Index: mivaltree.c
===================================================================
RCS file: /cvs/xorg/xserver/xorg/mi/mivaltree.c,v
retrieving revision 1.6
diff -u -p -u -r1.6 mivaltree.c
--- mivaltree.c	3 Jul 2005 07:01:51 -0000	1.6
+++ mivaltree.c	16 Dec 2005 22:35:18 -0000
@@ -493,7 +493,14 @@ miComputeClips (
      * new, just as for the border.
      */
 
-    if (oldVis == VisibilityFullyObscured ||
+    /* For composite this optimization is incorrect since
+     * the window should not in fact be exposed just because it
+     * was FullyObscured before.
+     */
+    if (
+#ifndef COMPOSITE
+    oldVis == VisibilityFullyObscured ||
+#endif
 	oldVis == VisibilityNotViewable)
     {
 	REGION_COPY( pScreen, &pParent->valdata->after.exposed, universe);