Blender Git Commit Log

Two threading issues:

- Drawing masks in image editor requires LOCK_DRAW_IMAGE around
ED_space_image_get* functions since they'll acquire image buffer.

Lock is needed because viewers will be modified directly in
compositor (see commend in draw_image_main)

- Seems that was wrong order of invalidating render result and
viewer image invalidation happened in Composite node, which
could easily lead to thread lock.