public boolean isVertexSelected() {
		PickedState<V> pickedVertexState = viewer.getPickedVertexState();
		return pickedVertexState.isPicked(vertex);
	}
A class that knows how and where a given vertex was clicked.  Further, this class knows how 
to get clicked components within a given vertex.

@param <V> the vertex type
@param <E> the edge type
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/event/mouse/VertexMouseInfo.java