[mutter] screen: Name the guard window

[Colin Walters <walters src gnome org>]

commit 656d079ffcde8b288d7c1d3694178911001e85c8
Author: A. Walton <awalton gnome org>
Date:   Wed Oct 16 22:39:21 2013 -0400

    screen: Name the guard window
    
    So that extensons can recognize it, for the case where they
    want to watch the window list.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710346

 src/core/screen.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index 5efc65a..c0ec71d 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -476,6 +476,9 @@ create_guard_window (Display *xdisplay, MetaScreen *screen)
                   CWEventMask|CWOverrideRedirect|CWBackPixel,
                   &attributes);
 
+  /* https://bugzilla.gnome.org/show_bug.cgi?id=710346 */
+  XStoreName (xdisplay, guard_window, "mutter guard window");
+
   {
     unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
     XIEventMask mask = { XIAllMasterDevices, sizeof (mask_bits), mask_bits };