Dialog: fix small memory leak when having lot's of instances. Fixes #7793 - Small memory leak in ui dialog.

Author: Florian Gutmann

ui/jquery.ui.dialog.js

@@ -715,12 +715,11 @@ $.extend( $.ui.dialog.overlay, {
 			$( window ).bind( "resize.dialog-overlay", $.ui.dialog.overlay.resize );
 		}
 
-		var $el = ( this.oldInstances.pop() || $( "<div>" ).addClass( "ui-widget-overlay" ) )
-			.appendTo( document.body )
-			.css({
-				width: this.width(),
-				height: this.height()
-			});
+		var $el = ( this.oldInstances.pop() || $( "<div>" ).addClass( "ui-widget-overlay" ) );
+		$el.appendTo( document.body ).css({
+			width: this.width(),
+			height: this.height()
+		});
 
 		if ( $.fn.bgiframe ) {
 			$el.bgiframe();