@Override
	ListingModel getListingModel(Address address) {

		FGVertex v = getVertex(address);
		if (v != null) {
			return v.getListingModel(address);
		}

		throw new AssertException(
			"Unexpectedly called for an address not contained by my grouped vertex!");
	}
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