Blender Git Loki

Fix T49656: Crash when starting playback while using JACK audio with A/V sync

When ED_screen_animation_play is called from wm_event_do_handlers,ScrArea *sa = CTX_wm_area(C); is NULL in ED_screen_animation_timer.
Informing the audio system in CTX_data_main_set, that a new Main has been set.