Strip was flagged for deletion in `seq_transform_handle_overwrite()`
on `STRIP_OVERLAP_IS_FULL`. Then it is removed in
`SEQ_edit_strip_split()` before it should be.
Handle `STRIP_OVERLAP_IS_FULL` in separate loop.
This may not be complete solution, because in example file overlap is
caused between 2 transformed strips and one that is "static".
Such operation should not be possible in first place. This fixes the
crash at lest, so improvement in behavior can be handled separately.
Differential Revision: https://developer.blender.org/D12751
2561145da8