public DataType findOriginalDataTypeFromMyID(long myId) {
		Long originalId = dataTypeIDMap.getOriginalIDFromViewID(myId);
		return originalId != null ? originalDTM.getDataType(originalId) : null;
	}
Find a resolved DB-datatype within the original datatype manager based upon a resolved 
datatype's ID within this manager. This method is useful when attempting to matchup a 
datatype within this manager to one which has possibly changed within the original 
datatype manager.

@param myId resolved datatype ID within this datatype manager
@return matching DB-datatype or null if not found
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/CompositeViewerDataTypeManager.java