From 1d2a070254a2f01de3202392a8fdb43fc2ee84d2 Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Mon, 25 Nov 2013 21:11:56 +0100
Subject: [PATCH] x11: Don't crash if a window is on an unmanaged screen

_gdk_x11_display_screen_for_xrootwin() can return NULL. If so, return
NULL from gdk_x11_window_foreign_new_for_display().

https://bugzilla.gnome.org/show_bug.cgi?id=709716
---
 gdk/x11/gdkwindow-x11.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index 6ee7a9602f..a8e92b6bec 100644
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -1229,6 +1229,8 @@ gdk_x11_window_foreign_new_for_display (GdkDisplay *display,
     XFree (children);
 
   screen = _gdk_x11_display_screen_for_xrootwin (display, root);
+  if (screen == NULL)
+    return NULL;
 
   win = _gdk_display_create_window (display);
   win->impl = g_object_new (GDK_TYPE_WINDOW_IMPL_X11, NULL);