private Collection<DataType> filterOutNonSourceSettableDataTypes(
			Collection<DataType> datatypes) {

		List<DataType> filteredList = new ArrayList<>();
		for (DataType dataType : datatypes) {
			if (isSourceSettable(dataType)) {
				filteredList.add(dataType);
			}
		}
		return filteredList;
	}
Allow extensions to perform any necessary fixups for all datatype removals listed.
@param deletedIds list of IDs for all datatypes which are getting removed.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/DataTypeManagerDB.java