private void notifyLocationFocusChanged(AttributedVertex vertex) {
		AttributedVertex focus =
			vertex instanceof GroupVertex ? ((GroupVertex) vertex).getFirst() : vertex;
		Swing.runLater(() -> listener.locationFocusChanged(focus));
	}
fire and event to say the focused vertex changed
@param vertex the new focused vertex
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/DefaultGraphDisplay.java