(Fset_buffer_modified_p): Set buffer's

prevent_redisplay_optimizations_p flag.

2 files changed, 7 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 2130b169cda..7ace1db772e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,8 @@
 2001-01-16  Gerd Moellmann  <gerd@gnu.org>
 
+        * buffer.c (Fset_buffer_modified_p): Set buffer's
+        prevent_redisplay_optimizations_p flag.
+
         * dispnew.c, callproc.c, fns.c, keyboard.c, process.c, sunfns.c,
         * sysdep.c, vmsproc.c, xselect.c: Call
         redisplay_preserve_echo_area with additional arg.
diff --git a/src/buffer.c b/src/buffer.c
index e3f769ab41b..f019863e80b 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -894,7 +894,10 @@ A non-nil FLAG means mark the buffer modified.")
   XSETBUFFER (buffer, current_buffer);
   window = Fget_buffer_window (buffer, Qt);
   if (WINDOWP (window))
-    update_mode_lines++;
+    {
+      ++update_mode_lines;
+      current_buffer->prevent_redisplay_optimizations_p = 1;
+    }
   
   return flag;
 }