[gnome-shell] fix "undo remove from favorites"

[Maxim Ermilov <mermilov src gnome org>]

commit 13a117579201a7873601de2398640225638719e9
Author: Maxim Ermilov <zaspire rambler ru>
Date:   Wed Jul 14 05:32:41 2010 +0400

    fix "undo remove from favorites"
    
    In GSettings, a change notification is generated immediately from context of the _set() call.
    In GConf, The "value_changed" signal is emitted whenever the server
    notifies your client program that a value has changed in the database (100% NOT from context of the _set() call).
    https://bugzilla.gnome.org/show_bug.cgi?id=624296

 js/ui/appFavorites.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/appFavorites.js b/js/ui/appFavorites.js
index d916b96..2a20123 100644
--- a/js/ui/appFavorites.js
+++ b/js/ui/appFavorites.js
@@ -100,10 +100,11 @@ AppFavorites.prototype = {
     },
 
     removeFavorite: function(appId) {
+        let app = this._favorites[appId];
         if (!this._removeFavorite(appId))
             return;
 
-        Main.overview.infoBar.setMessage(_("%s has been removed from your favorites.").format(this._favorites[appId].get_name()),
+        Main.overview.infoBar.setMessage(_("%s has been removed from your favorites.").format(app.get_name()),
                                          Lang.bind(this, function () {
             this._addFavorite(appId);
         }));