It's not possible to undo part addition

When you add a library part to a document and then attempt to undo the addition, you end up undoing some earlier operation. It would be nice if undo could be supported (if not, perhaps the next best thing would be to display something like "Undo not supported for part import" or something like that in the Report view and not do anything else).

OS: Ubuntu 20.04.3 LTS (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.20.24436 (Git)
Build type: Debug
Branch: master
Hash: bf527ba5ed9cbde0813e702c2f3793fb55f5be7c
Python version: 3.8.10
Qt version: 5.12.8
Coin version: 4.0.0
OCC version: 7.3.0
Locale: English/United States (en_US)

The issue names no files, tests, or entry points. First reproduce the problem in FreeCAD by adding a library part to a document and invoking undo; done means the part addition is undone without reverting an earlier operation, or the Report view clearly states that undo is unsupported and makes no other change.

Written by the indexing model from the issue text.