modalDialog: remove old actions from _actionKeys in setButtons
https://bugzilla.gnome.org/show_bug.cgi?id=640781
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@ -84,6 +84,8 @@ ModalDialog.prototype = {
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setButtons: function(buttons) {
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this._buttonLayout.destroy_children();
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this._actionKeys = {};
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let i = 0;
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for (let index in buttons) {
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let buttonInfo = buttons[index];
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