[gnome-shell] popMenu: Fix invalid allocation

[Lionel Landwerlin <llandwerlin src gnome org>]

commit 185152a74ad8499be14d1d9878018bd544a38b66
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Thu Jul 18 11:11:48 2013 +0100

    popMenu: Fix invalid allocation
    
    https://bugzilla.gnome.org/show_bug.cgi?id=704453

 js/ui/popupMenu.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/popupMenu.js b/js/ui/popupMenu.js
index 53f9a31..45cfa45 100644
--- a/js/ui/popupMenu.js
+++ b/js/ui/popupMenu.js
@@ -313,7 +313,7 @@ const PopupBaseMenuItem = new Lang.Class({
                 availWidth = box.x2 - x;
             } else {
                 if (this._columnWidths)
-                    availWidth += this._columnWidths[col++];
+                    availWidth = this._columnWidths[col++];
                 else
                     availWidth = naturalWidth;
             }