Small and dumb, but really useful.
Click on the new Show Links icon on view toolbar or choose View->Show links.
Drawing tree entries will shift right revealing space for link arrows. Now click on the arrows (or arrows space) to choose link source.
If geometry object is clicked, mops and parts using this geometry are shown.
If Layer is clicked, all objects from layer used in mops are shown + affected mops and parts.
If MOP is clicked, assigned objects and their layers are shown
If Part is clicked, all objects used in contained mops are shown + layers.
Layers and Machining may be clicked too, showing the links for all layers or all parts.
The boundaries ids for 3dprofile mops are treated as primitives and linked too.
If link source is MOP/Part, they would be checked for link errors.
If there are any missing primitives or no primitives assigned, a little warning exclamation sign would be drawn next to the link.
Plugin is click-driven and will update links only after a click, so it won't notice any changes in objects/mops including addition and deletion. In some cases (calling undo or loading new file) CB will regenerate the tree completely, forcing it to lose all arrows. Just click to redraw, it is easy )
