An appropriate willConnectTo method to set up for multi-scene usage. State restoration needs additional work

SceneDelegate_snippet.swift

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        
        // Use a UIHostingController as window root view controller
        guard let scene = scene as? UIWindowScene else { return assertionFailure() }
        let window = UIWindow(windowScene: scene)
        configure(
            window: window,
            activity: connectionOptions.userActivities.first ?? session.stateRestorationActivity)
        self.window = window
        window.makeKeyAndVisible()
    }