- Okey sets the border in the display. - Okey resets the frame offset in the sequencer timeline. - ghost icon in the header can enable/disable. - frame offset can be relative or absolute (lock icon) Not very happy that this commit adds a call to BKE_animsys_evaluate_animdata(scene, ...) in do_build_seq_array_recursively() without this the offset frames dont have fcurves applied. Though we will need something like this for prefetch frames to work too.