dopesheet_draw_region crashes, seems to try to draw just deleted track data.
1) Have VFX->Motion tracking open (movie clip editor and dopesheet open same time)
2) Delete track from movie editor.
version: 2.80 (sub 47), branch: master, commit date: 2019-03-07 14:07, hash: ed24315c6309, type: Debug
build date: 2019-03-07, 16:44:55