The connect route has always made the same-host exception the deep-link
spec demands (rule 2: streaming the same host -> no-op focus), but the
browse route refused on ANY live session -- so tapping a Dock library
shortcut to come back to a running stream popped "Can't open: Already
streaming X. End that session first." for the very host on glass.
Mirror the connect guard: same host -> the open already foregrounded the
app, which is all focus can mean mid-stream; a different host keeps the
notice. Android shipped this posture from day one; this is Apple parity.
enricobuehler