Don't count ticks too eagerly in syntax.c

* src/syntax.c (scan_sexps_forward): Don't increment redisplay
tick count of the loop didn't advance at all.

diff --git a/src/syntax.c b/src/syntax.c
index de9193e2deb57387a92a523ac1b64c29d9ecdc97..c13a8179ee45b2ab1ba4adecc146b04e7b8c73c5 100644 (file)
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3481,7 +3481,8 @@ 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.  */
-  update_redisplay_ticks ((from - started_from) / 10 + 1, NULL);
+  if (from > started_from)
+    update_redisplay_ticks ((from - started_from) / 10 + 1, NULL);
 }
 
 /* Convert a (lisp) parse state to the internal form used in