't like any of the two provided functions, write your own one.
The basic guidelines:
    1. It should leave the control buffer current and the control window
       selected.
    2. It should set `ediff-window-A', `ediff-window-B', `ediff-window-C',
       and `ediff-control-window' to contain window objects that display
       the corresponding buffers.
    3. It should accept the following arguments:
       buffer-A, buffer-B, buffer-C, control-buffer
       Buffer C may not be used in jobs that compare only two buffers.
If you plan to do something fancy, take a close look at how the two
provided functions are written."
  :type '(choice (const :tag "Choose Automatically" ediff-setup-windows-default)
		 (const :tag "Multi Frame" ediff-setup-windows-multiframe)
		 (const :tag "Single Frame" ediff-setup-windows-plain)
		 (function :tag "Other function"))
  :version "24.3")

;; indicates if we are in a multiframe setup
(ediff-defvar-local ediff-multiframe nil "")

;; Share of the frame occupied by the merge window (buffer C)
(ediff-defvar-local ediff-merge-window-share 0.45 "")

;; The control window.
(ediff-defvar-local ediff-control-window nil "")
;; Official window for buffer A
(ediff-defvar-local ediff-window-A nil "")
;; Official window for buffer B
(ediff-defvar-local ediff-window-B nil "")
;; Official window for buffer C
(ediff-defvar-local ediff-window-C nil "")
;; Official window for buffer Ancestor
(ediff-defvar-local ediff-window-Ancestor nil "")
;; Ediff's window configuration.
;; Used to minimize the need to rearrange windows.
(ediff-defvar-local ediff-window-config-saved "" "")

;; Association between buff-type and ediff-window-*
(defconst ediff-window-alist
  '((A . ediff-window-A)
    (?A . ediff-window-A)
    (B . ediff-window-B)
    (?B . ediff-window-B)
    (C . ediff-window-C)
    (?C . ediff-window-C)
    (Ancestor . ediff-window-Ancestor)))


(defcustom ediff-split-window-function #'split-window-vertically
  "The function used to split the main window between buffer-A and buffer-B.
You can set it to a horizontal split instead of the default vertical split
by setting this variable to `split-window-horizontally'.
You can also have your own function to do fancy splits.
This variable has no effect when buffer-A/B are shown in different frames.
In this case, Ediff will use those frames to display these buffers."
  :type '(choice
	  (const :tag "Split vertically" split-window-vertically)
	  (const :tag "Split horizontally" split-window-horizontally)
	  function))

(defcustom ediff-merge-split-window-function #'split-window-horizontally
  "The function used to split the main window between buffer-A and buffer-B.
You can set it to a vertical split instead of the default horizontal split
by setting this variable to `split-window-vertically'.
You can also have your own function to do fancy splits.
This variable has no effect when buffer-A/B/C are shown in different frames.
In this case, Ediff will use those frames to display these buffers."
  :type '(choice
	  (const :tag "Split vertically" split-window-vertically)
	  (const :tag "Split horizontally" split-window-horizontally)
	  function))

(defconst ediff-control-frame-parameters
  (list
   '(name . "Ediff")
   ;;'(unsplittable . t)
   '(minibuffer . nil)
   '(user-position . t)
   '(vertical-scroll-bars . nil)
   '(menu-bar-lines . 0)
   '(tool-bar-lines . 0)
   '(left-fringe    . 0)
   '(right-fringe   . 0)
   ;; don't lower but auto-raise
   '(auto-lower . nil)
   '(auto-raise . t)
   '(visibility . nil)
   ;; make initial frame small to avoid distraction
   '(width . 1) '(height . 1)
   ;; Fullscreen control frames don't make sense (Bug#29026).
   '(fullscreen . nil)
   ;; this blocks queries from  window manager as to where to put
   ;; ediff's control frame. we put the frame outside the display,
   ;; so the initial frame won't jump all over the screen
   (cons 'top  (if (fboundp 'display-pixel-height)
		   (1+ (display-pixel-height))
		 3000))
   (cons 'left (if (fboundp 'display-pixel-width)
		   (1+ (display-pixel-width))
		 3000))
   )
  "Frame parameters for displaying Ediff Control Panel.
Used internally---not a user option.")

;; position of the mouse; used to decide whether to warp the mouse into ctl
;; frame
(ediff-defvar-local ediff-mouse-pixel-position nil "")

;; not used for now
(defvar ediff-mouse-pixel-threshold 30
  "If the user moves mouse more than this many pixels, Ediff won't warp mouse into control window.")

(defcustom ediff-grab-mouse t
  "If t, Ediff will always grab the mouse and put it in the control frame.
If `maybe', Ediff will do it sometimes, but not after operations that require
relatively long time.  If nil, the mouse will be entirely user's
responsibility."
  :type 'boolean)

(defcustom ediff-control-frame-position-function #'ediff-make-frame-position
  "Function to call to determine the desired location for the control panel.
Expects three parameters: the control buffer, the desired width and height
of the control frame.  It returns an association list
of the form \((top . <position>) \(left . <position>))"
  :type 'function)

(defcustom ediff-control-frame-upward-shift 42
  "The upward shift of control frame from the top of buffer A's frame.
Measured in pixels.
This is used by the default control frame positioning function,
`ediff-make-frame-position'.  This variable is provided for easy
customization of the default control frame positioning."
  :type 'integer)

(defcustom ediff-narrow-control-frame-leftward-shift 3
  "The leftward shift of control frame from the right edge of buf A's frame.
Measured in characters.
This is used by the default control frame positioning function,
`ediff-make-frame-position' to adjust the position of the control frame
when it shows the short menu.  This variable is provided for easy
customization of the default."
  :type 'integer)

(defcustom ediff-wide-control-frame-rightward-shift 7
  "The rightward shift of control frame from the left edge of buf A's frame.
Measured in characters.
This is used by the default control frame positioning function,
`ediff-make-frame-position' to adjust the position of the control frame
when it shows the full menu.  This variable is provided for easy
customization of the default."
  :type 'integer)


;; Wide frame display

;; t means Ediff is using wide display
(ediff-defvar-local ediff-wide-display-p nil "")
;; keeps frame config for toggling wide display
(ediff-defvar-local ediff-wide-display-orig-parameters nil
  "Frame parameters to be restored when the user wants to toggle the wide
display off.")
(ediff-defvar-local ediff-wide-display-frame nil
  "Frame to be used for wide display.")
(ediff-defvar-local ediff-make-wide-display-function #'ediff-make-wide-display
  "The value is a function that is called to create a wide display.
The function is called without arguments.  It should resize the frame in
which buffers A, B, and C are to be displayed, and it should save the old
frame parameters in `ediff-wide-display-orig-parameters'.
The variable `ediff-wide-display-frame' should be set to contain
the frame used for the wide display.")

;; Frame used for the control panel in a windowing system.
(ediff-defvar-local ediff-control-frame nil "")

(defcustom ediff-prefer-iconified-control-frame nil
  "If t, keep control panel iconified when help message is off.
This has effect only on a windowing system.
If t, hitting `?' to toggle control panel off iconifies it.

This is only useful for certain kinds of window managers, such as
TWM and its derivatives, since the window manager must permit
keyboard input to go into icons."
  :type 'boolean)

;;; Functions

(defun ediff-get-window-by-clicking (_wind _prev-wind wind-number)
  (let (event)
    (message
     "Select windows by clicking.  Please click on Window %d " wind-number)
    (while (not (ediff-mouse-event-p (setq event (read-event))))
      (if (sit-for 1) ; if sequence of events, wait till the final word
	  (beep 1))
      (message "Please click on Window %d " wind-number))
    (read-event) ; discard event
    (posn-window (event-start event))))


;; Select the lowest window on the frame.
(defun ediff-select-lowest-window ()
  (let* ((lowest-window (selected-window))
	 (bottom-edge (car (cdr (cdr (cdr (window-edges))))))
	 (last-window (save-excursion
			(other-window -1) (selected-window)))
	 (window-search t))
    (while window-search
      (let* ((this-window (next-window))
	     (next-bottom-edge
	      (car (cdr (cdr (cdr (window-edges this-window)))))))
	(if (< bottom-edge next-bottom-edge)
	    (setq bottom-edge next-bottom-edge
		  lowest-window this-window))
	(select-window this-window)
	(when (eq last-window this-window)
	  (select-window lowest-window)
	  (setq window-search nil))))))


;;; Common window setup routines

;; Set up the window configuration.  If POS is given, set the points to
;; the beginnings of the buffers.
;; When 3way comparison is added, this will have to choose the appropriate
;; setup function based on ediff-job-name
(defun ediff-setup-windows (buffer-A buffer-B buffer-C control-buffer)
  ;; Make sure we are not in the minibuffer window when we try to delete
  ;; all other windows.
  (run-hooks 'ediff-before-setup-windows-hook)
  (if (eq (selected-window) (minibuffer-window))
      (other-window 1))

  ;; in case user did a no-no on a tty
  (or (ediff-window-display-p)
      (setq ediff-window-setup-function #'ediff-setup-windows-plain))

  (or (ediff-keep-window-config control-buffer)
      (funcall
       (with-current-buffer control-buffer ediff-window-setup-function)
       buffer-A buffer-B buffer-C control-buffer))
  (run-hooks 'ediff-after-setup-windows-hook))

(defun ediff-setup-windows-default (buffer-A buffer-B buffer-C control-buffer)
  (funcall (if (display-graphic-p)
	       #'ediff-setup-windows-multiframe
	     #'ediff-setup-windows-plain)
	   buffer-A buffer-B buffer-C control-buffer))

;; Just set up 3 windows.
;; Usually used without windowing systems
;; With windowing, we want to use dedicated frames.
(defun ediff-setup-windows-plain (buffer-A buffer-B buffer-C control-buffer)
  (with-current-buffer control-buffer
    (setq ediff-multiframe nil))
  (if ediff-merge-job
      (ediff-setup-windows-plain-merge
       buffer-A buffer-B buffer-C control-buffer)
    (ediff-setup-windows-plain-compare
     buffer-A buffer-B buffer-C control-buffer)))

(autoload 'ediff-setup-control-buffer "ediff-util")

(defun ediff-setup-windows-plain-merge (buf-A buf-B buf-C control-buffer)
  ;; skip dedicated and unsplittable frames
  (ediff-destroy-control-frame control-buffer)
  (let ((window-min-height 1)
	(with-Ancestor-p (with-current-buffer control-buffer
                           ediff-merge-with-ancestor-job))
	split-window-function
	merge-window-share merge-window-lines
	(buf-Ancestor (with-current-buffer control-buffer
                        ediff-ancestor-buffer))
	wind-A wind-B wind-C wind-Ancestor)
    (with-current-buffer control-buffer
      (setq merge-window-share ediff-merge-window-share
	    ;; this lets us have local versions of ediff-split-window-function
	    split-window-function ediff-split-window-function))
    (delete-other-windows)
    (set-window-dedicated-p (selected-window) nil)
    (split-window-vertically)
    (ediff-select-lowest-window)
    (ediff-setup-control-buffer control-buffer)

    ;; go to the upper window and split it betw A, B, and possibly C
    (other-window 1)
    (setq merge-window-lines
	  (max 2 (round (* (window-height) merge-window-share))))
    (switch-to-buffer buf-A)
    (setq wind-A (selected-window))

    (split-window-vertically (max 2 (- (window-height) merge-window-lines)))
    (if (eq (selected-window) wind-A)
	(other-window 1))
    (setq wind-C (selected-window))
    (switch-to-buffer buf-C)

    (when (and ediff-show-ancestor with-Ancestor-p)
      (select-window wind-C)
      (funcall split-window-function)
      (when (eq (selected-window) wind-C)
        (other-window 1))
      (switch-to-buffer buf-Ancestor)
      (setq wind-Ancestor (selected-window)))

    (select-window wind-A)
    (funcall split-window-function)

    (if (eq (selected-window) wind-A)
	(other-window 1))
    (switch-to-buffer buf-B)
    (setq wind-B (selected-window))

    (with-current-buffer control-buffer
      (setq ediff-window-A wind-A
	    ediff-window-B wind-B
	    ediff-window-C wind-C
            ediff-window-Ancestor wind-Ancestor))

    (ediff-select-lowest-window)
    (ediff-setup-control-buffer control-buffer)
    ))


;; This function handles all comparison jobs, including 3way jobs
(defun ediff-setup-windows-plain-compare (buf-A buf-B buf-C control-buffer)
  ;; skip dedicated and unsplittable frames
  (ediff-destroy-control-frame control-buffer)
  (let ((window-min-height 1)
	split-window-function wind-width-or-height
	three-way-comparison
	wind-A-start wind-B-start wind-A wind-B wind-C)
    (with-current-buffer control-buffer
      (setq wind-A-start (ediff-overlay-start
			  (ediff-get-value-according-to-buffer-type
			   'A ediff-narrow-bounds))
	    wind-B-start (ediff-overlay-start
			  (ediff-get-value-according-to-buffer-type
			   'B  ediff-narrow-bounds))
	    ;; this lets us have local versions of ediff-split-window-function
	    split-window-function ediff-split-window-function
	    three-way-comparison ediff-3way-comparison-job))
    ;; if in minibuffer go somewhere else
    (if (save-match-data
	  (string-match "\\*Minibuf-" (buffer-name (window-buffer))))
	(select-window (next-window nil 'ignore-minibuf)))
    (delete-other-windows)
    (set-window-dedicated-p (selected-window) nil)
    (split-window-vertically)
    (ediff-select-lowest-window)
    (ediff-setup-control-buffer control-buffer)

    ;; go to the upper window and split it betw A, B, and possibly C
    (other-window 1)
    (switch-to-buffer buf-A)
    (setq wind-A (selected-window))
    (if three-way-comparison
	(setq wind-width-or-height
	      (/ (if (eq split-window-function #'split-window-vertically)
		     (window-height wind-A)
		   (window-width wind-A))
		 3)))

    (funcall split-window-function wind-width-or-height)

    (if (eq (selected-window) wind-A)
	(other-window 1))
    (switch-to-buffer buf-B)
    (setq wind-B (selected-window))

    (if three-way-comparison
	(progn
	  (funcall split-window-function) ; equally
	  (if (eq (selected-window) wind-B)
	      (other-window 1))
	  (switch-to-buffer buf-C)
	  (setq wind-C (selected-window))))

    (with-current-buffer control-buffer
      (setq ediff-window-A wind-A
	    ediff-window-B wind-B
	    ediff-window-C wind-C))

    ;; It is unlikely that we will want to implement 3way window comparison.
    ;; So, only buffers A and B are used here.
    (if ediff-windows-job
	(progn
	  (set-window-start wind-A wind-A-start)
	  (set-window-start wind-B wind-B-start)))

    (ediff-select-lowest-window)
    (ediff-setup-control-buffer control-buffer)
    ))


;; dispatch an appropriate window setup function
(defun ediff-setup-windows-multiframe (buf-A buf-B buf-C control-buf)
  (with-current-buffer control-buf
    (setq ediff-multiframe t))
  (if ediff-merge-job
      (ediff-setup-windows-multiframe-merge buf-A buf-B buf-C control-buf)
    (ediff-setup-windows-multiframe-compare buf-A buf-B buf-C control-buf)))

(defun ediff-setup-windows-multiframe-merge (buf-A buf-B buf-C control-buf)
  ;; Algorithm:
  ;;   1. Never use frames that have dedicated windows in them---it is bad to
  ;;      destroy dedicated windows.
  ;;   2. If A and B are in the same frame but C's frame is different--- use one
  ;;      frame for A and B and use a separate frame for C.
  ;;   3. If C's frame is non-existent, then: if the first suitable
  ;;      non-dedicated frame  is different from A&B's, then use it for C.
  ;;      Otherwise, put A,B, and C in one frame.
  ;;   4. If buffers A, B, C are is separate frames, use them to display these
  ;;      buffers.

  ;;   Skip dedicated or iconified frames.
  ;;   Unsplittable frames are taken care of later.
  ;; (ediff-skip-unsuitable-frames 'ok-unsplittable)

  (let* ((window-min-height 1)
	 (wind-A (ediff-get-visible-buffer-window buf-A))
	 (wind-B (ediff-get-visible-buffer-window buf-B))
	 (wind-C (ediff-get-visible-buffer-window buf-C))
	 (buf-Ancestor (with-current-buffer control-buf
                         ediff-ancestor-buffer))
	 (wind-Ancestor (ediff-get-visible-buffer-window buf-Ancestor))
	 (frame-A (if wind-A (window-frame wind-A)))
	 (frame-B (if wind-B (window-frame wind-B)))
	 (frame-C (if wind-C (window-frame wind-C)))
	 (frame-Ancestor (if wind-Ancestor (window-frame wind-Ancestor)))
	 ;; on wide display, do things in one frame
	 (force-one-frame
	  (with-current-buffer control-buf ediff-wide-display-p))
	 ;; this lets us have local versions of ediff-split-window-function
	 (split-window-function
	  (with-current-buffer control-buf ediff-split-window-function))
	 (orig-wind (selected-window))
	 (orig-frame (selected-frame))
	 (use-same-frame (or force-one-frame
			     ;; A and C must be in one frame
			     (eq frame-A (or frame-C orig-frame))
			     ;; B and C must be in one frame
			     (eq frame-B (or frame-C orig-frame))
			     ;; A or B is not visible
			     (not (frame-live-p frame-A))
			     (not (frame-live-p frame-B))
			     ;; A or B is not suitable for display
			     (not (ediff-window-ok-for-display wind-A))
			     (not (ediff-window-ok-for-display wind-B))
			     ;; A and B in the same frame, and no good frame
			     ;; for C
			     (and (eq frame-A frame-B)
				  (not (frame-live-p frame-C)))
			     ))
	 ;; use-same-frame-for-AB implies wind A and B are ok for display
	 (use-same-frame-for-AB (and (not use-same-frame)
				     (eq frame-A frame-B)))
	 (merge-window-share (with-current-buffer control-buf
			       ediff-merge-window-share))
	 merge-window-lines
	 designated-minibuffer-frame ; ediff-merge-with-ancestor-job
     (with-Ancestor-p (with-current-buffer control-buf
                        ediff-merge-with-ancestor-job))
     (done-Ancestor (not with-Ancestor-p))
	 done-A done-B done-C)

    ;; buf-A on its own
    (if (and (window-live-p wind-A)
	     (null use-same-frame) ; implies wind-A is suitable
	     (null use-same-frame-for-AB))
	(progn ; buf A on its own
	  ;; buffer buf-A is seen in live wind-A
	  (select-window wind-A)
	  (delete-other-windows)
	  (setq wind-A (selected-window))
	  (setq done-A t)))

    ;; buf-B on its own
    (if (and (window-live-p wind-B)
	     (null use-same-frame) ; implies wind-B is suitable
	     (null use-same-frame-for-AB))
	(progn ; buf B on its own
	  ;; buffer buf-B is seen in live wind-B
	  (select-window wind-B)
	  (delete-other-windows)
	  (setq wind-B (selected-window))
	  (setq done-B t)))

    ;; buf-C on its own
    (if (and (window-live-p wind-C)
	     (ediff-window-ok-for-display wind-C)
	     (null use-same-frame)) ; buf C on its own
	(progn
	  ;; buffer buf-C is seen in live wind-C
	  (select-window wind-C)
	  (delete-other-windows)
	  (setq wind-C (selected-window))
	  (setq done-C t)))

    ;; buf-Ancestor on its own
    (if (and ediff-show-ancestor
             with-Ancestor-p
             (window-live-p wind-Ancestor)
             (ediff-window-ok-for-display wind-Ancestor)
             (null use-same-frame)) ; buf Ancestor on its own
        (progn
          ;; buffer buf-Ancestor is seen in live wind-Ancestor
          (select-window wind-Ancestor)
          (delete-other-windows)
          (setq wind-Ancestor (selected-window))
          (setq done-Ancestor t)))

    (if (and use-same-frame-for-AB  ; implies wind A and B are suitable
	     (window-live-p wind-A))
	(progn
	  ;; wind-A must already be displaying buf-A
	  (select-window wind-A)
	  (delete-other-windows)
	  (setq wind-A (selected-window))

	  (funcall split-window-function)
	  (if (eq (selected-window) wind-A)
	      (other-window 1))
	  (switch-to-buffer buf-B)
	  (setq wind-B (selected-window))

	  (setq done-A t
		done-B t)))

    (if use-same-frame
	(let ((window-min-height 1))
	  (if (and (eq frame-A frame-B)
		   (eq frame-B frame-C)
		   (eq frame-C frame-Ancestor)
		   (frame-live-p frame-A))
	      (select-frame frame-A)
	    ;; avoid dedicated and non-splittable windows
	    (ediff-skip-unsuitable-frames))
	  (delete-other-windows)
	  (setq merge-window-lines
		(max 2 (round (* (window-height) merge-window-share))))
	  (switch-to-buffer buf-A)
	  (setq wind-A (selected-window))

	  (split-window-vertically
	   (max 2 (- (window-height) merge-window-lines)))
	  (if (eq (selected-window) wind-A)
	      (other-window 1))
	  (setq wind-C (selected-window))
	  (switch-to-buffer buf-C)

      (when (and ediff-show-ancestor with-Ancestor-p)
        (select-window wind-C)
        (funcall split-window-function)
        (if (eq (selected-window) wind-C)
            (other-window 1))
        (switch-to-buffer buf-Ancestor)
        (setq wind-Ancestor (selected-window)))

	  (select-window wind-A)

	  (funcall split-window-function)
	  (if (eq (selected-window) wind-A)
	      (other-window 1))
	  (switch-to-buffer buf-B)
	  (setq wind-B (selected-window))

	  (setq done-A t
		done-B t
		done-C t
        done-Ancestor t)))

    (or done-A  ; Buf A to be set in its own frame,
	      ;;; or it was set before because use-same-frame = 1
	(progn
	  ;; Buf-A was not set up yet as it wasn't visible,
	  ;; and use-same-frame = nil, use-same-frame-for-AB = nil
	  (select-window orig-wind)
	  (delete-other-windows)
	  (switch-to-buffer buf-A)
	  (setq wind-A (selected-window))
	  ))
    (or done-B  ; Buf B to be set in its own frame,
	      ;;; or it was set before because use-same-frame = 1
	(progn
	  ;; Buf-B was not set up yet as it wasn't visible
	  ;; and use-same-frame = nil, use-same-frame-for-AB = nil
	  (select-window orig-wind)
	  (delete-other-windows)
	  (switch-to-buffer buf-B)
	  (setq wind-B (selected-window))
	  ))

    (or done-C  ; Buf C to be set in its own frame,
	      ;;; or it was set before because use-same-frame = 1
	(progn
	  ;; Buf-C was not set up yet as it wasn't visible
	  ;; and use-same-frame = nil
	  (select-window orig-wind)
	  (delete-other-windows)
	  (switch-to-buffer buf-C)
	  (setq wind-C (selected-window))
	  ))

    (or done-Ancestor  ; Buf Ancestor to be set in its own frame,
        (not ediff-show-ancestor)
	      ;;; or it was set before because use-same-frame = 1
        (progn
          ;; Buf-Ancestor was not set up yet as it wasn't visible
          ;; and use-same-frame = nil
          (select-window orig-wind)
          (delete-other-windows)
          (switch-to-buffer buf-Ancestor)
          (setq wind-Ancestor (selected-window))))

    (with-current-buffer control-buf
      (setq ediff-window-A wind-A
	    ediff-window-B wind-B
	    ediff-window-C wind-C
            ediff-window-Ancestor wind-Ancestor)
      (setq frame-A (window-frame ediff-window-A)
	    designated-minibuffer-frame
	    (window-frame (minibuffer-window frame-A))))

    (ediff-setup-control-frame control-buf designated-minibuffer-frame)
    ))

;; Window setup for all comparison jobs, including 3way comparisons
(defun ediff-setup-windows-multiframe-compare (buf-A buf-B buf-C control-buf)
  ;; Algorithm:
  ;;    If a buffer is seen in a frame, use that frame for that buffer.
  ;;    If it is not seen, use the current frame.
  ;;    If both buffers are not seen, they share the current frame.  If one
  ;;    of the buffers is not seen, it is placed in the current frame (where
  ;;    ediff started).  If that frame is displaying the other buffer, it is
  ;;    shared between the two buffers.
  ;;    However, if we decide to put both buffers in one frame
  ;;    and the selected frame isn't splittable, we create a new frame and
  ;;    put both buffers there, event if one of this buffers is visible in
  ;;    another frame.

  (let* ((window-min-height 1)
	 (wind-A (ediff-get-visible-buffer-window buf-A))
	 (wind-B (ediff-get-visible-buffer-window buf-B))
	 (wind-C (ediff-get-visible-buffer-window buf-C))
	 (frame-A (if wind-A (window-frame wind-A)))
	 (frame-B (if wind-B (window-frame wind-B)))
	 (frame-C (if wind-C (window-frame wind-C)))
	 (ctl-frame-exists-p (with-current-buffer control-buf
			       (frame-live-p ediff-control-frame)))
	 ;; on wide display, do things in one frame
	 (force-one-frame
	  (with-current-buffer control-buf ediff-wide-display-p))
	 ;; this lets us have local versions of ediff-split-window-function
	 (split-window-function
	  (with-current-buffer control-buf ediff-split-window-function))
	 (three-way-comparison
	  (with-current-buffer control-buf ediff-3way-comparison-job))
	 (use-same-frame (or force-one-frame
			     (eq frame-A frame-B)
			     (not (ediff-window-ok-for-display wind-A))
			     (not (ediff-window-ok-for-display wind-B))
			     (if three-way-comparison
				 (or (eq frame-A frame-C)
				     (eq frame-B frame-C)
				     (not (ediff-window-ok-for-display wind-C))
				     (not (frame-live-p frame-A))
				     (not (frame-live-p frame-B))
				     (not (frame-live-p frame-C))))
			     (and (not (frame-live-p frame-B))
				  (or ctl-frame-exists-p
				      (eq frame-A (selected-frame))))
			     (and (not (frame-live-p frame-A))
				  (or ctl-frame-exists-p
				      (eq frame-B (selected-frame))))))
	 wind-A-start wind-B-start
	 designated-minibuffer-frame)

    (with-current-buffer control-buf
      (setq wind-A-start (ediff-overlay-start
			  (ediff-get-value-according-to-buffer-type
			   'A ediff-narrow-bounds))
	    wind-B-start (ediff-overlay-start
			  (ediff-get-value-according-to-buffer-type
			   'B ediff-narrow-bounds))))

    (if use-same-frame
	(let (wind-width-or-height) ; this affects 3way setups only
	  (if (and (eq frame-A frame-B) (frame-live-p frame-A))
	      (select-frame frame-A)
	    ;; avoid dedicated and non-splittable windows
	    (ediff-skip-unsuitable-frames))
	  (delete-other-windows)
	  (switch-to-buffer buf-A)
	  (setq wind-A (selected-window))

	  (if three-way-comparison
	      (setq wind-width-or-height
		    (/
		     (if (eq split-window-function #'split-window-vertically)
			 (window-height wind-A)
		       (window-width wind-A))
		     3)))

	  (funcall split-window-function wind-width-or-height)
	  (if (eq (selected-window) wind-A)
	      (other-window 1))
	  (switch-to-buffer buf-B)
	  (setq wind-B (selected-window))

	  (if three-way-comparison
	      (progn
		(funcall split-window-function) ; equally
		(if (memq (selected-window) (list wind-A wind-B))
		    (other-window 1))
		(switch-to-buffer buf-C)
		(setq wind-C (selected-window)))))

      (if (window-live-p wind-A)        ; buf-A on its own
	  (progn
	    ;; buffer buf-A is seen in live wind-A
	    (select-window wind-A)      ; must be displaying buf-A
	    (delete-other-windows)
	    (setq wind-A (selected-window))) ;FIXME: Why?
	;; Buf-A was not set up yet as it wasn't visible,
	;; and use-same-frame = nil
        ;; Skip dedicated or iconified frames.
        ;; Unsplittable frames are taken care of later.
        (ediff-skip-unsuitable-frames 'ok-unsplittable)
	(delete-other-windows)
	(switch-to-buffer buf-A)
	(setq wind-A (selected-window)))

      (if (window-live-p wind-B)        ; buf B on its own
	  (progn
	    ;; buffer buf-B is seen in live wind-B
	    (select-window wind-B)      ; must be displaying buf-B
	    (delete-other-windows)
	    (setq wind-B (selected-window))) ;FIXME: Why?
	;; Buf-B was not set up yet as it wasn't visible,
	;; and use-same-frame = nil
        ;; Skip dedicated or iconified frames.
        ;; Unsplittable frames are taken care of later.
        (ediff-skip-unsuitable-frames 'ok-unsplittable)
	(delete-other-windows)
	(switch-to-buffer buf-B)
	(setq wind-B (selected-window)))

      (if (window-live-p wind-C)        ; buf C on its own
	  (progn
	    ;; buffer buf-C is seen in live wind-C
	    (select-window wind-C)      ; must be displaying buf-C
	    (delete-other-windows)
	    (setq wind-C (selected-window))) ;FIXME: Why?
        (if three-way-comparison
	    (progn
	      ;; Buf-C was not set up yet as it wasn't visible,
	      ;; and use-same-frame = nil
              ;; Skip dedicated or iconified frames.
              ;; Unsplittable frames are taken care of later.
              (ediff-skip-unsuitable-frames 'ok-unsplittable)
	      (delete-other-windows)
	      (switch-to-buffer buf-C)
	      (setq wind-C (selected-window))
	      ))))

    (with-current-buffer control-buf
      (setq ediff-window-A wind-A
	    ediff-window-B wind-B
	    ediff-window-C wind-C)

      (setq frame-A (window-frame ediff-window-A)
	    designated-minibuffer-frame
	    (window-frame (minibuffer-window frame-A))))

    ;; It is unlikely that we'll implement a version of ediff-windows that
    ;; would compare 3 windows at once.  So, we don't use buffer C here.
    (if ediff-windows-job
	(progn
	  (set-window-start wind-A wind-A-start)
	  (set-window-start wind-B wind-B-start)))

    (ediff-setup-control-frame control-buf designated-minibuffer-frame)
    ))

(defun ediff-skip-unsuitable-frames (&optional ok-unsplittable)
  "Skip unsplittable frames and frames that have dedicated windows.
create a new splittable frame if none is found."
  (if (ediff-window-display-p)
      (let ((wind-frame (window-frame))
	     seen-windows)
	(while (and (not (memq (selected-window) seen-windows))
		    (or
		     (ediff-frame-has-dedicated-windows wind-frame)
		     (ediff-frame-iconified-p wind-frame)
		     ;; skip small windows
		     (< (frame-height wind-frame)
			(* 3 window-min-height))
		     (if ok-unsplittable
			 nil
		       (ediff-frame-unsplittable-p wind-frame))))
	  ;; remember history
	  (setq seen-windows (cons (selected-window) seen-windows))
	  ;; try new window
	  (other-window 1 t)
	  (setq wind-frame (window-frame))
	  )
	(if (memq (selected-window) seen-windows)
	    ;; fed up, no appropriate frames
	    (setq wind-frame (make-frame '((unsplittable)))))

	(select-frame wind-frame)
	)))

(defun ediff-frame-has-dedicated-windows (frame)
  (let (ans)
    (walk-windows
     (lambda (wind) (if (window-dedicated-p wind)
			(setq ans t)))
     'ignore-minibuffer
     frame)
    ans))

;; window is ok, if it is only one window on the frame, not counting the
;; minibuffer, or none of the frame's windows is dedicated.
;; The idea is that it is bad to destroy dedicated windows while creating an
;; ediff window setup
(defun ediff-window-ok-for-display (wind)
  (and
   (window-live-p wind)
   (or
    ;; only one window
    (eq wind (next-window wind 'ignore-minibuffer (window-frame wind)))
    ;; none is dedicated (in multiframe setup)
    (not (ediff-frame-has-dedicated-windows (window-frame wind)))
    )))

;; Prepare or refresh control frame
(defun ediff-setup-control-frame (ctl-buffer designated-minibuffer-frame)
  (let ((window-min-height 1)
	ctl-frame-iconified-p dont-iconify-ctl-frame deiconify-ctl-frame
	ctl-frame old-ctl-frame lines
	;; user-grabbed-mouse
	fheight fwidth adjusted-parameters)

    (with-current-buffer ctl-buffer
      ;;(setq user-grabbed-mouse (ediff-user-grabbed-mouse))
      (run-hooks 'ediff-before-setup-control-frame-hook))

    (setq old-ctl-frame (with-current-buffer ctl-buffer ediff-control-frame))
    (with-current-buffer ctl-buffer
      (setq ctl-frame (if (frame-live-p old-ctl-frame)
			  old-ctl-frame
			(make-frame ediff-control-frame-parameters))
	    ediff-control-frame ctl-frame)
      ;; protect against undefined face-attribute
      (condition-case nil
	  (if (face-attribute 'mode-line :box)
	      (set-face-attribute 'mode-line ctl-frame :box nil))
	(error)))

    (setq ctl-frame-iconified-p (ediff-frame-iconified-p ctl-frame))
    (select-frame ctl-frame)
    (if (window-dedicated-p)
	()
      (delete-other-windows)
      (switch-to-buffer ctl-buffer))

    ;; must be before ediff-setup-control-buffer
    ;; just a precaution--we should be in ctl-buffer already
    (with-current-buffer ctl-buffer
      (make-local-variable 'frame-title-format)
      (make-local-variable 'icon-title-format))

    (ediff-setup-control-buffer ctl-buffer)
    (setq dont-iconify-ctl-frame
	  (not (string= ediff-help-message ediff-brief-help-message)))
    (setq deiconify-ctl-frame
	  (and (eq this-command 'ediff-toggle-help)
	       dont-iconify-ctl-frame))

    ;; 1 more line for the mode line
    (setq lines (1+ (count-lines (point-min) (point-max)))
	  fheight lines
          fwidth (max (+ (ediff-help-message-line-length) 2) 0)
	  adjusted-parameters
	  (list
	   ;; possibly change surrogate minibuffer
	   (cons 'minibuffer
		 (minibuffer-window
		  designated-minibuffer-frame))
	   (cons 'width fwidth)
	   (cons 'height fheight)
	   (cons 'user-position t)
	   ))

    ;; adjust autoraise
    (setq adjusted-parameters
	  (cons (if ediff-use-long-help-message
		    '(auto-raise . nil)
		  '(auto-raise . t))
		adjusted-parameters))

    ;; As a precaution, we call modify frame parameters twice, in
    ;; order to make sure that at least once we do it for
    ;; a non-iconified frame.  (It appears that in the Windows port of
    ;; Emacs, one can't modify frame parameters of iconified frames.)
    (if (eq system-type 'windows-nt)
	(modify-frame-parameters ctl-frame adjusted-parameters))

    (goto-char (point-min))

    (modify-frame-parameters ctl-frame adjusted-parameters)
    (make-frame-visible ctl-frame)

    ;; This works around a bug in 19.25 and earlier.  There, if frame gets
    ;; iconified, the current buffer changes to that of the frame that
    ;; becomes exposed as a result of this iconification.
    ;; So, we make sure the current buffer doesn't change.
    (select-frame ctl-frame)
    (ediff-refresh-control-frame)

    (cond ((and ediff-prefer-iconified-control-frame
		(not ctl-frame-iconified-p) (not dont-iconify-ctl-frame))
	   (iconify-frame ctl-frame))
	  ((or deiconify-ctl-frame (not ctl-frame-iconified-p))
	   (raise-frame ctl-frame)))

    (set-window-dedicated-p (selected-window) t)

    ;; Now move the frame.  We must do it separately due to an obscure bug in
    ;; XEmacs
    (modify-frame-parameters
     ctl-frame
     (funcall ediff-control-frame-position-function ctl-buffer fwidth fheight))

    ;; synchronize so the cursor will move to control frame
    ;; per RMS suggestion
    (if (ediff-window-display-p)
	(let ((count 7))
	  (sit-for .1)
	  (while (and (not (frame-visible-p ctl-frame)) (> count 0))
	    (setq count (1- count))
	    (sit-for .3))))

    (or (ediff-frame-iconified-p ctl-frame)
	;; don't warp the mouse, unless ediff-grab-mouse = t
	(ediff-reset-mouse ctl-frame
			   (or (eq this-command 'ediff-quit)
			       (not (eq ediff-grab-mouse t)))))

    (with-current-buffer ctl-buffer
      (run-hooks 'ediff-after-setup-control-frame-hook))))


(defun ediff-destroy-control-frame (ctl-buffer)
  (ediff-with-current-buffer ctl-buffer
    (if (and (ediff-window-display-p) (frame-live-p ediff-control-frame))
	(let ((ctl-frame ediff-control-frame))
	  (setq ediff-control-frame nil)
	  (delete-frame ctl-frame))))
  (if ediff-multiframe
      (ediff-skip-unsuitable-frames))
  ;;(ediff-reset-mouse nil)
  )


;; finds a good place to clip control frame
(defun ediff-make-frame-position (ctl-buffer ctl-frame-width ctl-frame-height)
  (with-current-buffer ctl-buffer
    (let* ((frame-A (window-frame ediff-window-A))
	   (frame-A-parameters (frame-parameters frame-A))
	   (frame-A-top (eval (cdr (assoc 'top frame-A-parameters))))
	   (frame-A-left (eval (cdr (assoc 'left frame-A-parameters))))
	   (frame-A-width (frame-width frame-A))
	   (ctl-frame ediff-control-frame)
	   horizontal-adjustment upward-adjustment
	   ctl-frame-top ctl-frame-left)

      ;; Multiple control frames are clipped based on the value of
      ;; ediff-control-buffer-number.  This is done in order not to obscure
      ;; other active control panels.
      (setq horizontal-adjustment (* 2 ediff-control-buffer-number)
	    upward-adjustment (* -14 ediff-control-buffer-number))

      (setq ctl-frame-top
	    (- frame-A-top upward-adjustment ediff-control-frame-upward-shift)
	    ctl-frame-left
	    (+ frame-A-left
	       (if ediff-use-long-help-message
		   (* (frame-char-width ctl-frame)
		      (+ ediff-wide-control-frame-rightward-shift
			 horizontal-adjustment))
		 (- (* frame-A-width (frame-char-width frame-A))
		    (* (frame-char-width ctl-frame)
		       (+ ctl-frame-width
			  ediff-narrow-control-frame-leftward-shift
			  horizontal-adjustment))))))
      (setq ctl-frame-top
	    (min ctl-frame-top
		 (- (display-pixel-height)
		    (* 2 ctl-frame-height
		       (frame-char-height ctl-frame))))
	    ctl-frame-left
	    (min ctl-frame-left
		 (- (display-pixel-width)
		    (* ctl-frame-width (frame-char-width ctl-frame)))))
      ;; keep ctl frame within the visible bounds
      (setq ctl-frame-top (max ctl-frame-top 1)
	    ctl-frame-left (max ctl-frame-left 1))

      (list (cons 'top ctl-frame-top)
	    (cons 'left ctl-frame-left))
      )))

(defun ediff-xemacs-select-frame-hook ()
  (declare (obsolete nil "28.1"))
  (if (and (equal (selected-frame) ediff-control-frame)
	   (not ediff-use-long-help-message))
      (raise-frame ediff-control-frame)))

(defun ediff-make-wide-display ()
  "Construct an alist of parameters for the wide display.
Saves the old frame parameters in `ediff-wide-display-orig-parameters'.
The frame to be resized is kept in `ediff-wide-display-frame'.
This function modifies only the left margin and the width of the display.
It assumes that it is called from within the control buffer."
  (if (not (fboundp 'display-pixel-width))
      (user-error "Can't determine display width"))
  (let* ((frame-A (window-frame ediff-window-A))
	 (frame-A-params (frame-parameters frame-A))
	 (cw (frame-char-width frame-A))
	 (wd (- (/ (display-pixel-width) cw) 5)))
    (setq ediff-wide-display-orig-parameters
	  (list (cons 'left (max 0 (eval (cdr (assoc 'left frame-A-params)))))
		(cons 'width (cdr (assoc 'width frame-A-params))))
	  ediff-wide-display-frame frame-A)
    (modify-frame-parameters
     frame-A `((left . ,cw) (width . ,wd) (user-position . t)))))


;; Revise the mode line to display which difference we have selected
;; Also resets mode lines of buffers A/B, since they may be clobbered by
;; other invocations of Ediff.
(defun ediff-refresh-mode-lines ()
  (let (buf-A-state-diff buf-B-state-diff buf-C-state-diff buf-C-state-merge)

    (if (ediff-valid-difference-p)
	(setq
	 buf-C-state-diff (ediff-get-state-of-diff ediff-current-difference 'C)
	 buf-C-state-merge (ediff-get-state-of-merge ediff-current-difference)
	 buf-A-state-diff (ediff-get-state-of-diff ediff-current-difference 'A)
	 buf-B-state-diff (ediff-get-state-of-diff ediff-current-difference 'B)
	 buf-A-state-diff (if buf-A-state-diff
			      (format "[%s] " buf-A-state-diff)
			    "")
	 buf-B-state-diff (if buf-B-state-diff
			      (format "[%s] " buf-B-state-diff)
			    "")
	 buf-C-state-diff (if (and (ediff-buffer-live-p ediff-buffer-C)
				   (or buf-C-state-diff buf-C-state-merge))
			      (format "[%s%s%s] "
				      (or buf-C-state-diff "")
				      (if buf-C-state-merge
					  (concat " " buf-C-state-merge)
					"")
				      (if (ediff-get-state-of-ancestor
					   ediff-current-difference)
					  " AncestorEmpty"
					"")
				      )
			    ""))
      (setq buf-A-state-diff ""
	    buf-B-state-diff ""
	    buf-C-state-diff ""))

    ;; control buffer format
    (setq mode-line-format
	  (if (ediff-narrow-control-frame-p)
	      (list "   " mode-line-buffer-identification)
	    (list "-- " mode-line-buffer-identification "        Quick Help")))
    ;; control buffer id
    (setq mode-line-buffer-identification
	  (if (ediff-narrow-control-frame-p)
	      (ediff-make-narrow-control-buffer-id 'skip-name)
	    (ediff-make-wide-control-buffer-id)))
    ;; Force mode-line redisplay
    (force-mode-line-update)

    (if (and (ediff-window-display-p) (frame-live-p ediff-control-frame))
	(ediff-refresh-control-frame))

    (ediff-with-current-buffer ediff-buffer-A
      (setq ediff-diff-status buf-A-state-diff)
      (ediff-strip-mode-line-format)
      (setq mode-line-format
	    (list " A: " 'ediff-diff-status mode-line-format))
      (force-mode-line-update))
    (ediff-with-current-buffer ediff-buffer-B
      (setq ediff-diff-status buf-B-state-diff)
      (ediff-strip-mode-line-format)
      (setq mode-line-format
	    (list " B: " 'ediff-diff-status mode-line-format))
      (force-mode-line-update))
    (if ediff-3way-job
	(ediff-with-current-buffer ediff-buffer-C
	  (setq ediff-diff-status buf-C-state-diff)
	  (ediff-strip-mode-line-format)
	  (setq mode-line-format
		(list " C: " 'ediff-diff-status mode-line-format))
	  (force-mode-line-update)))
    (if (ediff-buffer-live-p ediff-ancestor-buffer)
	(ediff-with-current-buffer ediff-ancestor-buffer
	  (ediff-strip-mode-line-format)
	  ;; we keep the second dummy string in the mode line format of the
	  ;; ancestor, since for other buffers Ediff prepends 2 strings and
	  ;; ediff-strip-mode-line-format expects that.
	  (setq mode-line-format
		(list " Ancestor: "
		      (cond ((not (stringp buf-C-state-merge))
			     "")
			    ((string-match "prefer-A" buf-C-state-merge)
			     "[=diff(B)] ")
			    ((string-match "prefer-B" buf-C-state-merge)
			     "[=diff(A)] ")
			    (t ""))
		      mode-line-format))))
    ))


(defun ediff-refresh-control-frame ()
  ;; Set frame/icon titles.
  (modify-frame-parameters
   ediff-control-frame
   (list (cons 'title (ediff-make-base-title))
	 (cons 'icon-name (ediff-make-narrow-control-buffer-id)))))


(defun ediff-make-narrow-control-buffer-id (&optional skip-name)
  (concat
   (if skip-name
       " "
     (ediff-make-base-title))
   (cond ((< ediff-current-difference 0)
	  (format " _/%d" ediff-number-of-differences))
	 ((>= ediff-current-difference ediff-number-of-differences)
	  (format " $/%d" ediff-number-of-differences))
	 (t
	  (format " %d/%d"
		  (1+ ediff-current-difference)
		  ediff-number-of-differences)))))

(defun ediff-make-base-title ()
  (concat
   (cdr (assoc 'name ediff-control-frame-parameters))
   ediff-control-buffer-suffix))

(defun ediff-make-wide-control-buffer-id ()
  (cond ((< ediff-current-difference 0)
	 (list (format "%%b   At start of %d diffs"
		       ediff-number-of-differences)))
	((>= ediff-current-difference ediff-number-of-differences)
	 (list (format "%%b   At end of %d diffs"
		       ediff-number-of-differences)))
	(t
	 (list (format "%%b   diff %d of %d"
		       (1+ ediff-current-difference)
		       ediff-number-of-differences)))))



;; If buff is not live, return nil
(defun ediff-get-visible-buffer-window (buff)
  (if (ediff-buffer-live-p buff)
      (get-buffer-window buff 'visible)))


;;; Functions to decide when to redraw windows

(defun ediff-keep-window-config (control-buf)
  (and (eq control-buf (current-buffer))
       (/= (buffer-size) 0)
       (ediff-with-current-buffer control-buf
	 (let ((ctl-wind ediff-control-window)
	       (A-wind ediff-window-A)
	       (B-wind ediff-window-B)
	       (C-wind ediff-window-C)
               (ancestor-job ediff-merge-with-ancestor-job)
               (Ancestor-wind ediff-window-Ancestor))

	   (and
	    (ediff-window-visible-p A-wind)
	    (ediff-window-visible-p B-wind)
	    ;; if buffer C is defined then take it into account
	    (or (not ediff-3way-job)
		(ediff-window-visible-p C-wind))
            (or (not ancestor-job)
                (not ediff-show-ancestor)
                (ediff-window-visible-p Ancestor-wind))
	    (eq (window-buffer A-wind) ediff-buffer-A)
	    (eq (window-buffer B-wind) ediff-buffer-B)
	    (or (not ediff-3way-job)
		(eq (window-buffer C-wind) ediff-buffer-C))
            (or (not ancestor-job)
                (not ediff-show-ancestor)
                (eq (window-buffer Ancestor-wind) ediff-ancestor-buffer))
	    (string= ediff-window-config-saved
		     (format "%S%S%S%S%S%S%S%S"
			     ctl-wind A-wind B-wind C-wind Ancestor-wind
			     ediff-split-window-function
			     (ediff-multiframe-setup-p)
			     ediff-wide-display-p)))))))

(defun ediff-compute-toolbar-width ()
  (declare (obsolete nil "28.1"))
  0)

(provide 'ediff-wind)
;;; ediff-wind.el ends here

debug log:

solving c68dc71884 ...
found c68dc71884 in https://git.savannah.gnu.org/cgit/emacs.git

(*) 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).