private void clearSelection(boolean fireEvents) {
		viewer.getSelectedVertexState().clear(fireEvents);
		viewer.getSelectedEdgeState().clear(fireEvents);
	}
Ungroup the selected vertices. If the focusedVertex is no longer in the graph, null it. This
will happen if the focusedVertex was the GroupVertex
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/DefaultGraphDisplay.java