private GraphViewer<V, E> getPrimaryGraphViewer(Object source) {
		GraphViewer<V, E> primaryGraphViewer = getView().getPrimaryGraphViewer();
		if (source == primaryGraphViewer) {
			return primaryGraphViewer;
		}
		return null;
	}
Reads previously saved state from the given state object

@param saveState the state object that may contain state information for this provider
Ghidra/Framework/Graph/src/main/java/ghidra/graph/VisualGraphComponentProvider.java