@Override
		void expandFromContext(VgVertexContext<FcgVertex> context) {
			FcgVertex v = context.getVertex();
			expand(v, direction);
		}
Called when new vertices are added to the graph to ensure that known edges between any
level of the graph get added as the associated vertices are added to the graph.  This
is needed because we don't add all known edges for a single vertex when it is added, as
its associated vertex may not yet be in the graph.   Calling this method ensures that as
vertices appear, the edges are added.

@param newVertices the vertices being added to the graph
@param newEdges the set to which should be added any new edges being added to the graph
Ghidra/Features/GraphFunctionCalls/src/main/java/functioncalls/plugin/FcgProvider.java