[gnome-shell] windowManager: Make sure to reset the resizePopup after using it

[Jasper St. Pierre <jstpierre src gnome org>]

commit 897144baba90bff8e012c89a0c5b3128dc041ed6
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Jan 2 09:27:52 2015 -0800

    windowManager: Make sure to reset the resizePopup after using it
    
    So that we'll recreate it the next time we want to show it. Otherwise,
    we'll try to call things on a half-destroyed ResizePopup and end up
    causing errors instead of showing the user their resize popup.

 js/ui/windowManager.js |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index 56f33a5..65ec623 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -1561,8 +1561,10 @@ const WindowManager = new Lang.Class({
 
             this._resizePopup.set(rect, displayW, displayH);
         } else {
-            if (this._resizePopup)
+            if (this._resizePopup) {
                 this._resizePopup.destroy();
+                this._resizePopup = null;
+            }
         }
     },
 });