private void saveExternalAddConflict(ExternalLocation latestExternalLocation,
			ExternalLocation myExternalLocation, TaskMonitor monitor) {
		// save my added external ID and matching latest external ID in a hash map.
		long myID = myExternalLocation.getSymbol().getID();
		long latestID = latestExternalLocation.getSymbol().getID();
		externalAddConflicts.put(myID, latestID);
	}
If there is an external add conflict, but it is between a new external function versus a
new external data label, we don't want to give the user the KeepBoth or MergeBoth options.
@param latestExternalLocation the external location in the Latest program
@param myExternalLocation the external location in the My program
@param monitor a status monitor for feedback and cancelling.
@return true if this is an external function versus external data label.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/listing/ExternalFunctionMerger.java