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While follower mode is on — a video wall follower, or a group-sync member — playCurrentItem() deliberately never calls scheduleAdvance(): the wall/group tick owns the index instead. Leaving that mode cleared the flag but re-armed nothing, so the item already on screen had no timer behind it and the playlist stopped dead. Unchecking "sync" on a group froze every member showing an image, until the app was restarted. A 30-frame sample of a real panel returned exactly one unique frame. Video hid the damage: onVideoComplete() -> next() still fires once repeatMode drops back to OFF, so a video playlist recovers on its own and only images and widgets strand. Both wall and group exit run through setWallFollower(), so the fix belongs there rather than in either controller. The entering edge was wrong in the same way, oppositely: a timer armed by the last playCurrentItem() stayed live across the transition into follower mode and would fire a next() that fights the tick for the index. It is now cancelled. Resume is measured from when the item actually started, so leaving sync 8s into a 10s image advances in ~2s rather than restarting the full slot; an already-elapsed slot yields 0 and the existing MIN_ADVANCE_MS backstop keeps that off a busy loop. FollowerExit is a pure seam so the arithmetic is testable without a Handler. Verified on the panel that reproduced it: "follower mode off — resuming self-advance in 9233ms", same pid, 40 frames / 7 unique / 9 advances where it previously froze. |
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