@Override
	public void execute(GraphJobListener listener) {
		try {
			controller.ungroupAllVertices();
		}
		finally {
			isFinished = true;
			listener.jobFinished(this);
		}
	}
A dummy job that is designed to simply call the {@link FGController#ungroupAllVertices()}.  
We use this job to know when the previous job is finished.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/util/job/UngroupAllVertexFunctionGraphJob.java