private void clearMap(ObjectPropertyMap<SaveablePoint> propertyMap,
			FunctionGraph functionGraph) {
		if (propertyMap == null) {
			return; // nothing to do
		}

		Graph<FGVertex, FGEdge> graph = functionGraph;
		Collection<FGVertex> vertices = graph.getVertices();
		for (FGVertex vertex : vertices) {
			AddressSetView codeBlock = vertex.getAddresses();
			Address minAddress = codeBlock.getMinAddress();
			propertyMap.remove(minAddress);
		}
	}
Clears all vertex locations (including group vertex locations).
@param functionGraph function graph
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FunctionGraphVertexAttributes.java