@Override
	public synchronized AddressSetCollection getAddressSetCollectionSinceLastSave() {
		return new SynchronizedAddressSetCollection(this, changedAddrsSinceSave, tmpAddrs);
	}
Construct a new ProgramChangeSet.
@param addrMap the address map.
@param numUndos the number of undo change sets to track.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/ProgramDBChangeSet.java