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Psychotoxical
0992113269
Rapid skipping while a track is in initial preparation produced a
misleading "Couldn't play track — skipping" toast for the abandoned
track. Sequence: audio_play(A) reaches build_source_from_play_input;
user skips → audio_play(B) bumps gen; A's RangedHttpSource::read sees
the gen mismatch and returns Ok(0); Symphonia's probe interprets Ok(0)
as EOF → "ranged-stream: format probe failed: end of stream";
audio_play(A)'s map_err emits audio:error unconditionally → toast
appears even though playback already moved on.
Gate the emit on a generation check: if the global generation has
already moved past this play's gen, the failure is supersedion, not a
real codec error — log it but do not surface the toast.
Pre-existing bug, identical code path on main (commands.rs:600). Noticed
on refactor/backend-pilot during cucadmuh's skip-test session because
the live-test pattern hit the narrow probe-window race repeatedly.
The diagnostic logs added in the previous commit should make the next
occurrence's cause visible regardless of whether the toast fires.
Frontend impact:
- handleAudioError no longer fires on supersedion → no toast, no
setState({ isPlaying: false }), no queued next() call.
- The audio_play IPC promise still rejects with the same error string
(preserved as the .map_err return value); the JS .catch is already
generation-guarded in playerStore so this is a no-op there.