Dialog: Make close() a noop if the dialog is already closed. Fixes #7327 - Dialog box size and close animation bugs.

Author: David Murdoch

ui/jquery.ui.dialog.js

@@ -190,20 +190,24 @@ $.widget("ui.dialog", {
 	},
 
 	close: function( event ) {
+		if ( !this._isOpen ) {
+			return self;
+		}
+
 		var self = this,
 			maxZ, thisZ;
 
 		if ( false === self._trigger( "beforeClose", event ) ) {
 			return;
 		}
 
+		self._isOpen = false;
+
 		if ( self.overlay ) {
 			self.overlay.destroy();
 		}
 		self.uiDialog.unbind( "keypress.ui-dialog" );
 
-		self._isOpen = false;
-
 		if ( self.options.hide ) {
 			self.uiDialog.hide( self.options.hide, function() {
 				self._trigger( "close", event );