Merge remote-tracking branch 'remotes/upstream/MP1-2564-Background_music_to_slide_show_or_video_to_music_can_hang_MP_wrong_behaviour' into 1.6.0Fork-BDJ
MP1-4327 : Fix for FastSwitch after hold/press too fast Page_UP or Page_DOWN key when changing Vis.
Merge remote-tracking branch 'remotes/upstream/MP1-4327-BUG-Fast_switching_visualization_can_lead_to_crash' into 1.6.0Fork-BDJ