2 files changed, 11 insertions, 4 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 21ec98fa217..da0ba4b11f2 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2011-10-28  Chong Yidong  <cyd@gnu.org>
+
+        * xdisp.c (note_mouse_highlight): Fix use of uninitialized var.
+
 2011-10-28  Dan Nicolaescu  <dann@ics.uci.edu>
 
         * window.c (make_window): Initialize phys_cursor_on_p.
diff --git a/src/xdisp.c b/src/xdisp.c
index 0757feed1d9..296b2d13219 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -26835,11 +26835,14 @@ note_mouse_highlight (struct frame *f, int x, int y)
   /* Which window is that in?  */
   window = window_from_coordinates (f, x, y, &part, 1);
 
-  /* If we were displaying active text in another window, clear that.
-     Also clear if we move out of text area in same window.  */
+  /* If displaying active text in another window, clear that.  */
   if (! EQ (window, hlinfo->mouse_face_window)
-      || (part != ON_TEXT && part != ON_MODE_LINE && part != ON_HEADER_LINE
-          && !NILP (hlinfo->mouse_face_window)))
+      /* Also clear if we move out of text area in same window.  */
+      || (!NILP (hlinfo->mouse_face_window)
+          && !NILP (window)
+          && part != ON_TEXT
+          && part != ON_MODE_LINE
+          && part != ON_HEADER_LINE))
     clear_mouse_face (hlinfo);
 
   /* Not on a window -> return.  */