public AddressSetView getRestrictedAddressSet() {
		return programDiff.getRestrictedAddressSet();
	}
Return the address set that is currently being used to restrict the
differences that get returned.
@return the address set being used to restrict the Diff results.
The addresses in this set are derived from program1.
Ghidra/Features/Base/src/main/java/ghidra/program/util/ProgramMergeManager.java