[patch] Event delegation for mouseenter and mouseleave

[lrbabe]

This patch adds a private "delegate" function used to bypass "withinElement" in case of event delegation and adds an extra test for the event.relatedTarget in liveHandler for the mouseenter and mouseleave events.

[lrbabe]

I've sent a pull request through github. My repository is here: ​http://github.com/lrbabe/jquery/tree/5fd21143b445bb6e814eb6e54783dac71405e524

[john]

Landed the updated version: ​http://github.com/jquery/jquery/commit/d251809912c06478fd0c7711736ef6ea3572723e

I had to do it by hand because there were still some whitespace problems.

Also, in the case where you do:

if ( fn.live === "mouseenter" || fn.live === "mouseleave" ) {

would it be possible to do:

if ( event.relatedTarget ) {

instead? It'd be nice to have this code be generally generic.