From 7503d4812caf2e6ef772bd13c29ca5c1fd122ad4 Mon Sep 17 00:00:00 2001
From: Dan Winship <danw@gnome.org>
Date: Tue, 29 Mar 2011 15:16:23 -0400
Subject: [PATCH] window: don't crash on spurious calls to idle_calc_showing()

If idle_calc_showing() gets called when its queue is empty (which
shouldn't happen), just return rather than crashing.

https://bugzilla.gnome.org/show_bug.cgi?id=642957
---
 src/core/window.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core/window.c b/src/core/window.c
index 016c48ceb..edb61494e 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -2041,6 +2041,8 @@ idle_calc_showing (gpointer data)
   MetaWindow *first_window;
   guint queue_index = GPOINTER_TO_INT (data);
 
+  g_return_val_if_fail (queue_pending[queue_index] != NULL, FALSE);
+
   meta_topic (META_DEBUG_WINDOW_STATE,
               "Clearing the calc_showing queue\n");