Re: [w3c/webcomponents] The get-the-parent algorithm shouldn't return null until we reach the root of the current tree (#577)

Yes, the one in shadow DOM spec has the step to *trim* the event path when we've reached a point where both the target and the related target reach the same tree so that e.g. `blur` dispatched inside a shadow tree in response to another element in the same tree getting `focus` would not propagate beyond that tree.  Otherwise, you get a superfluous blur & focus pair which indicates the focus moved to the same element which lost the focus.

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