sizzle setDocument attaches infinite number of unload listeners

[reedz]

Problem description: using jquery to select elements inside an iframe causes setDocument call, which per #14535 attaches an unload event listener.
Whenever it's used from event (e.g. onKeyDown), it may generate big amount of listeners, which will cause bad performance (at ~100 listeners added, adding a new one would cause around 15 ms on IE11)
Browser: IE 9-11
JS fiddle: http://jsfiddle.net/m9yn2t4L/

Possible solution:
replace

parent.addEventListener( "unload", function() {
                setDocument();
            }, false );

with

parent.addEventListener( "unload", setDocument, false );

(listeners not duplicated)

[timmywil]

Thanks for opening an issue. Confirmed.

[timmywil]

Fixed by jquery/sizzle@78a8c3a

[timmywil]

To be closed when Sizzle is updated.

[timmywil]

7602dc7