Re: [fullscreen] Inconsistency of condition between entering fullscreen and exiting fullscreen (#6)

OK, so basically eliminating the case where a sibling of an active `<dialog>` goes fullscreen?

If we want this kind of invariant, could it make sense for it to apply to the top layer system as a whole and not just fullscreen? The invariant would be that when adding an element to the top layer, the top layer must either be empty, or its top element must be a non-inclusive ancestor of the element being added.

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