Re: [w3c/webcomponents] Should host with `delegatesFocus` true keep the previous focused element focused if it's a shadow-including descendant of the host? (#840)

Hm... that might be annoying behavior for users though. If page's script kept focusing a component, it would always reset the focus in the component.

I guess the current processing model returns early if the current focus is already at where `focus()` is called: https://html.spec.whatwg.org/multipage/interaction.html#focus-processing-model so maybe we need an equivalent check for shadow hosts so that if you'd call focus() on an already focused shadow host, then we'd just simply return early.

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