@Override
	protected void verticesRemoved(Collection<FGVertex> removed) {

		removed.forEach(v -> {
			clearSavedVertexLocation(v);
		});

		super.fireVerticesRemoved(removed);
	}
Any time a vertex is grouped we want to make sure that any previous group affiliations
are removed.

@param groupVertices the new grouping of vertices
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/FunctionGraph.java