[gnome-shell] appDisplay: Fix leaking signal connections

[Adel Gadllah <agadllah src gnome org>]

commit 99af774c9805a47973e40947246c2d9bdd29330f
Author: Michele <micxgx gmail com>
Date:   Wed Mar 4 00:51:19 2015 +0000

    appDisplay: Fix leaking signal connections
    
    The overview has a longer life-time than dash items, so we are leaking a
    signal connection each time an item is destroyed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745570

 js/ui/appDisplay.js |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 9f50558..1df417f 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -1702,7 +1702,10 @@ const AppIcon = new Lang.Class({
                 if (!isPoppedUp)
                     this._onMenuPoppedDown();
             }));
-            Main.overview.connect('hiding', Lang.bind(this, function () { this._menu.close(); }));
+            let id = Main.overview.connect('hiding', Lang.bind(this, function () { this._menu.close(); }));
+            this.actor.connect('destroy', function() {
+                Main.overview.disconnect(id);
+            });
 
             this._menuManager.addMenu(this._menu);
         }