public VisualizationViewer<V, E> getViewer(MouseEvent e) {
		VisualizationViewer<V, E> viewer = getGraphViewer(e);
		return viewer;
	}
Graph mouse plugin base class.

Usage Notes:
<ul>
		<li>We clear state on mouseReleased() and mouseExited(), since we will get 
			at least one of those calls</li>
</ul>
@param <V> the vertex type
@param <E> the edge type
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/mouse/AbstractJgtGraphMousePlugin.java