private void notifySelectionChanged(Set<AttributedVertex> selected) {
		// replace any group vertices with their individual vertices.
		Set<AttributedVertex> flattened = GroupVertex.flatten(selected);
		Swing.runLater(() -> listener.selectionChanged(flattened));
	}
fire an event to notify the selected vertices changed
@param selected the list of selected vertices
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/DefaultGraphDisplay.java