The "power off monitors on lock" path relies on wake handlers
(MouseArea/Keys) at Lock.qml's root Scope, which sit outside the
WlSessionLock surface and never receive input while locked. The feature
only appeared to work on compositors that auto-restore output power on
input; compositors that fully tear down the output (e.g. MangoWC
disable_monitor) leave the screen off until blind-unlock.
Add a seat-level IdleMonitor (wlr idle-notify, surface-independent) in
IdleService that restores monitor power on any keyboard/pointer
activity. Gated on isShellLocked + monitorsOff + the setting, so it is
inert unless that path actually powered the monitors off.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Nachum Barcohen
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