Re: [whatwg/dom] Shadow: Update the behavior of event dispatch when target and related… (#336)

> Do not dispatch an event when retargeted-target and
retargeted-reletedTarget are identical, but target and relatedTarget are
not identical.

This has the same issue as the one I pointed out in https://github.com/w3c/webcomponents/issues/577.  In general, you can't just compare *target* and *related target* or their retargeted counterparts.  You need to look at whether we're crossing the shadow tree, and if both *target* and *related target* are in shadow tree from which we're exiting.

For example, it's perfectly fine to dispatch an event with target & related target to be identical, and the event MUST be dispatched.  This is the existing behavior of event dispatching and we can't change that for backwards compatibility reasons.

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