[whatwg/dom] Do not dispatch an UA event when target and relatedTarget are identical. (#337)

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.

This is an unintentional bug, which should be fixed.
See also https://github.com/w3c/webcomponents/issues/577.



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