Blender Git Loki

Fix T65640: Axis of Custom Shape Bones are drawn in a wrong position.

The problem is that Custom Shape Bones can also have a custom size.
So the pchan->disp_mat doesn't always consider the actual length of the bone.
The proposed solution is to calculate the axes matrix at the drawing pass.

Ref T65640

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D5049