Addon Manager does not understand renaming an addon

Recently I added Assembly4 workbench:
I initially added it as 'A4': 6914f4874bd7227082d799a873fa87aa880ddd1c
and then reverted: dacf4084d43373c0520d708c8fe1af0a1d77e91c
(didn't remove the `A4/` directory though)
then I re-added the workbench as Assembl4: 321fcde29d97c1e1d7088de84aa35de0a93a9bb3
Later, kkremitzki removed the A4/ dir in: 4c2d603087a302800eec48576bc36b5969fbeb49

This caused some issues downstream for FC users:
https://forum.freecadweb.org/viewtopic.php?f=4&t=39945

We may need logic in the FC Addon Manager that removes/modifies local ~/.FreeCAD/Mod/ subdirectories if their upstream has changes as well.

@yorikvanhavre just recently added a fix: https://github.com/FreeCAD/FreeCAD/commit/f66023a646
~~Not sure if this takes care of the issue.~~
Edit: the fix doesn't address the above issue