private void updateDefaultBackgroundColor() {
		FunctionGraphOptions options = controller.getFunctionGraphOptions();
		Color newBgColor = options.getDefaultGroupBackgroundColor();
		if (!defaultBackgroundColor.equals(newBgColor)) {
			defaultBackgroundColor = newBgColor;
			if (userDefinedColor == null) {
				doSetBackgroundColor(defaultBackgroundColor);
			}
		}
	}
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