[css-highlights-api] Restore check that range is in same document as the HighlightRegistry #6585
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This check was removed in 7e65e38, but it's still needed per the resolution of #6417, which was that we should not paint ranges from documents other than the one associated with the current highlight registry.
This is separate from the validity question, because a range in a different document can be valid (or it could be a live range), but we still shouldn't paint it.