When the compositor is torn down mid-stream (a Gaming↔Desktop switch removes
the virtual output), its PipeWire stream leaves Streaming for Paused rather
than disconnecting. try_latest treated that as Ok(None) ("static desktop —
repeat the last frame"), so the stream froze on the last frame forever and
neither recovery path fired: the capture-loss rebuild keys on Err, and the
session watcher keys on a session-KIND change (a desktop→desktop new KWin
instance is the same kind).
Track the PipeWire stream state via state_changed (a `streaming` flag) and,
in try_latest, surface a sustained non-Streaming state (1.5s grace for a
transient renegotiation blip) as a capture-loss Err — which the encode loop
already handles by rebuilding the pipeline in place. A static desktop stays
Streaming, so no false trigger. Complements the now-default session watcher.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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