Blender Git Loki

Fix T68700: Incorrect 'absolute' timing of animated masks in the Video
Sequence Editor

Code in 'seq_render_mask' will effectively do
BKE_mask_evaluate(mask_temp, mask->sfra + (cfra - fra_offset), true)
where 'fra_offset' is zero for absolute and seq->start for relative.

If we really want the scene's current frame (as advertised) if Mask Time
is set to Absolute (effectively ignoring the Mask Settings start/end) we
need to change the fra_offset from zero to mask->sfra.

Also BKE_animsys_evaluate_animdata should take mask->sfra into account
as well (otherwise mask animation [points] and other animation [e.g.
opacity] will run out of sync)

Reviewers: campbellbarton, ISS

Maniphest Tasks: T68700

Differential Revision: https://developer.blender.org/D5495