From c8472a74441838e16d0d3414db1fa7fe996868a9 Mon Sep 17 00:00:00 2001
From: Michael Vogt <michael.vogt@ubuntu.com>
Date: Tue, 25 Nov 2008 19:35:17 +0200
Subject: [PATCH] Do not send VisibilityNotify events when MapUnmapEvents are
 disabled

This prevents a protocol visible side-effect (XVisibilityEvent) on
XCompositeRedirectWindow() followed by a XCompositeUnredirectWindow().

The problem shows up in gnome-screensaver with compiz and "unredirect
fullscreen windows" enable. A VisibilityNotify event is generated (first
with obscured and than with unobscured) when the window swithces from
redirected to unredirected.

https://bugs.freedesktop.org/show_bug.cgi?id=18133
http://launchpad.net/bugs/278112
---
 dix/window.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dix/window.c b/dix/window.c
index ff5ba4acc..c31fa875b 100644
--- a/dix/window.c
+++ b/dix/window.c
@@ -3091,6 +3091,8 @@ void
 SendVisibilityNotify(WindowPtr pWin)
 {
     xEvent event;
+    if (!MapUnmapEventsEnabled(pWin))
+        return;
 #ifndef NO_XINERAMA_PORT
     unsigned int visibility = pWin->visibility;
 #endif