protected FGPrimaryViewer getPrimaryGraphViewer() {
		FGComponent component = getGraphComponent();
		if (component == null) {
			return null; // this will be null if the graph has been disposed
		}

		assertNotNull("FG GraphComponent should not be null", component);
		return (FGPrimaryViewer) getInstanceField("primaryViewer", component);
	}
Added this method for cache testing.  No blocks were needed, just needed another
function to have enough to test a function being removed from the cache.
Ghidra/Features/FunctionGraph/src/test.slow/java/ghidra/app/plugin/core/functiongraph/AbstractFunctionGraphTest.java