Minor optimization of the "abort redisplay" feature

* src/xdisp.c (init_iterator, set_iterator_to_next)
(redisplay_internal):
* src/syntax.c (scan_sexps_forward):
* src/regex-emacs.c (re_match_2_internal):
* src/bidi.c (bidi_fetch_char, bidi_paragraph_init)
(bidi_find_bracket_pairs, bidi_find_other_level_edge): Don't call
'update_redisplay_ticks' if aborting too-long redisplay is
disabled.  (Bug#45898)

4 files changed, 14 insertions, 11 deletions

diff --git a/src/bidi.c b/src/bidi.c
index 267b62fb0bc..c4d04136e9e 100644
--- a/src/bidi.c
+++ b/src/bidi.c
@@ -1281,7 +1281,7 @@ bidi_fetch_char (ptrdiff_t charpos, ptrdiff_t bytepos, ptrdiff_t *disp_pos,
          tuned.  It means we consider 100 buffer positions examined by
          the above call roughly equivalent to the display engine
          iterating over a single buffer position.  */
-      if (*disp_pos > charpos)
+      if (max_redisplay_ticks > 0 && *disp_pos > charpos)
         update_redisplay_ticks ((*disp_pos - charpos) / 100 + 1, w);
     }
 
@@ -1391,7 +1391,7 @@ bidi_fetch_char (ptrdiff_t charpos, ptrdiff_t bytepos, ptrdiff_t *disp_pos,
       SET_TEXT_POS (pos, charpos + *nchars, bytepos + *ch_len);
       *disp_pos = compute_display_string_pos (&pos, string, w, frame_window_p,
                                               disp_prop);
-      if (*disp_pos > charpos + *nchars)
+      if (max_redisplay_ticks > 0 && *disp_pos > charpos + *nchars)
         update_redisplay_ticks ((*disp_pos - charpos - *nchars) / 100 + 1, w);
     }
 
@@ -1822,7 +1822,7 @@ bidi_paragraph_init (bidi_dir_t dir, struct bidi_it *bidi_it, bool no_default_p)
      roughly equivalent to the display engine iterating over a single
      buffer position.  */
   ptrdiff_t nexamined = bidi_it->charpos - pos + nsearch_for_strong;
-  if (nexamined > 0)
+  if (max_redisplay_ticks > 0 && nexamined > 0)
     update_redisplay_ticks (nexamined / 50, bidi_it->w);
 }
 
@@ -2825,7 +2825,7 @@ bidi_find_bracket_pairs (struct bidi_it *bidi_it)
      means we consider 20 buffer positions examined by this function
      roughly equivalent to the display engine iterating over a single
      buffer position.  */
-  if (n > 0)
+  if (max_redisplay_ticks > 0 && n > 0)
     update_redisplay_ticks (n / 20 + 1, bidi_it->w);
   return retval;
 }
@@ -3436,7 +3436,7 @@ bidi_find_other_level_edge (struct bidi_it *bidi_it, int level, bool end_flag)
          tuned.  It means we consider 50 buffer positions examined by
          the above call roughly equivalent to the display engine
          iterating over a single buffer position.  */
-      if (bidi_it->charpos > pos0)
+      if (max_redisplay_ticks > 0 && bidi_it->charpos > pos0)
         update_redisplay_ticks ((bidi_it->charpos - pos0) / 50 + 1, bidi_it->w);
     }
 }
diff --git a/src/regex-emacs.c b/src/regex-emacs.c
index 4d87418eeaf..9b2c14c413d 100644
--- a/src/regex-emacs.c
+++ b/src/regex-emacs.c
@@ -4217,7 +4217,7 @@ re_match_2_internal (struct re_pattern_buffer *bufp,
              means we consider 50 buffer positions examined by this function
              roughly equivalent to the display engine iterating over a single
              buffer position.  */
-          if (nchars > 0)
+          if (max_redisplay_ticks > 0 && nchars > 0)
             update_redisplay_ticks (nchars / 50 + 1, NULL);
           return dcnt;
         }
@@ -5087,7 +5087,7 @@ re_match_2_internal (struct re_pattern_buffer *bufp,
   unbind_to (count, Qnil);
   SAFE_FREE ();
 
-  if (nchars > 0)
+  if (max_redisplay_ticks > 0 && nchars > 0)
     update_redisplay_ticks (nchars / 50 + 1, NULL);
 
   return -1;                            /* Failure to match.  */
diff --git a/src/syntax.c b/src/syntax.c
index c13a8179ee4..15625b4d0e2 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3481,7 +3481,7 @@ do { prev_from = from;				\
      means we consider 10 buffer positions examined by this function
      roughly equivalent to the display engine iterating over a single
      buffer position.  */
-  if (from > started_from)
+  if (max_redisplay_ticks > 0 && from > started_from)
     update_redisplay_ticks ((from - started_from) / 10 + 1, NULL);
 }
 
diff --git a/src/xdisp.c b/src/xdisp.c
index 886c3f4ecbf..cbe6feeae48 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -3231,7 +3231,8 @@ init_iterator (struct it *it, struct window *w,
 
   it->cmp_it.id = -1;
 
-  update_redisplay_ticks (0, w);
+  if (max_redisplay_ticks > 0)
+    update_redisplay_ticks (0, w);
 
   /* Extra space between lines (on window systems only).  */
   if (base_face_id == DEFAULT_FACE_ID
@@ -8186,7 +8187,8 @@ void
 set_iterator_to_next (struct it *it, bool reseat_p)
 {
 
-  update_redisplay_ticks (1, it->w);
+  if (max_redisplay_ticks > 0)
+    update_redisplay_ticks (1, it->w);
 
   switch (it->method)
     {
@@ -16925,7 +16927,8 @@ redisplay_internal (void)
 
   /* We're done with this redisplay cycle, so reset the tick count in
      preparation for the next redisplay cycle.  */
-  update_redisplay_ticks (0, NULL);
+  if (max_redisplay_ticks > 0)
+    update_redisplay_ticks (0, NULL);
 
   unbind_to (count, Qnil);
   RESUME_POLLING;