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Three index bugs in PlayQueueManager, two of which leave
PlayingItemIndex out of bounds, making every subsequent Buffering/Ready
request throw and leaving the group unusable until it empties:
- RemoveFromPlaylist did not compensate for removed items preceding the
playing item: removing the playing item together with earlier items
could select the wrong item or crash with an out-of-bounds index.
- Next/Previous on an empty playlist with RepeatOne/RepeatAll reported
success or set PlayingItemIndex to 0 on an empty list, crashing
downstream in Group and corrupting the index.
- SetPlayingItemByIndex accepted an index equal to the playlist count
(latent off-by-one, callers currently pre-validate).
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