Blender Git Loki

Bugfix [#27194] Difficulty selecting bones with boneshapes enabled and
some bones made un-selectable

Pose Bone selection (like object selection) used OpenGL to draw
wireframes with different colours into an offscreen buffer and then
from that identify which item was clicked on. The bug here was that
unselectable bones were getting drawn for this step too, so they were
getting caught instead of the control bones that were selectable.