jQuery.ui.widget memory leak

by Yoshiharu Kamata

HTML

<script src="https://raw.github.com/jquery/jquery-ui/master/ui/jquery.ui.core.js"></script>
<script src="https://raw.github.com/jquery/jquery-ui/master/ui/jquery.ui.widget.js"></script>
<div id="container">loading...</div>
<div id="console"></div>

JavaScript

(function($,undefined){
    $.Widget.prototype._bind =function( element, handlers ) {
        // no element argument, shuffle and use this.element
        if ( !handlers ) {
            handlers = element;
            element = this.element;
        } else {
            // accept selectors, DOM elements
            element = $( element );
            this.bindings = this.bindings.add( element );
        }

        var instance = this;
        $.each( handlers, function( event, handler ) {
            function handlerProxy() {
                // allow widgets to customize the disabled handling
                // - disabled as an array instead of boolean
                // - disabled class as method for disabling individual parts
                if ( instance.options.disabled === true ||
                        $( this ).hasClass( "ui-state-disabled" ) ) {
                    return;
                }
                return ( typeof handler === "string" ? instance[ handler ] : handler )
                    .apply( instance, arguments );
                /*if( typeof handler === "string" ){
                    return(instance[ handler ]());
                }else{
                   return(handler.apply( instance, arguments ));
                }*/
            }
            var match = event.match( /^(\w+)\s*(.*)$/ ),
                eventName = match[1] + "." + instance.widgetName,
                selector = match[2];
            if ( selector ) {
                instance.widget().delegate( selector, eventName, handlerProxy );
            } else {
                element.bind( eventName, handlerProxy );
            }
        });
    };

})(jQuery);

// test code
(function($,undefined){
  var count = 0;
  $.widget("ui.dummy",{
    _destroy: function(){
      $("#console").text("call destroy:"+count++);
//      $.Widget.prototype.destroy.call( this );
    }
  });
})(jQuery);
setInterval(function(){
  $("#container")
      .empty()
      .append("<div...