@Override
	public Icon getActionIcon() {
		return DEFAULT_ICON;
	}
A layout provider that works on {@link JungDirectedVisualGraph}s.  This class allows the 
Jung layouts to be used where {@link VisualGraph}s are used.

@param <V> the vertex type
@param <E> the edge type
@param <G> the graph type
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/layout/JungLayoutProvider.java