[gnome-shell] modalDialog: remove old actions from _actionKeys in setButtons

[Maxim Ermilov <mermilov src gnome org>]

commit 0310f07eab6aae46287a2a85e48873f229e85f51
Author: Maxim Ermilov <zaspire rambler ru>
Date:   Mon Jan 31 02:15:19 2011 +0300

    modalDialog: remove old actions from _actionKeys in setButtons
    
    https://bugzilla.gnome.org/show_bug.cgi?id=640781

 js/ui/modalDialog.js |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/modalDialog.js b/js/ui/modalDialog.js
index fee6266..45a1e3c 100644
--- a/js/ui/modalDialog.js
+++ b/js/ui/modalDialog.js
@@ -84,6 +84,8 @@ ModalDialog.prototype = {
 
     setButtons: function(buttons) {
         this._buttonLayout.destroy_children();
+        this._actionKeys = {};
+
         let i = 0;
         for (let index in buttons) {
             let buttonInfo = buttons[index];