Solution is actually very simple, and even makes existing code simpler: just write all lib IDs when storing and undo step. That way we do not have to guess which indirectly used library should be kept or not after an undo step reading.
Solution is actually very simple, and even makes existing code simpler: just write all lib IDs when storing and undo step. That way we do not have to guess which indirectly used library should be kept or not after an undo step reading.