private FGVertex getVertex(Address a) {
		Set<FGVertex> vertices = groupVertex.getVertices();
		for (FGVertex v : vertices) {
			if (v.containsAddress(a)) {
				return v;
			}
		}
		return null;
	}
A bit of a hack that triggers the text area to update its preferred height now before we
render so that it doesn't change later.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/GroupedFunctionGraphComponentPanel.java