Blender Git Loki

Fix T85824: Transition between adjustment regression

When transition effect is placed between 2 adjustment layer strips,
only first adjustment layer was rendered by effect.

Limit timeline_frame range to adjustment strip frame range.

This timeline configuration is technically invalid, because strips
should overlap when using transition effect. This was never restricted
and instead of producing no image, transition effect used first and
last frame of source strip. Many users got used to this "feature" so
I think it make sense to fix this case so it behaves like other strip
types.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D10562