@Nullable
	public InheritanceGraph getCurrentWorkspaceInheritanceGraph() {
		if (!workspaceManager.hasCurrentWorkspace())
			return null;

		if (currentWorkspaceGraph == null) {
			InheritanceGraph graph = newInheritanceGraph(workspaceManager.getCurrent());
			mappingListeners.addMappingApplicationListener(graph);
			currentWorkspaceGraph = graph;
		}

		return currentWorkspaceGraph;
	}
@return Inheritance graph model for the {@link WorkspaceManager#getCurrent() current workspace}
or {@code null} if no workspace is currently open.
recaf-core/src/main/java/software/coley/recaf/services/inheritance/InheritanceGraphService.java