User: tearing down + recreating the monitor per session is wrong both ways — a
fixed GUID collides on overlapping sessions, but a per-session GUID makes a new
screen on every reconnect; host-lifetime would leave a phantom display for
physical-screen users. Correct model = rock-solid state machine.
Replace the per-session create/REMOVE with a host-level reference-counted
manager (global MGR):
- States: Idle / Active{refs} / Lingering{until}.
- Connect (acquire): Idle→create; Lingering→reuse (cancel teardown, reconfigure
if the mode changed) — the quick-reconnect reuse, no new screen/PnP chime;
Active→refs++ (concurrent / Reconfigure-overlap), reconfigure on a mode change.
- Disconnect (release, via the MonitorLease keepalive Drop): refs-- ; at 0 →
Lingering(now + PUNKTFUNK_MONITOR_LINGER_MS, default 10s).
- Background timer: Lingering past its deadline → REMOVE the monitor → Idle, so a
physical screen returns ~10s after streaming stops.
Eliminates BOTH the cross-session REMOVE collision (teardown only at refs==0 +
expired grace) and the new-screen-on-reconnect, without a persistent phantom
display. The control-device handle is opened once (host-level) — a handle, not a
screen. SudoVdaDisplay is now a marker; the old create() body is create_monitor.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
enricobuehler
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