xdisp.c 149 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Display generation from window structure and buffer text.
Karl Heuer's avatar
Karl Heuer committed
2
   Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

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
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 11 12 13 14 15 16 17
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; see the file COPYING.  If not, write to
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
20 21


22
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
23 24 25 26
#include <stdio.h>
/*#include <ctype.h>*/
#undef NULL
#include "lisp.h"
Jim Blandy's avatar
Jim Blandy committed
27
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
28 29 30 31
#include "window.h"
#include "termchar.h"
#include "dispextern.h"
#include "buffer.h"
32
#include "charset.h"
Jim Blandy's avatar
Jim Blandy committed
33 34 35 36
#include "indent.h"
#include "commands.h"
#include "macros.h"
#include "disptab.h"
37
#include "termhooks.h"
38
#include "intervals.h"
Karl Heuer's avatar
Karl Heuer committed
39
#include "keyboard.h"
40 41
#include "coding.h"
#include "process.h"
Jim Blandy's avatar
Jim Blandy committed
42

43
#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI)
44
extern void set_frame_menubar ();
45
extern int pending_menu_activation;
46 47
#endif

Jim Blandy's avatar
Jim Blandy committed
48 49 50
extern int interrupt_input;
extern int command_loop_level;

51 52
extern int minibuffer_auto_raise;

53 54
extern Lisp_Object Qface;

55 56 57
extern Lisp_Object Voverriding_local_map;
extern Lisp_Object Voverriding_local_map_menu_flag;

58
Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map;
59
Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
60
Lisp_Object Qredisplay_end_trigger_functions;
61

62
/* Nonzero means print newline to stdout before next minibuffer message.  */
Jim Blandy's avatar
Jim Blandy committed
63 64 65

int noninteractive_need_newline;

66 67
/* Nonzero means print newline to message log before next message.  */

68
static int message_log_need_newline;
69

Jim Blandy's avatar
Jim Blandy committed
70 71
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
Karl Heuer's avatar
Karl Heuer committed
72 73
#define minmax(floor, val, ceil) \
	((val) < (floor) ? (floor) : (val) > (ceil) ? (ceil) : (val))
Jim Blandy's avatar
Jim Blandy committed
74 75

/* The buffer position of the first character appearing
Jim Blandy's avatar
Jim Blandy committed
76 77
 entirely or partially on the current frame line.
 Or zero, which disables the optimization for the current frame line. */
Jim Blandy's avatar
Jim Blandy committed
78 79 80 81 82 83
static int this_line_bufpos;

/* Number of characters past the end of this line,
   including the terminating newline */
static int this_line_endpos;

Jim Blandy's avatar
Jim Blandy committed
84
/* The vertical position of this frame line. */
Jim Blandy's avatar
Jim Blandy committed
85 86
static int this_line_vpos;

Jim Blandy's avatar
Jim Blandy committed
87
/* Hpos value for start of display on this frame line.
Jim Blandy's avatar
Jim Blandy committed
88 89 90 91 92 93 94 95
   Usually zero, but negative if first character really began
   on previous line */
static int this_line_start_hpos;

/* Buffer that this_line variables are describing. */
static struct buffer *this_line_buffer;

/* Value of echo_area_glyphs when it was last acted on.
Jim Blandy's avatar
Jim Blandy committed
96
  If this is nonzero, there is a message on the frame
Jim Blandy's avatar
Jim Blandy committed
97 98 99 100
  in the minibuffer and it should be erased as soon
  as it is no longer requested to appear. */
char *previous_echo_glyphs;

Jim Blandy's avatar
Jim Blandy committed
101
/* Nonzero means truncate lines in all windows less wide than the frame */
Jim Blandy's avatar
Jim Blandy committed
102 103
int truncate_partial_width_windows;

104 105 106 107
/* Nonzero means we have more than one non-minibuffer-only frame.
   Not guaranteed to be accurate except while parsing frame-title-format.  */
int multiple_frames;

Jim Blandy's avatar
Jim Blandy committed
108 109 110 111 112 113 114 115
Lisp_Object Vglobal_mode_string;

/* Marker for where to display an arrow on top of the buffer text.  */
Lisp_Object Voverlay_arrow_position;

/* String to display for the arrow.  */
Lisp_Object Voverlay_arrow_string;

116 117 118 119 120 121
/* Like mode-line-format, but for the titlebar on a visible frame.  */
Lisp_Object Vframe_title_format;

/* Like mode-line-format, but for the titlebar on an iconified frame.  */
Lisp_Object Vicon_title_format;

122 123 124 125 126
/* List of functions to call when a window's size changes.  These
   functions get one arg, a frame on which one or more windows' sizes
   have changed.  */
static Lisp_Object Vwindow_size_change_functions;

Jim Blandy's avatar
Jim Blandy committed
127
/* Values of those variables at last redisplay.  */
128
static Lisp_Object last_arrow_position, last_arrow_string;
Jim Blandy's avatar
Jim Blandy committed
129

130 131
Lisp_Object Qmenu_bar_update_hook;

Jim Blandy's avatar
Jim Blandy committed
132 133 134
/* Nonzero if overlay arrow has been displayed once in this window.  */
static int overlay_arrow_seen;

Karl Heuer's avatar
Karl Heuer committed
135 136 137 138 139
/* Nonzero if visible end of buffer has already been displayed once
   in this window.  (We need this variable in case there are overlay
   strings that get displayed there.)  */
static int zv_strings_seen;

140 141 142
/* Nonzero means highlight the region even in nonselected windows.  */
static int highlight_nonselected_windows;

Jim Blandy's avatar
Jim Blandy committed
143
/* If cursor motion alone moves point off frame,
Jim Blandy's avatar
Jim Blandy committed
144
   Try scrolling this many lines up or down if that will bring it back.  */
145
static int scroll_step;
Jim Blandy's avatar
Jim Blandy committed
146

147 148 149 150
/* Non-0 means scroll just far enough to bring point back on the screen,
   when appropriate.  */
static int scroll_conservatively;

151 152 153 154
/* Recenter the window whenever point gets within this many lines
   of the top or bottom of the window.  */
int scroll_margin;

Jim Blandy's avatar
Jim Blandy committed
155 156 157 158
/* Nonzero if try_window_id has made blank lines at window bottom
 since the last redisplay that paused */
static int blank_end_of_window;

159 160
/* Number of windows showing the buffer of the selected window
   (or another buffer with the same base buffer).
Jim Blandy's avatar
Jim Blandy committed
161 162 163
   keyboard.c refers to this.  */
int buffer_shared;

Jim Blandy's avatar
Jim Blandy committed
164
/* display_text_line sets these to the frame position (origin 0) of point,
Jim Blandy's avatar
Jim Blandy committed
165 166 167 168 169 170
   whether the window is selected or not.
   Set one to -1 first to determine whether point was found afterwards.  */

static int cursor_vpos;
static int cursor_hpos;

171
static int debug_end_pos;
Jim Blandy's avatar
Jim Blandy committed
172 173 174 175

/* Nonzero means display mode line highlighted */
int mode_line_inverse_video;

176
static void redisplay_internal ();
177
static int message_log_check_duplicate ();
Jim Blandy's avatar
Jim Blandy committed
178 179 180 181
static void echo_area_display ();
void mark_window_display_accurate ();
static void redisplay_windows ();
static void redisplay_window ();
182
static void update_menu_bar ();
Jim Blandy's avatar
Jim Blandy committed
183 184 185 186 187 188 189
static void try_window ();
static int try_window_id ();
static struct position *display_text_line ();
static void display_mode_line ();
static int display_mode_element ();
static char *decode_mode_spec ();
static int display_string ();
190
static void display_menu_bar ();
191
static int display_count_lines ();
Jim Blandy's avatar
Jim Blandy committed
192 193

/* Prompt to display in front of the minibuffer contents */
194
Lisp_Object minibuf_prompt;
Jim Blandy's avatar
Jim Blandy committed
195 196 197 198 199 200 201 202 203 204

/* Width in columns of current minibuffer prompt.  */
int minibuf_prompt_width;

/* Message to display instead of minibuffer contents
   This is what the functions error and message make,
   and command echoing uses it as well.
   It overrides the minibuf_prompt as well as the buffer.  */
char *echo_area_glyphs;

205 206 207
/* This is the length of the message in echo_area_glyphs.  */
int echo_area_glyphs_length;

208 209 210 211 212
/* This is the window where the echo area message was displayed.
   It is always a minibuffer window, but it may not be the
   same window currently active as a minibuffer.  */
Lisp_Object echo_area_window;

Jim Blandy's avatar
Jim Blandy committed
213 214 215 216 217 218 219 220 221 222 223 224 225 226
/* true iff we should redraw the mode lines on the next redisplay */
int update_mode_lines;

/* Smallest number of characters before the gap
   at any time since last redisplay that finished.
   Valid for current buffer when try_window_id can be called.  */
int beg_unchanged;

/* Smallest number of characters after the gap
   at any time since last redisplay that finished.
   Valid for current buffer when try_window_id can be called.  */
int end_unchanged;

/* MODIFF as of last redisplay that finished;
227 228
   if it matches MODIFF, and overlay_unchanged_modified
   matches OVERLAY_MODIFF, that means beg_unchanged and end_unchanged
Jim Blandy's avatar
Jim Blandy committed
229 230 231
   contain no useful information */
int unchanged_modified;

232 233 234
/* OVERLAY_MODIFF as of last redisplay that finished.  */
int overlay_unchanged_modified;

Jim Blandy's avatar
Jim Blandy committed
235 236 237 238
/* Nonzero if window sizes or contents have changed
   since last redisplay that finished */
int windows_or_buffers_changed;

239 240 241 242 243
/* Nonzero after display_mode_line if %l was used
   and it displayed a line number.  */
int line_number_displayed;

/* Maximum buffer size for which to display line numbers.  */
244
static int line_number_display_limit;
Karl Heuer's avatar
Karl Heuer committed
245 246 247 248

/* Number of lines to keep in the message log buffer.
   t means infinite.  nil means don't log at all.  */
Lisp_Object Vmessage_log_max;
Jim Blandy's avatar
Jim Blandy committed
249

250 251
/* Output a newline in the *Messages* buffer if "needs" one.  */

252 253 254 255 256 257 258 259
void
message_log_maybe_newline ()
{
  if (message_log_need_newline)
    message_dolog ("", 0, 1);
}


260 261 262
/* Add a string to the message log, optionally terminated with a newline.
   This function calls low-level routines in order to bypass text property
   hooks, etc. which might not be safe to run.  */
263 264

void
265
message_dolog (m, len, nlflag)
266
     char *m;
267
     int len, nlflag;
Karl Heuer's avatar
Karl Heuer committed
268
{
269
  if (!NILP (Vmessage_log_max))
Karl Heuer's avatar
Karl Heuer committed
270 271 272
    {
      struct buffer *oldbuf;
      int oldpoint, oldbegv, oldzv;
273
      int old_windows_or_buffers_changed = windows_or_buffers_changed;
Karl Heuer's avatar
Karl Heuer committed
274 275

      oldbuf = current_buffer;
276
      Fset_buffer (Fget_buffer_create (build_string ("*Messages*")));
277
      current_buffer->undo_list = Qt;
Karl Heuer's avatar
Karl Heuer committed
278 279 280
      oldpoint = PT;
      oldbegv = BEGV;
      oldzv = ZV;
281 282
      BEGV = BEG;
      ZV = Z;
Karl Heuer's avatar
Karl Heuer committed
283
      if (oldpoint == Z)
284
	oldpoint += len + nlflag;
Karl Heuer's avatar
Karl Heuer committed
285
      if (oldzv == Z)
286
	oldzv += len + nlflag;
Karl Heuer's avatar
Karl Heuer committed
287
      TEMP_SET_PT (Z);
288 289 290
      if (len)
	insert_1 (m, len, 1, 0);
      if (nlflag)
Karl Heuer's avatar
Karl Heuer committed
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
	  int this_bol, prev_bol, dup;
	  insert_1 ("\n", 1, 1, 0);

	  this_bol = scan_buffer ('\n', Z, 0, -2, 0, 0);
	  if (this_bol > BEG)
	    {
	      prev_bol = scan_buffer ('\n', this_bol, 0, -2, 0, 0);
	      dup = message_log_check_duplicate (prev_bol, this_bol);
	      if (dup)
		{
		  if (oldpoint > prev_bol)
		    oldpoint -= min (this_bol, oldpoint) - prev_bol;
		  if (oldbegv > prev_bol)
		    oldbegv -= min (this_bol, oldbegv) - prev_bol;
		  if (oldzv > prev_bol)
		    oldzv -= min (this_bol, oldzv) - prev_bol;
		  del_range_1 (prev_bol, this_bol, 0);
		  if (dup > 1)
		    {
		      char dupstr[40];
		      int duplen;

		      /* If you change this format, don't forget to also
			 change message_log_check_duplicate.  */
		      sprintf (dupstr, " [%d times]", dup);
		      duplen = strlen (dupstr);
		      TEMP_SET_PT (Z-1);
		      if (oldpoint == Z)
			oldpoint += duplen;
		      if (oldzv == Z)
			oldzv += duplen;
		      insert_1 (dupstr, duplen, 1, 0);
		    }
		}
	    }

	  if (NATNUMP (Vmessage_log_max))
	    {
	      int pos = scan_buffer ('\n', Z, 0,
				     -XFASTINT (Vmessage_log_max) - 1, 0, 0);
	      oldpoint -= min (pos, oldpoint) - BEG;
	      oldbegv -= min (pos, oldbegv) - BEG;
	      oldzv -= min (pos, oldzv) - BEG;
	      del_range_1 (BEG, pos, 0);
	    }
Karl Heuer's avatar
Karl Heuer committed
337 338 339 340 341
	}
      BEGV = oldbegv;
      ZV = oldzv;
      TEMP_SET_PT (oldpoint);
      set_buffer_internal (oldbuf);
342
      windows_or_buffers_changed = old_windows_or_buffers_changed;
343
      message_log_need_newline = !nlflag;
Karl Heuer's avatar
Karl Heuer committed
344
    }
345 346
}

347 348 349 350 351
/* We are at the end of the buffer after just having inserted a newline.
   (Note: We depend on the fact we won't be crossing the gap.)
   Check to see if the most recent message looks a lot like the previous one.
   Return 0 if different, 1 if the new one should just replace it, or a
   value N > 1 if we should also append " [N times]".  */
352

353 354 355 356 357 358 359
static int
message_log_check_duplicate (prev_bol, this_bol)
     int prev_bol, this_bol;
{
  int i;
  int len = Z - 1 - this_bol;
  int seen_dots = 0;
360 361
  unsigned char *p1 = BUF_CHAR_ADDRESS (current_buffer, prev_bol);
  unsigned char *p2 = BUF_CHAR_ADDRESS (current_buffer, this_bol);
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383

  for (i = 0; i < len; i++)
    {
      if (i >= 3 && p1[i-3] == '.' && p1[i-2] == '.' && p1[i-1] == '.'
	  && p1[i] != '\n')
	seen_dots = 1;
      if (p1[i] != p2[i])
	return seen_dots;
    }
  p1 += len;
  if (*p1 == '\n')
    return 2;
  if (*p1++ == ' ' && *p1++ == '[')
    {
      int n = 0;
      while (*p1 >= '0' && *p1 <= '9')
	n = n * 10 + *p1++ - '0';
      if (strncmp (p1, " times]\n", 8) == 0)
	return n+1;
    }
  return 0;
}
384

385
/* Display an echo area message M with a specified length of LEN chars.
386
   The string may include null characters.  If M is 0, clear out any
387
   existing message, and let the minibuffer text show through.
388 389 390 391 392 393

   The buffer M must continue to exist until after the echo area
   gets cleared or some other message gets displayed there.

   Do not pass text that is stored in a Lisp string.
   Do not pass text in a buffer that was alloca'd.  */
394 395 396 397 398 399 400

void
message2 (m, len)
     char *m;
     int len;
{
  /* First flush out any partial line written with print.  */
401
  message_log_maybe_newline ();
402 403
  if (m)
    message_dolog (m, len, 1);
Karl Heuer's avatar
Karl Heuer committed
404 405 406 407
  message2_nolog (m, len);
}


408
/* The non-logging counterpart of message2.  */
Karl Heuer's avatar
Karl Heuer committed
409 410 411 412 413

void
message2_nolog (m, len)
     char *m;
     int len;
414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
{
  if (noninteractive)
    {
      if (noninteractive_need_newline)
	putc ('\n', stderr);
      noninteractive_need_newline = 0;
      fwrite (m, len, 1, stderr);
      if (cursor_in_echo_area == 0)
	fprintf (stderr, "\n");
      fflush (stderr);
    }
  /* A null message buffer means that the frame hasn't really been
     initialized yet.  Error messages get reported properly by
     cmd_error, so this must be just an informative message; toss it.  */
  else if (INTERACTIVE && FRAME_MESSAGE_BUF (selected_frame))
    {
430 431
      Lisp_Object mini_window;
      FRAME_PTR f;
432

433 434 435 436 437 438
      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));

      FRAME_SAMPLE_VISIBILITY (f);
439
      if (FRAME_VISIBLE_P (selected_frame)
440 441
	  && ! FRAME_VISIBLE_P (f))
	Fmake_frame_visible (WINDOW_FRAME (XWINDOW (mini_window)));
442 443 444 445 446

      if (m)
	{
	  echo_area_glyphs = m;
	  echo_area_glyphs_length = len;
447 448 449

	  if (minibuffer_auto_raise)
	    Fraise_frame  (WINDOW_FRAME (XWINDOW (mini_window)));
450
	}
451 452 453 454 455
      else
	echo_area_glyphs = previous_echo_glyphs = 0;

      do_pending_window_change ();
      echo_area_display ();
456
      update_frame (f, 1, 1);
457
      do_pending_window_change ();
458
      if (frame_up_to_date_hook != 0 && ! gc_in_progress)
459
	(*frame_up_to_date_hook) (f);
460 461
    }
}
462 463 464 465 466 467 468 469 470

/* Display a null-terminated echo area message M.  If M is 0, clear out any
   existing message, and let the minibuffer text show through.

   The buffer M must continue to exist until after the echo area
   gets cleared or some other message gets displayed there.

   Do not pass text that is stored in a Lisp string.
   Do not pass text in a buffer that was alloca'd.  */
471

472 473 474 475 476 477 478
void
message1 (m)
     char *m;
{
  message2 (m, (m ? strlen (m) : 0));
}

Karl Heuer's avatar
Karl Heuer committed
479 480 481 482 483 484 485
void
message1_nolog (m)
     char *m;
{
  message2_nolog (m, (m ? strlen (m) : 0));
}

486 487 488 489 490 491 492 493 494 495 496 497 498 499
/* Truncate what will be displayed in the echo area
   the next time we display it--but don't redisplay it now.  */

void
truncate_echo_area (len)
     int len;
{
  /* A null message buffer means that the frame hasn't really been
     initialized yet.  Error messages get reported properly by
     cmd_error, so this must be just an informative message; toss it.  */
  if (!noninteractive && INTERACTIVE && FRAME_MESSAGE_BUF (selected_frame))
    echo_area_glyphs_length = len;
}

Jim Blandy's avatar
Jim Blandy committed
500
/* Nonzero if FRAME_MESSAGE_BUF (selected_frame) is being used by print;
Jim Blandy's avatar
Jim Blandy committed
501 502 503
   zero if being used by message.  */
int message_buf_print;

504
/* Dump an informative message to the minibuf.  If M is 0, clear out
505
   any existing message, and let the minibuffer text show through.  */
506

Jim Blandy's avatar
Jim Blandy committed
507 508 509 510
/* VARARGS 1 */
void
message (m, a1, a2, a3)
     char *m;
511
     EMACS_INT a1, a2, a3;
Jim Blandy's avatar
Jim Blandy committed
512 513 514
{
  if (noninteractive)
    {
515 516 517 518 519 520
      if (m)
	{
	  if (noninteractive_need_newline)
	    putc ('\n', stderr);
	  noninteractive_need_newline = 0;
	  fprintf (stderr, m, a1, a2, a3);
521 522
	  if (cursor_in_echo_area == 0)
	    fprintf (stderr, "\n");
523 524
	  fflush (stderr);
	}
Jim Blandy's avatar
Jim Blandy committed
525
    }
526
  else if (INTERACTIVE)
Jim Blandy's avatar
Jim Blandy committed
527
    {
528 529 530
      /* The frame whose minibuffer we're going to display the message on.
	 It may be larger than the selected frame, so we need
	 to use its buffer, not the selected frame's buffer.  */
531 532 533 534 535 536 537
      Lisp_Object mini_window;
      FRAME_PTR f;

      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
538 539 540 541

      /* A null message buffer means that the frame hasn't really been
	 initialized yet.  Error messages get reported properly by
	 cmd_error, so this must be just an informative message; toss it.  */
542
      if (FRAME_MESSAGE_BUF (f))
543
	{
544 545
	  if (m)
	    {
546
	      int len;
Jim Blandy's avatar
Jim Blandy committed
547
#ifdef NO_ARG_ARRAY
548
	      EMACS_INT a[3];
549 550 551
	      a[0] = a1;
	      a[1] = a2;
	      a[2] = a3;
Jim Blandy's avatar
Jim Blandy committed
552

553
	      len = doprnt (FRAME_MESSAGE_BUF (f),
554
			    FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a);
Jim Blandy's avatar
Jim Blandy committed
555
#else
556
	      len = doprnt (FRAME_MESSAGE_BUF (f),
557
			    FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, &a1);
558 559
#endif /* NO_ARG_ARRAY */

560
	      message2 (FRAME_MESSAGE_BUF (f), len);
561 562 563 564 565 566 567
	    }
	  else
	    message1 (0);

	  /* Print should start at the beginning of the message
	     buffer next time.  */
	  message_buf_print = 0;
568
	}
Jim Blandy's avatar
Jim Blandy committed
569 570 571
    }
}

572
/* The non-logging version of message.  */
Karl Heuer's avatar
Karl Heuer committed
573 574 575 576 577 578 579 580 581 582 583 584
void
message_nolog (m, a1, a2, a3)
     char *m;
     EMACS_INT a1, a2, a3;
{
  Lisp_Object old_log_max;
  old_log_max = Vmessage_log_max;
  Vmessage_log_max = Qnil;
  message (m, a1, a2, a3);
  Vmessage_log_max = old_log_max;
}

585 586 587 588 589
void
update_echo_area ()
{
  message2 (echo_area_glyphs, echo_area_glyphs_length);
}
590

Jim Blandy's avatar
Jim Blandy committed
591 592 593 594
static void
echo_area_display ()
{
  register int vpos;
Jim Blandy's avatar
Jim Blandy committed
595
  FRAME_PTR f;
596
  Lisp_Object mini_window;
Jim Blandy's avatar
Jim Blandy committed
597

598 599 600 601 602
  /* Choose the minibuffer window for this display.
     It is the minibuffer window used by the selected frame.  */
  mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
  /* This is the frame that window is in.  */
  f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
Jim Blandy's avatar
Jim Blandy committed
603

Jim Blandy's avatar
Jim Blandy committed
604
  if (! FRAME_VISIBLE_P (f))
Jim Blandy's avatar
Jim Blandy committed
605 606
    return;

Jim Blandy's avatar
Jim Blandy committed
607
  if (frame_garbaged)
Jim Blandy's avatar
Jim Blandy committed
608
    {
609
      redraw_garbaged_frames ();
Jim Blandy's avatar
Jim Blandy committed
610
      frame_garbaged = 0;
Jim Blandy's avatar
Jim Blandy committed
611 612 613 614
    }

  if (echo_area_glyphs || minibuf_level == 0)
    {
615 616
      int i;

617 618 619
      echo_area_window = mini_window;

      vpos = XFASTINT (XWINDOW (mini_window)->top);
Jim Blandy's avatar
Jim Blandy committed
620
      get_display_line (f, vpos, 0);
621 622 623 624 625 626

      /* Make sure the columns that overlap a left-hand scroll bar
	 are always clear.  */
      for (i = 0; i < FRAME_LEFT_SCROLL_BAR_WIDTH (f); i++)
	f->desired_glyphs->glyphs[vpos][i] = SPACEGLYPH;

627
      display_string (XWINDOW (mini_window), vpos,
Jim Blandy's avatar
Jim Blandy committed
628
		      echo_area_glyphs ? echo_area_glyphs : "",
629
		      echo_area_glyphs ? echo_area_glyphs_length : -1,
630
		      FRAME_LEFT_SCROLL_BAR_WIDTH (f),
631 632
		      0, 0, 0,
		      FRAME_WIDTH (f) + FRAME_LEFT_SCROLL_BAR_WIDTH (f));
Jim Blandy's avatar
Jim Blandy committed
633

634
#if 0 /* This just gets in the way.  update_frame does the job.  */
Jim Blandy's avatar
Jim Blandy committed
635
      /* If desired cursor location is on this line, put it at end of text */
636 637
      if (cursor_in_echo_area)
	FRAME_CURSOR_Y (f) = vpos;
Jim Blandy's avatar
Jim Blandy committed
638 639
      if (FRAME_CURSOR_Y (f) == vpos)
	FRAME_CURSOR_X (f) = FRAME_DESIRED_GLYPHS (f)->used[vpos];
640
#endif
Jim Blandy's avatar
Jim Blandy committed
641 642 643 644 645

      /* Fill the rest of the minibuffer window with blank lines.  */
      {
	int i;

646
	for (i = vpos + 1;
647
	     i < vpos + XFASTINT (XWINDOW (mini_window)->height); i++)
Jim Blandy's avatar
Jim Blandy committed
648
	  {
Jim Blandy's avatar
Jim Blandy committed
649
	    get_display_line (f, i, 0);
650
	    display_string (XWINDOW (mini_window), i,
651 652
			    "", 0, 
                            FRAME_LEFT_SCROLL_BAR_WIDTH (f),
653 654
			    0, 0, 0,
			    FRAME_WIDTH (f) + FRAME_LEFT_SCROLL_BAR_WIDTH (f));
Jim Blandy's avatar
Jim Blandy committed
655 656
	  }
      }
Jim Blandy's avatar
Jim Blandy committed
657
    }
658
  else if (!EQ (mini_window, selected_window))
Jim Blandy's avatar
Jim Blandy committed
659 660
    windows_or_buffers_changed++;

661
  if (EQ (mini_window, selected_window))
Jim Blandy's avatar
Jim Blandy committed
662 663 664 665
    this_line_bufpos = 0;

  previous_echo_glyphs = echo_area_glyphs;
}
666 667

/* Update frame titles.  */
668

669
#ifdef HAVE_WINDOW_SYSTEM
670 671
static char frame_title_buf[512];
static char *frame_title_ptr;
672

673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
static int
store_frame_title (str, mincol, maxcol)
     char *str;
     int mincol, maxcol;
{
  char *limit;
  if (maxcol < 0 || maxcol >= sizeof(frame_title_buf))
    maxcol = sizeof (frame_title_buf);
  limit = &frame_title_buf[maxcol];
  while (*str != '\0' && frame_title_ptr < limit)
    *frame_title_ptr++ = *str++;
  while (frame_title_ptr < &frame_title_buf[mincol])
    *frame_title_ptr++ = ' ';
  return frame_title_ptr - frame_title_buf;
}
688 689 690 691 692

static void
x_consider_frame_title (frame)
     Lisp_Object frame;
{
693 694 695
  Lisp_Object fmt;
  struct buffer *obuf;
  int len;
696 697
  FRAME_PTR f = XFRAME (frame);

698
  if (!(FRAME_WINDOW_P (f) || FRAME_MINIBUF_ONLY_P (f) || f->explicit_name))
699
    return;
700 701 702 703 704 705 706 707 708

  /* Do we have more than one visible frame on this X display?  */
  {
    Lisp_Object tail;

    for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
      {
	FRAME_PTR tf = XFRAME (XCONS (tail)->car);

709 710
	if (tf != f && FRAME_KBOARD (tf) == FRAME_KBOARD (f)
	    && !FRAME_MINIBUF_ONLY_P (tf)
711 712 713 714 715 716 717
	    && (FRAME_VISIBLE_P (tf) || FRAME_ICONIFIED_P (tf)))
	  break;
      }

    multiple_frames = CONSP (tail);
  }

718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
  obuf = current_buffer;
  Fset_buffer (XWINDOW (f->selected_window)->buffer);
  fmt = (FRAME_ICONIFIED_P (f) ? Vicon_title_format : Vframe_title_format);
  frame_title_ptr = frame_title_buf;
  len = display_mode_element (XWINDOW (f->selected_window), 0, 0, 0,
			      0, sizeof (frame_title_buf), fmt);
  frame_title_ptr = 0;
  set_buffer_internal (obuf);
  /* Set the name only if it's changed.  This avoids consing
     in the common case where it hasn't.  (If it turns out that we've
     already wasted too much time by walking through the list with
     display_mode_element, then we might need to optimize at a higher
     level than this.)  */
  if (! STRINGP (f->name) || XSTRING (f->name)->size != len
      || bcmp (frame_title_buf, XSTRING (f->name)->data, len) != 0)
    x_implicitly_set_name (f, make_string (frame_title_buf, len), Qnil);
734
}
735 736
#else
#define frame_title_ptr ((char *)0)
737
#define store_frame_title(str, mincol, maxcol) 0
738
#endif
Jim Blandy's avatar
Jim Blandy committed
739

740
/* Prepare for redisplay by updating menu-bar item lists when appropriate.
Richard M. Stallman's avatar
Richard M. Stallman committed
741
   This can call eval.  */
742 743 744 745 746 747

void
prepare_menu_bars ()
{
  register struct window *w = XWINDOW (selected_window);
  int all_windows;
748
  struct gcpro gcpro1, gcpro2;
749

750
  all_windows = (update_mode_lines || buffer_shared > 1
751
		 || windows_or_buffers_changed);
752

753 754 755 756 757 758 759 760 761 762
  /* Update all frame titles based on their buffer names, etc.
     We do this before the menu bars so that the buffer-menu
     will show the up-to-date frame titles.

     This used to be done after the menu bars, for a reason that
     was stated as follows but which I do not understand:
     "We do this after the menu bars so that the frame will first
     create its menu bar using the name `emacs' if no other name
     has yet been specified."
     I think that is no longer a concern.  */
763
#ifdef HAVE_WINDOW_SYSTEM
764
  if (windows_or_buffers_changed || update_mode_lines)
765 766 767 768 769 770 771 772 773 774
    {
      Lisp_Object tail, frame;

      FOR_EACH_FRAME (tail, frame)
	if (FRAME_VISIBLE_P (XFRAME (frame))
	    || FRAME_ICONIFIED_P (XFRAME (frame)))
	  x_consider_frame_title (frame);
    }
#endif

775 776 777 778 779 780
  /* Update the menu bar item lists, if appropriate.
     This has to be done before any actual redisplay
     or generation of display lines.  */
  if (all_windows)
    {
      Lisp_Object tail, frame;
781 782
      int count = specpdl_ptr - specpdl;

783
      record_unwind_protect (Fstore_match_data, Fmatch_data (Qnil, Qnil));
784 785

      FOR_EACH_FRAME (tail, frame)
786 787 788 789 790 791
	{
	  /* If a window on this frame changed size,
	     report that to the user and clear the size-change flag.  */
	  if (FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)))
	    {
	      Lisp_Object functions;
792 793
	      /* Clear flag first in case we get error below.  */
	      FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)) = 0;
794 795 796 797 798 799 800 801 802 803
	      functions = Vwindow_size_change_functions;
	      GCPRO2 (tail, functions);
	      while (CONSP (functions))
		{
		  call1 (XCONS (functions)->car, frame);
		  functions = XCONS (functions)->cdr;
		}
	      UNGCPRO;
	    }
	  GCPRO1 (tail);
804
	  update_menu_bar (XFRAME (frame), 0);
805 806
	  UNGCPRO;
	}
807 808

      unbind_to (count, Qnil);
809
    }
810
  else
811
    update_menu_bar (selected_frame, 1);
812 813 814 815 816 817

  /* Motif needs this.  See comment in xmenu.c.
     Turn it off when pending_menu_activation is not defined.  */
#ifdef USE_X_TOOLKIT
  pending_menu_activation = 0;
#endif
818 819
}

Jim Blandy's avatar
Jim Blandy committed
820
/* Do a frame update, taking possible shortcuts into account.
Jim Blandy's avatar
Jim Blandy committed
821 822 823 824 825 826
   This is the main external entry point for redisplay.

   If the last redisplay displayed an echo area message and that
   message is no longer requested, we clear the echo area
   or bring back the minibuffer if that is in use.

827 828 829 830 831 832
   Do not call eval from within this function.
   Calls to eval after the call to echo_area_display would confuse
   the display_line mechanism and would cause a crash.
   Calls to eval before that point will work most of the time,
   but can still lose, because  this function
   can be called from signal handlers; with alarms set up;
Jim Blandy's avatar
Jim Blandy committed
833
   or with synchronous processes running.
834

Jim Blandy's avatar
Jim Blandy committed
835 836 837
   See Fcall_process; if you called it from here, it could be
   entered recursively.  */

838 839
static int do_verify_charstarts;

840 841 842 843
/* Counter is used to clear the face cache
   no more than once ever 1000 redisplays.  */
static int clear_face_cache_count;

844 845 846
/* Record the previous terminal frame we displayed.  */
static FRAME_PTR previous_terminal_frame;

Jim Blandy's avatar
Jim Blandy committed
847 848
void
redisplay ()
849 850 851 852 853 854
{
  redisplay_internal (0);
}

/* If PRESERVE_ECHO_AREA is nonzero, it means this redisplay
   is not in response to any user action; therefore, we should
Richard M. Stallman's avatar
Richard M. Stallman committed
855 856
   preserve the echo area.  (Actually, our caller does that job.)
   Perhaps in the future avoid recentering windows
857 858 859 860 861
   if it is not necessary; currently that causes some problems.  */

static void
redisplay_internal (preserve_echo_area)
     int preserve_echo_area;
Jim Blandy's avatar
Jim Blandy committed
862 863 864 865 866 867 868
{
  register struct window *w = XWINDOW (selected_window);
  register int pause;
  int must_finish = 0;
  int all_windows;
  register int tlbufpos, tlendpos;
  struct position pos;
869
  int number_of_frames_redisplayed;
Jim Blandy's avatar
Jim Blandy committed
870 871 872 873

  if (noninteractive)
    return;

874 875 876 877 878
#ifdef USE_X_TOOLKIT
  if (popup_activated ())
    return;
#endif

879
  if (! FRAME_WINDOW_P (selected_frame)
880 881 882 883 884 885 886 887 888 889
      && previous_terminal_frame != selected_frame)
    {
      /* Since frames on an ASCII terminal share the same display area,
	 displaying a different frame means redisplay the whole thing.  */
      windows_or_buffers_changed++;
      SET_FRAME_GARBAGED (selected_frame);
      XSETFRAME (Vterminal_frame, selected_frame);
    }
  previous_terminal_frame = selected_frame;

890 891 892 893
  /* Set the visible flags for all frames.
     Do this before checking for resized or garbaged frames; they want
     to know if their frames are visible.
     See the comment in frame.h for FRAME_SAMPLE_VISIBILITY.  */
894
  number_of_frames_redisplayed = 0;
895
  {
896
    Lisp_Object tail, frame;
897

898
    FOR_EACH_FRAME (tail, frame)
899 900
      {
	FRAME_SAMPLE_VISIBILITY (XFRAME (frame));
901
	number_of_frames_redisplayed++;
902 903 904 905 906

	/* Clear out all the display lines in which we will generate the
	   glyphs to display.  */
	init_desired_glyphs (XFRAME (frame));
      }
907 908
  }

Jim Blandy's avatar
Jim Blandy committed
909
  /* Notice any pending interrupt request to change frame size.  */
Jim Blandy's avatar
Jim Blandy committed
910 911
  do_pending_window_change ();

Jim Blandy's avatar
Jim Blandy committed
912
  if (frame_garbaged)
Jim Blandy's avatar
Jim Blandy committed
913
    {
914
      redraw_garbaged_frames ();
Jim Blandy's avatar
Jim Blandy committed
915
      frame_garbaged = 0;
Jim Blandy's avatar
Jim Blandy committed
916 917
    }

918 919
  prepare_menu_bars ();

920
  if (windows_or_buffers_changed)
Jim Blandy's avatar
Jim Blandy committed
921 922
    update_mode_lines++;

923 924
  /* Detect case that we need to write or remove a star in the mode line.  */
  if ((SAVE_MODIFF < MODIFF) != !NILP (w->last_had_star))
Jim Blandy's avatar
Jim Blandy committed
925 926 927 928 929 930
    {
      w->update_mode_line = Qt;
      if (buffer_shared > 1)
	update_mode_lines++;
    }

931 932 933 934 935
  /* If %c is in use, update it if needed.  */
  if (!NILP (w->column_number_displayed)
      /* This alternative quickly identifies a common case
	 where no change is needed.  */
      && !(PT == XFASTINT (w->last_point)
936 937
	   && XFASTINT (w->last_modified) >= MODIFF
	   && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)
938 939 940
      && XFASTINT (w->column_number_displayed) != current_column ())
    w->update_mode_line = Qt; 

Jim Blandy's avatar
Jim Blandy committed
941
  FRAME_SCROLL_BOTTOM_VPOS (XFRAME (w->frame)) = -1;
Jim Blandy's avatar
Jim Blandy committed
942 943 944 945 946

  all_windows = update_mode_lines || buffer_shared > 1;

  /* If specs for an arrow have changed, do thorough redisplay
     to ensure we remove any arrow that should no longer exist.  */
947 948
  if (! EQ (Voverlay_arrow_position, last_arrow_position)
      || ! EQ (Voverlay_arrow_string, last_arrow_string))
949
    all_windows = 1;
Jim Blandy's avatar
Jim Blandy committed
950

951 952 953 954 955 956 957 958 959 960
  /* Normally the message* functions will have already displayed and
     updated the echo area, but the frame may have been trashed, or
     the update may have been preempted, so display the echo area
     again here.  */
  if (echo_area_glyphs || previous_echo_glyphs)
    {
      echo_area_display ();
      must_finish = 1;
    }

961 962 963 964
  /* If showing region, and mark has changed, must redisplay whole window.  */
  if (((!NILP (Vtransient_mark_mode)
	&& !NILP (XBUFFER (w->buffer)->mark_active))
       != !NILP (w->region_showing))
965 966 967
      || (!NILP (w->region_showing)
	  && !EQ (w->region_showing,
		  Fmarker_position (XBUFFER (w->buffer)->mark))))
968 969
    this_line_bufpos = -1;

Jim Blandy's avatar
Jim Blandy committed
970 971
  tlbufpos = this_line_bufpos;
  tlendpos = this_line_endpos;
Jim Blandy's avatar
Jim Blandy committed
972
  if (!all_windows && tlbufpos > 0 && NILP (w->update_mode_line)
973
      && !current_buffer->clip_changed
Jim Blandy's avatar
Jim Blandy committed
974
      && FRAME_VISIBLE_P (XFRAME (w->frame))
Jim Blandy's avatar
Jim Blandy committed
975 976 977
      /* Make sure recorded data applies to current buffer, etc */
      && this_line_buffer == current_buffer
      && current_buffer == XBUFFER (w->buffer)
Jim Blandy's avatar
Jim Blandy committed
978
      && NILP (w->force_start)
Jim Blandy's avatar
Jim Blandy committed
979
      /* Point must be on the line that we have info recorded about */
Karl Heuer's avatar
Karl Heuer committed
980 981
      && PT >= tlbufpos
      && PT <= Z - tlendpos
Jim Blandy's avatar
Jim Blandy committed
982 983
      /* All text outside that line, including its final newline,
	 must be unchanged */
984 985
      && ((XFASTINT (w->last_modified) >= MODIFF
	   && (XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF))
Jim Blandy's avatar
Jim Blandy committed
986 987
	  || (beg_unchanged >= tlbufpos - 1
	      && GPT >= tlbufpos
Jim Blandy's avatar
Jim Blandy committed
988 989
	      /* If selective display, can't optimize
		 if the changes start at the beginning of the line.  */
990
	      && ((INTEGERP (current_buffer->selective_display)
Jim Blandy's avatar
Jim Blandy committed
991 992 993 994
		   && XINT (current_buffer->selective_display) > 0
		   ? (beg_unchanged >= tlbufpos
		      && GPT > tlbufpos)
		   : 1))
Jim Blandy's avatar
Jim Blandy committed
995 996 997
	      && end_unchanged >= tlendpos
	      && Z - GPT >= tlendpos)))
    {
998
      if (tlbufpos > BEGV && FETCH_BYTE (tlbufpos - 1) != '\n'
Jim Blandy's avatar
Jim Blandy committed
999
	  && (tlbufpos == ZV
1000
	      || FETCH_BYTE (tlbufpos) == '\n'))
Jim Blandy's avatar
Jim Blandy committed
1001 1002 1003
	/* Former continuation line has disappeared by becoming empty */
	goto cancel;
      else if (XFASTINT (w->last_modified) < MODIFF
1004
	       || XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF
Jim Blandy's avatar
Jim Blandy committed
1005 1006
	       || MINI_WINDOW_P (w))
	{
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
	  /* We have to handle the case of continuation around a
	     wide-column character (See the comment in indent.c around
	     line 885).

	     For instance, in the following case:

	     --------  Insert  --------
	     K_A_N_\\   `a'    K_A_N_a\		`X_' are wide-column chars.
	     J_I_       ==>    J_I_		`^^' are cursors.
	     ^^                ^^
	     --------          --------

	     As we have to redraw the line above, we should goto cancel.  */

	  struct position val;
	  int prevline;

	  prevline = find_next_newline (tlbufpos, -1);
	  val = *compute_motion (prevline, 0,
				 XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0,
				 0,
				 tlbufpos,
				 1 << (BITS_PER_SHORT - 1),
				 1 << (BITS_PER_SHORT - 1),
				 window_internal_width (w) - 1,
				 XINT (w->hscroll), 0, w);
	  if (val.hpos != this_line_start_hpos)
	    goto cancel;

Jim Blandy's avatar
Jim Blandy committed
1036 1037
	  cursor_vpos = -1;
	  overlay_arrow_seen = 0;
Karl Heuer's avatar
Karl Heuer committed
1038
	  zv_strings_seen = 0;
Jim Blandy's avatar
Jim Blandy committed
1039
	  display_text_line (w, tlbufpos, this_line_vpos, this_line_start_hpos,
1040
			     pos_tab_offset (w, tlbufpos), 0);
Jim Blandy's avatar
Jim Blandy committed
1041 1042 1043 1044 1045
	  /* If line contains point, is not continued,
		 and ends at same distance from eob as before, we win */
	  if (cursor_vpos >= 0 && this_line_bufpos
	      && this_line_endpos == tlendpos)
	    {
1046 1047 1048 1049
	      /* If this is not the window's last line,
		 we must adjust the charstarts of the lines below.  */
	      if (this_line_vpos + 1
		  < XFASTINT (w->top) + window_internal_height (w))
1050
		{
1051
		  int left = WINDOW_LEFT_MARGIN (w);
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
		  int *charstart_next_line
		    = FRAME_CURRENT_GLYPHS (XFRAME (WINDOW_FRAME (w)))->charstarts[this_line_vpos + 1];
		  int adjust;

		  if (Z - tlendpos == ZV)
		    /* This line ends at end of (accessible part of) buffer.
		       There is no newline to count.  */
		    adjust = Z - tlendpos - charstart_next_line[left];
		  else
		    /* This line ends in a newline.
		       Must take account of the newline and the rest of the
		       text that follows.  */
		    adjust = Z - tlendpos + 1 - charstart_next_line[left];

		  adjust_window_charstarts (w, this_line_vpos, adjust);
		}
1068

1069
	      if (!WINDOW_FULL_WIDTH_P (w))
Jim Blandy's avatar
Jim Blandy committed
1070 1071 1072 1073 1074 1075
		preserve_other_columns (w);
	      goto update;
	    }
	  else
	    goto cancel;
	}
1076 1077 1078 1079 1080 1081
      else if (PT == XFASTINT (w->last_point)
	       /* Make sure the cursor was last displayed
		  in this window.  Otherwise we have to reposition it.  */
	       && XINT (w->top) <= FRAME_CURSOR_Y (selected_frame)
	       && (XINT (w->top) + XINT (w->height)
		   > FRAME_CURSOR_Y (selected_frame)))
Jim Blandy's avatar
Jim Blandy committed
1082 1083 1084 1085 1086 1087 1088 1089
	{
	  if (!must_finish)
	    {
	      do_pending_window_change ();
	      return;
	    }
	  goto update;
	}
1090 1091
      /* If highlighting the region, or if the cursor is in the echo area,
	 then we can't just move the cursor.  */
1092 1093
      else if (! (!NILP (Vtransient_mark_mode)
		  && !NILP (current_buffer->mark_active))
1094 1095
	       && (w == XWINDOW (current_buffer->last_selected_window)
		   || highlight_nonselected_windows)
1096 1097
	       && NILP (w->region_showing)
	       && !cursor_in_echo_area)
Jim Blandy's avatar
Jim Blandy committed
1098 1099 1100
	{
	  pos = *compute_motion (tlbufpos, 0,
				 XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0,
Karl Heuer's avatar
Karl Heuer committed
1101
				 0,
1102
				 PT, 2, - (1 << (BITS_PER_SHORT - 1)),
1103
				 window_internal_width (w) - 1,
Jim Blandy's avatar
Jim Blandy committed
1104
				 XINT (w->hscroll),
1105
				 pos_tab_offset (w, tlbufpos), w);
Jim Blandy's avatar
Jim Blandy committed
1106 1107
	  if (pos.vpos < 1)
	    {
Karl Heuer's avatar
Karl Heuer committed
1108
	      int width = window_internal_width (w) - 1;
Jim Blandy's avatar
Jim Blandy committed
1109
	      FRAME_CURSOR_X (selected_frame)
1110
		= WINDOW_LEFT_MARGIN (w) + minmax (0, pos.hpos, width);
Jim Blandy's avatar
Jim Blandy committed
1111
	      FRAME_CURSOR_Y (selected_frame) = this_line_vpos;
Jim Blandy's avatar
Jim Blandy committed
1112 1113 1114 1115 1116 1117 1118
	      goto update;
	    }
	  else
	    goto cancel;
	}
    cancel:
      /* Text changed drastically or point moved off of line */
Jim Blandy's avatar
Jim Blandy committed
1119
      cancel_line (this_line_vpos, selected_frame);
Jim Blandy's avatar
Jim Blandy committed
1120 1121 1122 1123 1124
    }

  this_line_bufpos = 0;
  all_windows |= buffer_shared > 1;

1125 1126
  clear_face_cache_count++;

Jim Blandy's avatar
Jim Blandy committed
1127