61033de969
Root cause is, that reverse playback would not call `BKE_sound_play_scene()`, however `BKE_sound_stop_scene()` was called always. There was some weird logic in `ED_screen_animation_play()` where condition for what sound scene was to be stopped exactly was inverted for sequencer and duplicated for non-sequencer scene. This may also be incorrect if somebody manages to start playback in active scene, then create sequencer scene and stop it there. Fortunately `ScreenAnimData` keeps pointer to scene which started playback, so this is used to also stop the playback. To make this code bit more readable, the function was split into functions starting and stopping the playback, so the logic can also be simplified a bit. Finally, `sound_device_use_end_after()` was modified to do sanity check. If the number of users is already 0, it does nothing and returns. There assertion to catch this in debug builds. Pull Request: https://projects.blender.org/blender/blender/pulls/147613
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