Suppressing the dock whenever oskOpen was true, above effectivePinned so
it applied in every state, hid the dock permanently on the device.
oskOpen is not "the keyboard is on screen". GlobalStates' own comment
says squeekboard hides itself whenever input-method focus drops and that
a hold re-asserts it, and the journal shows exactly that: self-showed /
self-hid every couple of seconds, settling at Visible=true with no
keyboard in front of the user. Gating a persistent surface on a flag
that flaps turns a cosmetic overlap into a dock nobody can reach.
The empty-desktop check keeps its oskOpen term, where it always was: a
spuriously-true flag there costs a reveal that was cosmetic anyway,
which is a different price from hiding a pinned dock.
The real signal is the keyboard's exclusive zone, which the compositor
already applies — an unpinned dock declares zone 0 and is placed above
the keyboard for free, the same mechanism that fixed the pill. The
pinned case, where both reserve space and the reservations stack, wants
fixing where the zones are arbitrated.
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