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

…Target are identical

Change the behavior of event dispatch as follows:

1. Make an event dispatch happen until the root of the tree when target
and relatedTarget are identical in synthetic events.

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

(2) is a bug fix. This sitution happens in UA events. For example,
if a mouse pointer moves from an element in a shadow tree to
its shadow host, a "mouseover" event should not be dispatched on the
shadow host. The current spec allows a non-empty event path in this case.

Fixes https://github.com/w3c/webcomponents/issues/577
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/336

-- Commit Summary --

  * Shadow: Update the behavior of event dispatch when target and relatedTarget are identical

-- File Changes --

    M dom.bs (47)
    M dom.html (43)

-- Patch Links --

https://github.com/whatwg/dom/pull/336.patch
https://github.com/whatwg/dom/pull/336.diff

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