public void setProgramHighlight(ProgramSelection highlight) {
		for (FGVertex vertex : getVertices()) {
			vertex.setProgramHighlight(highlight);
		}
	}
Returns any saved location information for the vertices of this graph.  Location information
is saved when users manually move vertices in the graph.

@return any saved location information for the vertices of this graph.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/FunctionGraph.java