bff9c9a5a1
This covers a race condition in session transport that when synced to an external engine it sometimes occurs that at the end of ::realtime_stop() ::transport_stopped_or_stopping() returns false when ::setup_rec_box() is called. In this case the rec boxes are not erased when the recoding transport is stopped. This fixes this behavior about the remaining rec boxes, however the race condition remains. The race condition is reported in #8104. It should be considered reverting this commit once the race condition is fixed.
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