Step 8 of the renderer-engine extraction — the payoff of sharing. A recording
MockRendererEngine drives the renderer orchestration end-to-end, proving the
hard-won behavior is engine-independent (any future Slint regression is a wiring
bug in its trait impl, not a re-derivation bug in the shared logic). This logic
previously could only be exercised through the Tauri adapter.
Six scenarios:
- load dedup window: two ensure_remote_track_loaded for the same track within
5s -> start_track_stream once; no reload when track_id unchanged.
- #387 echo-seek: same-track SetState at <=1s while local is ahead -> seek
rejected; a genuine far seek IS honored.
- stale-projected-track guard: state-only SetState (command.current_track=None)
-> no align / no load from renderer_state's stale track; pause still applied.
- shuffle deferral: first event (shuffle_mode=true, order=None) -> shuffle_enabled
false (no invented identity order); second event with order -> enabled.
qconnect-app 38 -> 44 tests; all green, no warnings.
cc
vicrodh
37cd1b154b