protected FGVertex getFocusVertex(final FunctionGraph functionGraph) {
		final FGVertex[] box = new FGVertex[1];
		runSwing(() -> box[0] = functionGraph.getFocusedVertex());
		return box[0];
	}
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