d2dc4f8411
As shown in the T68805, non-sized bones (such as the resulting extruded bone) have no direction or orientation. This can be bad for operators like `extrude_move` since the user might want the resulting bone to be aligned with the bone that originated it. The solution here is to get the parent bone orientation in the transform operator if the bone has no size. Differential Revision: https://developer.blender.org/D6486