Prevent sluggish bidi redisplay in small windows.

 src/xdisp.c (MAX_DISP_SCAN): Decrease to 250.  Prevents sluggish
 redisplay in small windows.

2 files changed, 8 insertions, 3 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 97a70e87fcd..78ef2c1c56b 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2011-09-10  Eli Zaretskii  <eliz@gnu.org>
+
+        * xdisp.c (MAX_DISP_SCAN): Decrease to 250.  Prevents sluggish
+        redisplay in small windows.
+
 2011-09-09  Eli Zaretskii  <eliz@gnu.org>
 
         * frame.c (x_report_frame_params): Cast to avoid compiler warnings.
diff --git a/src/xdisp.c b/src/xdisp.c
index 52d88e89521..4d6f7a81cd7 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -3132,9 +3132,9 @@ next_overlay_change (EMACS_INT pos)
 }
 
 /* How many characters forward to search for a display property or
-   display string.  Enough for a screenful of 100 lines x 50
-   characters in a line.  */
-#define MAX_DISP_SCAN 5000
+   display string.  Searching too far forward makes the bidi display
+   sluggish, especially in small windows.  */
+#define MAX_DISP_SCAN 250
 
 /* Return the character position of a display string at or after
    position specified by POSITION.  If no display string exists at or