protected GroupedFunctionGraphVertex group(String groupName, FGVertex... vertices) {

		HashSet<FGVertex> set = new HashSet<>();
		for (FGVertex v : vertices) {
			set.add(v);
		}

		pickVertices(set);
		GroupedFunctionGraphVertex groupVertex = group(set, groupName);

		// for debugging
		Object componentPanel = getComponent(groupVertex);
		setInstanceField("title", componentPanel, groupName);

		return groupVertex;
	}
Finds an edge that represents the given edge, which may no longer exist with
the same (==) edge instances.
Ghidra/Features/FunctionGraph/src/test.slow/java/ghidra/app/plugin/core/functiongraph/AbstractFunctionGraphTest.java