From f0f39c34f807dcd4775415f1b7604b9debc16c60 Mon Sep 17 00:00:00 2001
From: Xan Lopez <xan@gnome.org>
Date: Tue, 29 Sep 2009 23:45:03 -0400
Subject: [PATCH] Update last_window only when needed

_gtk_tooltip_handle_event, which is called for many events in the GTK+
main loop, calls gtk_tooltip_set_last_window, which keeps a weak
reference to the last window we passed through. If the window being
set is the same than the last one there's really no need to update our
weak reference, so add a check for that and exit early.
---
 gtk/gtktooltip.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gtk/gtktooltip.c b/gtk/gtktooltip.c
index c816d0e7f9..66b29f1b77 100644
--- a/gtk/gtktooltip.c
+++ b/gtk/gtktooltip.c
@@ -768,6 +768,9 @@ static void
 gtk_tooltip_set_last_window (GtkTooltip *tooltip,
 			     GdkWindow  *window)
 {
+  if (tooltip->last_window == window)
+    return;
+
   if (tooltip->last_window)
     g_object_remove_weak_pointer (G_OBJECT (tooltip->last_window),
 				  (gpointer *) &tooltip->last_window);