[gnome-shell] ctrlAltTab: don't allow more than one popup

[Ray Strode <halfline src gnome org>]

commit 2b2a8b47479f2d64ae17ff9b3ed22fe0cc7cd6f4
Author: Ray Strode <rstrode redhat com>
Date:   Sat Sep 17 17:09:47 2011 -0400

    ctrlAltTab: don't allow more than one popup
    
    In a normal user session you can't have more than one
    popup, because the popup is modal and we don't allow
    the popup to show up when there are other modals.
    
    In a GDM session, however, the login dialog is modal, and
    we want a popup, so we don't have that same check.
    
    This commit changes the ctrlAltTab manager code to not
    allow multiple popups.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=659177

 js/ui/ctrlAltTab.js |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/ctrlAltTab.js b/js/ui/ctrlAltTab.js
index d0845a3..59d1a5e 100644
--- a/js/ui/ctrlAltTab.js
+++ b/js/ui/ctrlAltTab.js
@@ -123,7 +123,16 @@ CtrlAltTabManager.prototype = {
             return;
 
         items.sort(Lang.bind(this, this._sortItems));
-        new CtrlAltTabPopup().show(items, backwards);
+
+        if (!this._popup) {
+            this._popup = new CtrlAltTabPopup();
+            this._popup.show(items, backwards);
+
+            this._popup.actor.connect('destroy',
+                                      Lang.bind(this, function() {
+                                          this._popup = null;
+                                      }));
+        }
     }
 };