[gtk+] Don't crash if inhibit is called with an unrealized window

[William Jon McCann <mccann src gnome org>]

commit 8e96488bb29dc51315680d3745f945be19a03fc1
Author: William Jon McCann <jmccann redhat com>
Date:   Fri Feb 15 16:21:09 2013 -0500

    Don't crash if inhibit is called with an unrealized window

 gtk/gtkapplication.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkapplication.c b/gtk/gtkapplication.c
index bbb65b8..9072907 100644
--- a/gtk/gtkapplication.c
+++ b/gtk/gtkapplication.c
@@ -1418,16 +1418,22 @@ gtk_application_inhibit (GtkApplication             *application,
   GVariant *res;
   GError *error = NULL;
   guint cookie;
-  guint xid;
+  guint xid = 0;
 
   g_return_val_if_fail (GTK_IS_APPLICATION (application), 0);
   g_return_val_if_fail (!g_application_get_is_remote (G_APPLICATION (application)), 0);
   g_return_val_if_fail (application->priv->sm_proxy != NULL, 0);
 
   if (window != NULL)
-    xid = GDK_WINDOW_XID (gtk_widget_get_window (GTK_WIDGET (window)));
-  else
-    xid = 0;
+    {
+      GdkWindow *gdkwindow;
+
+      gdkwindow = gtk_widget_get_window (GTK_WIDGET (window));
+      if (gdkwindow == NULL)
+        g_warning ("Inhibit called with an unrealized window");
+      else
+        xid = GDK_WINDOW_XID (gdkwindow);
+    }
 
   res = g_dbus_proxy_call_sync (application->priv->sm_proxy,
                                 "Inhibit",