@Override
	void refreshDisplay() {
		// make sure the title stays up-to-date with the symbol at the start address
		title = createTitle();
		genericHeader.setTitle(title);
		previewListingPanel = null;

		updateDefaultBackgroundColor();
	}
Signals to rebuild this component's data model.  This call should not do any real work
if the model is not 'dirty'.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/ListingGraphComponentPanel.java