lots of duplicated events / memory leaks with tabs widget

I've a lot of duplicated events and memory leaks with tabs widget.

An endless growing list of events like:

"remove" on the tabs container

"focusin", "mousedown" and "remove" on the tabs list ...

Some undesirable object references in "bindings", "classesElementLookup" ... which keep alive objects after a remove (memory leaks)

for example: in "tabs.js / function _processTabs", you setup tracked classes like this:

this._addClass( this.anchors, "ui-tabs-anchor" );

but, after in the function "_setupEvents", you get rid of all events with this :

this._off( this.anchors.add( this.tabs ).add( this.panels ) );

but in this case, the function "_untrackClassesElement" will never be triggered ...

and "classesElementLookup" will keep the anchor reference forever

another thing found in the source (small mistake, no consequence but dead code):

file widget.js / function _on :

if ( selector ) {
	delegateElement.on( eventName, selector, handlerProxy );
} else {
	element.on( eventName, handlerProxy );
}

selector is a string, so the if statement will be ever true

should be

if (selector.length)