Gated on screenLockSecure, the compositor's ack, not on screenLocked. The
request drifts: measured on the phone, `session lock` answered already-locked
while logind reported LockedHint=no and the phone was in use. That is a
shadow copy of state the protocol owns, and a face gated on it would have
been permanently dismissed with nothing on screen to explain why.
No return on unlock. You come back to the clock and summon her if you want
her, rather than finding whatever was left on.
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