private Set<AttributedVertex> getUnselectedTargetVerticesFromSelected() {
		MutableSelectedState<AttributedVertex> selectedVertexState =
			viewer.getSelectedVertexState();
		return getTargetVerticesFromSelected().stream()
				.filter(v -> !selectedVertexState.isSelected(v))
				.collect(Collectors.toSet());
	}
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