private void buildEnumValueMap() {
		if (enumValueMap != null) {
			return;
		}
		Map<Long, Set<String>> map = new HashMap<>();
		populateEnumValueMap(map, root);
		enumValueMap = map;
	}
This method should be invoked following an undo/redo or a transaction rollback situation.
This will notify {@link DataTypeManagerChangeListenerHandler} and its listeners that this 
manager has just been restored (e.g., undo/redo/rollback).
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/DataTypeManagerDB.java