xdisp.c 118 KB
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/* Display generation from window structure and buffer text.
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   Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
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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
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the Free Software Foundation; either version 2, or (at your option)
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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
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


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#include <config.h>
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#include <stdio.h>
/*#include <ctype.h>*/
#undef NULL
#include "lisp.h"
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#include "frame.h"
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#include "window.h"
#include "termchar.h"
#include "dispextern.h"
#include "buffer.h"
#include "indent.h"
#include "commands.h"
#include "macros.h"
#include "disptab.h"
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#include "termhooks.h"
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#include "intervals.h"
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#ifdef USE_X_TOOLKIT
extern void set_frame_menubar ();
#endif

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extern int interrupt_input;
extern int command_loop_level;

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extern Lisp_Object Qface;

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/* Nonzero means print newline to stdout before next minibuffer message.  */
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int noninteractive_need_newline;

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

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static int message_log_need_newline;
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#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

/* The buffer position of the first character appearing
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 entirely or partially on the current frame line.
 Or zero, which disables the optimization for the current frame line. */
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static int this_line_bufpos;

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

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/* The vertical position of this frame line. */
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static int this_line_vpos;

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/* Hpos value for start of display on this frame line.
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   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;

/* Set by try_window_id to the vpos of first of any lines
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   scrolled on to the bottom of the frame.  These lines should
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   not be included in any general scroll computation.  */
static int scroll_bottom_vpos;

/* Value of echo_area_glyphs when it was last acted on.
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  If this is nonzero, there is a message on the frame
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  in the minibuffer and it should be erased as soon
  as it is no longer requested to appear. */
char *previous_echo_glyphs;

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/* Nonzero means truncate lines in all windows less wide than the frame */
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int truncate_partial_width_windows;

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/* 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;

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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;

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/* 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;

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/* 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;

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/* Values of those variables at last redisplay.  */
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static Lisp_Object last_arrow_position, last_arrow_string;
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Lisp_Object Qmenu_bar_update_hook;

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/* Nonzero if overlay arrow has been displayed once in this window.  */
static int overlay_arrow_seen;

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

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/* If cursor motion alone moves point off frame,
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   Try scrolling this many lines up or down if that will bring it back.  */
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static int scroll_step;
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/* Nonzero if try_window_id has made blank lines at window bottom
 since the last redisplay that paused */
static int blank_end_of_window;

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/* Number of windows showing the buffer of the selected window
   (or another buffer with the same base buffer).
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   keyboard.c refers to this.  */
int buffer_shared;

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/* display_text_line sets these to the frame position (origin 0) of point,
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   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;

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

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static int message_log_check_duplicate ();
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static void echo_area_display ();
void mark_window_display_accurate ();
static void redisplay_windows ();
static void redisplay_window ();
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static void update_menu_bar ();
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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 *fmodetrunc ();
static char *decode_mode_spec ();
static int display_string ();
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static void display_menu_bar ();
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static int display_count_lines ();
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/* Prompt to display in front of the minibuffer contents */
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Lisp_Object minibuf_prompt;
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/* 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;

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

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/* 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;
   if it matches MODIFF, beg_unchanged and end_unchanged
   contain no useful information */
int unchanged_modified;

/* Nonzero if head_clip or tail_clip of current buffer has changed
   since last redisplay that finished */
int clip_changed;

/* Nonzero if window sizes or contents have changed
   since last redisplay that finished */
int windows_or_buffers_changed;

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/* 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.  */
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static int line_number_display_limit;
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/* 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;
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void
message_log_maybe_newline ()
{
  if (message_log_need_newline)
    message_dolog ("", 0, 1);
}


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/* 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.  */
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void
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message_dolog (m, len, nlflag)
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     char *m;
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     int len, nlflag;
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{
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  if (!NILP (Vmessage_log_max))
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    {
      struct buffer *oldbuf;
      int oldpoint, oldbegv, oldzv;

      oldbuf = current_buffer;
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      Fset_buffer (Fget_buffer_create (build_string ("*Messages*")));
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      current_buffer->undo_list = Qt;
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      oldpoint = PT;
      oldbegv = BEGV;
      oldzv = ZV;
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      BEGV = BEG;
      ZV = Z;
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      if (oldpoint == Z)
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	oldpoint += len + nlflag;
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      if (oldzv == Z)
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	oldzv += len + nlflag;
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      TEMP_SET_PT (Z);
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      if (len)
	insert_1 (m, len, 1, 0);
      if (nlflag)
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	{
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	  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);
	    }
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	}
      BEGV = oldbegv;
      ZV = oldzv;
      TEMP_SET_PT (oldpoint);
      set_buffer_internal (oldbuf);
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      message_log_need_newline = !nlflag;
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    }
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}


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/* 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]".  */
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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;
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  unsigned char *p1 = BUF_CHAR_ADDRESS (current_buffer, prev_bol);
  unsigned char *p2 = BUF_CHAR_ADDRESS (current_buffer, this_bol);
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  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;
}

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/* Display an echo area message M with a specified length of LEN chars.
   The string may include null characters.  If m is 0, clear out any
   existing message, and let the minibuffer text show through.
   Do not pass text that is stored in a Lisp string.  */

void
message2 (m, len)
     char *m;
     int len;
{
  /* First flush out any partial line written with print.  */
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  message_log_maybe_newline ();
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  if (m)
    message_dolog (m, len, 1);
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  message2_nolog (m, len);
}


/* The non-logging part of that function.  */

void
message2_nolog (m, len)
     char *m;
     int len;
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{
  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))
    {
#ifdef MULTI_FRAME
      Lisp_Object minibuf_frame;

      choose_minibuf_frame ();
      minibuf_frame = WINDOW_FRAME (XWINDOW (minibuf_window));
      FRAME_SAMPLE_VISIBILITY (XFRAME (minibuf_frame));
      if (FRAME_VISIBLE_P (selected_frame)
	  && ! FRAME_VISIBLE_P (XFRAME (minibuf_frame)))
	Fmake_frame_visible (WINDOW_FRAME (XWINDOW (minibuf_window)));
#endif

      if (m)
	{
	  echo_area_glyphs = m;
	  echo_area_glyphs_length = len;
	}
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      else
	echo_area_glyphs = previous_echo_glyphs = 0;

      do_pending_window_change ();
      echo_area_display ();
      update_frame (XFRAME (XWINDOW (minibuf_window)->frame), 1, 1);
      do_pending_window_change ();
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      if (frame_up_to_date_hook != 0 && ! gc_in_progress)
	(*frame_up_to_date_hook) (XFRAME (XWINDOW (minibuf_window)->frame));
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    }
}

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void
message1 (m)
     char *m;
{
  message2 (m, (m ? strlen (m) : 0));
}

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void
message1_nolog (m)
     char *m;
{
  message2_nolog (m, (m ? strlen (m) : 0));
}

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/* 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;
}

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/* Nonzero if FRAME_MESSAGE_BUF (selected_frame) is being used by print;
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   zero if being used by message.  */
int message_buf_print;

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/* Dump an informative message to the minibuf.  If m is 0, clear out
   any existing message, and let the minibuffer text show through.  */
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/* VARARGS 1 */
void
message (m, a1, a2, a3)
     char *m;
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     EMACS_INT a1, a2, a3;
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{
  if (noninteractive)
    {
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      if (m)
	{
	  if (noninteractive_need_newline)
	    putc ('\n', stderr);
	  noninteractive_need_newline = 0;
	  fprintf (stderr, m, a1, a2, a3);
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	  if (cursor_in_echo_area == 0)
	    fprintf (stderr, "\n");
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	  fflush (stderr);
	}
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    }
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  else if (INTERACTIVE)
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    {
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      /* 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.  */
      FRAME_PTR echo_frame;
#ifdef MULTI_FRAME
      choose_minibuf_frame ();
      echo_frame = XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));
#else
      echo_frame = selected_frame;
#endif

      /* 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 (FRAME_MESSAGE_BUF (echo_frame))
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	{
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	  if (m)
	    {
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	      int len;
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#ifdef NO_ARG_ARRAY
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	      EMACS_INT a[3];
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	      a[0] = a1;
	      a[1] = a2;
	      a[2] = a3;
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	      len = doprnt (FRAME_MESSAGE_BUF (echo_frame),
			    FRAME_WIDTH (echo_frame), m, 0, 3, a);
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#else
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	      len = doprnt (FRAME_MESSAGE_BUF (echo_frame),
			    FRAME_WIDTH (echo_frame), m, 0, 3, &a1);
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#endif /* NO_ARG_ARRAY */

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	      message2 (FRAME_MESSAGE_BUF (echo_frame), len);
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	    }
	  else
	    message1 (0);

	  /* Print should start at the beginning of the message
	     buffer next time.  */
	  message_buf_print = 0;
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	}
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    }
}

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/* The non-logging version of that function.  */
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;
}

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void
update_echo_area ()
{
  message2 (echo_area_glyphs, echo_area_glyphs_length);
}

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static void
echo_area_display ()
{
  register int vpos;
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  FRAME_PTR f;
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#ifdef MULTI_FRAME
  choose_minibuf_frame ();
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#endif

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  f = XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));
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  if (! FRAME_VISIBLE_P (f))
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    return;

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  if (frame_garbaged)
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    {
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      redraw_garbaged_frames ();
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      frame_garbaged = 0;
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    }

  if (echo_area_glyphs || minibuf_level == 0)
    {
      vpos = XFASTINT (XWINDOW (minibuf_window)->top);
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      get_display_line (f, vpos, 0);
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      display_string (XWINDOW (minibuf_window), vpos,
		      echo_area_glyphs ? echo_area_glyphs : "",
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		      echo_area_glyphs ? echo_area_glyphs_length : -1,
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		      0, 0, 0, 0, FRAME_WIDTH (f));
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      /* If desired cursor location is on this line, put it at end of text */
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      if (cursor_in_echo_area)
	FRAME_CURSOR_Y (f) = vpos;
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      if (FRAME_CURSOR_Y (f) == vpos)
	FRAME_CURSOR_X (f) = FRAME_DESIRED_GLYPHS (f)->used[vpos];
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      /* Fill the rest of the minibuffer window with blank lines.  */
      {
	int i;

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	for (i = vpos + 1;
	     i < vpos + XFASTINT (XWINDOW (minibuf_window)->height); i++)
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	  {
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	    get_display_line (f, i, 0);
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	    display_string (XWINDOW (minibuf_window), vpos,
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			    "", 0, 0, 0, 0, 0, FRAME_WIDTH (f));
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	  }
      }
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    }
  else if (!EQ (minibuf_window, selected_window))
    windows_or_buffers_changed++;

  if (EQ (minibuf_window, selected_window))
    this_line_bufpos = 0;

  previous_echo_glyphs = echo_area_glyphs;
}
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#ifdef HAVE_X_WINDOWS
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static char frame_title_buf[512];
static char *frame_title_ptr;
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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;
}
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static void
x_consider_frame_title (frame)
     Lisp_Object frame;
{
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  Lisp_Object fmt;
  struct buffer *obuf;
  int len;
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  FRAME_PTR f = XFRAME (frame);

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  if (!FRAME_X_P (f) || FRAME_MINIBUF_ONLY_P (f) || f->explicit_name)
    return;
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  /* 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);

	if (tf != f && tf->kboard == f->kboard && !FRAME_MINIBUF_ONLY_P (tf)
	    && (FRAME_VISIBLE_P (tf) || FRAME_ICONIFIED_P (tf)))
	  break;
      }

    multiple_frames = CONSP (tail);
  }

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  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);
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}
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#else
#define frame_title_ptr ((char *)0)
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#define store_frame_title(str, mincol, maxcol) 0
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#endif
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665

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/* Prepare for redisplay by updating menu-bar item lists when appropriate.
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   This can call eval.  */
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void
prepare_menu_bars ()
{
  register struct window *w = XWINDOW (selected_window);
  int all_windows;
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  struct gcpro gcpro1, gcpro2;
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  all_windows = (update_mode_lines || buffer_shared > 1
		 || clip_changed || windows_or_buffers_changed);
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  /* 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;
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      int count = specpdl_ptr - specpdl;

      record_unwind_protect (Fstore_match_data, Fmatch_data ());
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      FOR_EACH_FRAME (tail, frame)
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	{
	  /* 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;
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	      /* Clear flag first in case we get error below.  */
	      FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)) = 0;
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	      functions = Vwindow_size_change_functions;
	      GCPRO2 (tail, functions);
	      while (CONSP (functions))
		{
		  call1 (XCONS (functions)->car, frame);
		  functions = XCONS (functions)->cdr;
		}
	      UNGCPRO;
	    }
	  GCPRO1 (tail);
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	  update_menu_bar (XFRAME (frame), 0);
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	  UNGCPRO;
	}
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      unbind_to (count, Qnil);
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    }
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  else
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    update_menu_bar (selected_frame, 1);
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  /* Update all frame titles based on their buffer names, etc.
     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.  */
#ifdef HAVE_X_WINDOWS
  if (windows_or_buffers_changed)
    {
      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
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}

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/* Do a frame update, taking possible shortcuts into account.
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   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.

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   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;
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   or with synchronous processes running.
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   See Fcall_process; if you called it from here, it could be
   entered recursively.  */

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static int do_verify_charstarts;

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

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void
redisplay ()
{
  register struct window *w = XWINDOW (selected_window);
  register int pause;
  int must_finish = 0;
  int all_windows;
  register int tlbufpos, tlendpos;
  struct position pos;

  if (noninteractive)
    return;

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  /* 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.  */
  {
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    Lisp_Object tail, frame;
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    FOR_EACH_FRAME (tail, frame)
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      {
	FRAME_SAMPLE_VISIBILITY (XFRAME (frame));

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

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  /* Notice any pending interrupt request to change frame size.  */
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  do_pending_window_change ();

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  if (frame_garbaged)
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    {
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      redraw_garbaged_frames ();
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      frame_garbaged = 0;
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    }

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  prepare_menu_bars ();

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  if (clip_changed || windows_or_buffers_changed
      || (!NILP (w->column_number_displayed)
	  && XFASTINT (w->column_number_displayed) != current_column ()))
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    update_mode_lines++;

  /* Detect case that we need to write a star in the mode line.  */
  if (XFASTINT (w->last_modified) < MODIFF
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      && XFASTINT (w->last_modified) <= SAVE_MODIFF)
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    {
      w->update_mode_line = Qt;
      if (buffer_shared > 1)
	update_mode_lines++;
    }

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  FRAME_SCROLL_BOTTOM_VPOS (XFRAME (w->frame)) = -1;
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  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.  */
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  if (! EQ (Voverlay_arrow_position, last_arrow_position)
      || ! EQ (Voverlay_arrow_string, last_arrow_string))
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    all_windows = 1, clip_changed = 1;

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  /* 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;
    }

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  /* 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))
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      || (!NILP (w->region_showing)
	  && !EQ (w->region_showing,
		  Fmarker_position (XBUFFER (w->buffer)->mark))))
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    this_line_bufpos = -1;

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  tlbufpos = this_line_bufpos;
  tlendpos = this_line_endpos;
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  if (!all_windows && tlbufpos > 0 && NILP (w->update_mode_line)
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      && FRAME_VISIBLE_P (XFRAME (w->frame))
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      /* Make sure recorded data applies to current buffer, etc */
      && this_line_buffer == current_buffer
      && current_buffer == XBUFFER (w->buffer)
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      && NILP (w->force_start)
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      /* Point must be on the line that we have info recorded about */
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      && PT >= tlbufpos
      && PT <= Z - tlendpos
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      /* All text outside that line, including its final newline,
	 must be unchanged */
      && (XFASTINT (w->last_modified) >= MODIFF
	  || (beg_unchanged >= tlbufpos - 1
	      && GPT >= tlbufpos
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	      /* If selective display, can't optimize
		 if the changes start at the beginning of the line.  */
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	      && ((INTEGERP (current_buffer->selective_display)
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		   && XINT (current_buffer->selective_display) > 0
		   ? (beg_unchanged >= tlbufpos
		      && GPT > tlbufpos)
		   : 1))
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	      && end_unchanged >= tlendpos
	      && Z - GPT >= tlendpos)))
    {
      if (tlbufpos > BEGV && FETCH_CHAR (tlbufpos - 1) != '\n'
	  && (tlbufpos == ZV
	      || FETCH_CHAR (tlbufpos) == '\n'))
	/* Former continuation line has disappeared by becoming empty */
	goto cancel;
      else if (XFASTINT (w->last_modified) < MODIFF
	       || MINI_WINDOW_P (w))
	{
	  cursor_vpos = -1;
	  overlay_arrow_seen = 0;
	  display_text_line (w, tlbufpos, this_line_vpos, this_line_start_hpos,
			     pos_tab_offset (w, tlbufpos));
	  /* 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)
	    {
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	      /* 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))
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		{
		  int left = XFASTINT (w->left);
		  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);
		}
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	      if (XFASTINT (w->width) != FRAME_WIDTH (XFRAME (WINDOW_FRAME (w))))
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		preserve_other_columns (w);
	      goto update;
	    }
	  else
	    goto cancel;
	}
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      else if (PT == XFASTINT (w->last_point))
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	{
	  if (!must_finish)
	    {
	      do_pending_window_change ();
	      return;
	    }
	  goto update;
	}
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      /* If highlighting the region, or if the cursor is in the echo area,
	 then we can't just move the cursor.  */
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      else if (! (!NILP (Vtransient_mark_mode)
		  && !NILP (current_buffer->mark_active))
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	       && NILP (w->region_showing)
	       && !cursor_in_echo_area)
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	{
	  pos = *compute_motion (tlbufpos, 0,
				 XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0,
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				 PT, 2, - (1 << (SHORTBITS - 1)),
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				 window_internal_width (w) - 1,
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				 XINT (w->hscroll),
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				 pos_tab_offset (w, tlbufpos), w);
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	  if (pos.vpos < 1)
	    {
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	      FRAME_CURSOR_X (selected_frame)
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		= XFASTINT (w->left) + max (pos.hpos, 0);
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	      FRAME_CURSOR_Y (selected_frame) = this_line_vpos;
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	      goto update;
	    }
	  else
	    goto cancel;
	}
    cancel:
      /* Text changed drastically or point moved off of line */
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      cancel_line (this_line_vpos, selected_frame);
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    }

  this_line_bufpos = 0;
  all_windows |= buffer_shared > 1;

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  clear_face_cache_count++;

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  if (all_windows)
    {
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      Lisp_Object tail, frame;
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#ifdef HAVE_FACES
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      /* Clear the face cache, only when we do a full redisplay
	 and not too often either.  */
      if (clear_face_cache_count > 1000)
	{
	  clear_face_cache ();
	  clear_face_cache_count = 0;
	}
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#endif

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      /* Recompute # windows showing selected buffer.
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	 This will be incremented each time such a window is displayed.  */
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      buffer_shared = 0;

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      FOR_EACH_FRAME (tail, frame)
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	{
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	  FRAME_PTR f = XFRAME (frame);
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	  if (! FRAME_TERMCAP_P (f) || f == selected_frame)
	    {
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	      /* Mark all the scroll bars to be removed; we'll redeem the ones
		 we want when we redisplay their windows.  */
	      if (condemn_scroll_bars_hook)
		(*condemn_scroll_bars_hook) (f);
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	      if (FRAME_VISIBLE_P (f))
		redisplay_windows (FRAME_ROOT_WINDOW (f));
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	      /* Any scroll bars which redisplay_windows should have nuked
		 should now go away.  */
	      if (judge_scroll_bars_hook)
		(*judge_scroll_bars_hook) (f);
	    }
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	}
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    }
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  else if (FRAME_VISIBLE_P (selected_frame))
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    {
      redisplay_window (selected_window, 1);
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      if (XFASTINT (w->width) != FRAME_WIDTH (selected_frame))
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	preserve_other_columns (w);
    }

update: 
  /* Prevent various kinds of signals during display update.
     stdio is not robust about handling signals,
     which can cause an apparent I/O error.  */
  if (interrupt_input)
    unrequest_sigio ();
  stop_polling ();

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#ifdef MULTI_FRAME
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  if (all_windows)
    {
      Lisp_Object tail;

      pause = 0;

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      for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
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	{
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	  FRAME_PTR f;
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	  if (!FRAMEP (XCONS (tail)->car))
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	    continue;

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	  f = XFRAME (XCONS (tail)->car);
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	  if ((! FRAME_TERMCAP_P (f) || f == selected_frame)
	      && FRAME_VISIBLE_P (f))
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	    {
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	      pause |= update_frame (f, 0, 0);
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	      if (!pause)
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		{
		  mark_window_display_accurate (f->root_window, 1);
		  if (frame_up_to_date_hook != 0)
		    (*frame_up_to_date_hook) (f);
		}
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	    }
	}
    }
  else
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#endif /* MULTI_FRAME */
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    {
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      if (FRAME_VISIBLE_P (selected_frame))
	pause = update_frame (selected_frame, 0, 0);
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      else
	pause = 0;
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      /* We may have called echo_area_display at the top of this
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	 function.  If the echo area is on another frame, that may
	 have put text on a frame other than the selected one, so the
	 above call to update_frame would not have caught it.  Catch
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	 it here.  */
      {
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	FRAME_PTR mini_frame
	  = XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));
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	if (mini_frame != selected_frame)
	  pause |= update_frame (mini_frame, 0, 0);
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      }
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    }
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  /* If frame does not match, prevent doing single-line-update next time.
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     Also, don't forget to check every line to update the arrow.  */
  if (pause)
    {
      this_line_bufpos = 0;
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      if (!NILP (last_arrow_position))
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	{
	  last_arrow_position = Qt;
	  last_arrow_string = Qt;
	}
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      /* If we pause after scrolling, some lines in current_frame
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	 may be null, so preserve_other_columns won't be able to
	 preserve all the vertical-bar separators.  So, avoid using it
	 in that case.  */
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      if (XFASTINT (w->width) != FRAME_WIDTH (selected_frame))
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	update_mode_lines = 1;
    }

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  /* Now text on frame agrees with windows, so
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     put info into the windows for partial redisplay to follow */

  if (!pause)
    {
      register struct buffer *b = XBUFFER (w->buffer);

      blank_end_of_window = 0;
      clip_changed = 0;
      unchanged_modified = BUF_MODIFF (b);
      beg_unchanged = BUF_GPT (b) - BUF_BEG (b);
      end_unchanged = BUF_Z (b) - BUF_GPT (b);

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      XSETFASTINT (w->last_point, BUF_PT (b));
      XSETFASTINT (w->last_point_x, FRAME_CURSOR_X (selected_frame));
      XSETFASTINT (w->last_point_y, FRAME_CURSOR_Y (selected_frame));
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      if (all_windows)
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	mark_window_display_accurate (FRAME_ROOT_WINDOW (selected_frame), 1);
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      else
	{
	  w->update_mode_line = Qnil;
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	  XSETFASTINT (w->last_modified, BUF_MODIFF (b));
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	  w->window_end_valid = w->buffer;
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