Fix crash when opening push notification while VC modally presented

The dismissal of the modally presented VC turns the route change into an
asynchronous operation, even when not animated.

Closes #484

Tusker/AppDelegate.swift

@@ -290,9 +290,10 @@ extension AppDelegate: UNUserNotificationCenterDelegate {
             // if the scene is already active, then we animate the account switching if necessary
             delegate.activateAccount(account, animated: scene.activationState == .foregroundActive)
             
-            rootViewController.select(route: .notifications, animated: false)
+            rootViewController.select(route: .notifications, animated: false) {
-            let vc = NotificationLoadingViewController(notificationID: notificationID, mastodonController: mastodonController)
+                let vc = NotificationLoadingViewController(notificationID: notificationID, mastodonController: mastodonController)
-            rootViewController.getNavigationController().pushViewController(vc, animated: false)
+                rootViewController.getNavigationController().pushViewController(vc, animated: false)
+            }
         } else {
             let activity = UserActivityManager.showNotificationActivity(id: notificationID, accountID: accountID)
             if #available(iOS 17.0, *) {

Tusker/Scenes/MainSceneDelegate.swift

@@ -83,7 +83,9 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
         } else {
             context = ActiveAccountUserActivityHandlingContext(isHandoff: true, root: rootViewController!)
         }
-        _ = userActivity.handleResume(manager: UserActivityManager(scene: scene as! UIWindowScene, context: context))
+        Task(priority: .userInitiated) {
+            _ = await userActivity.handleResume(manager: UserActivityManager(scene: scene as! UIWindowScene, context: context))
+        }
     }
     
     func windowScene(_ windowScene: UIWindowScene, performActionFor shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping (Bool) -> Void) {
@@ -191,8 +193,10 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
             
             if let activity = launchActivity {
                 func doRestoreActivity(context: UserActivityHandlingContext) {
-                    _ = activity.handleResume(manager: UserActivityManager(scene: window!.windowScene!, context: context))
+                    Task(priority: .userInitiated) {
-                    context.finalize(activity: activity)
+                        _ = await activity.handleResume(manager: UserActivityManager(scene: window!.windowScene!, context: context))
+                        context.finalize(activity: activity)
+                    }
                 }
                 if activity.isStateRestorationActivity {
                     doRestoreActivity(context: StateRestorationUserActivityHandlingContext(root: rootViewController!))

Tusker/Screens/Main/AccountSwitchingContainerViewController.swift

@@ -70,10 +70,12 @@ class AccountSwitchingContainerViewController: UIViewController {
                 stateRestorationLogger.debug("AccountSwitchingContainer: reusing existing VC for \(account.id, privacy: .public)")
             } else {
                 newRoot = newRootProvider()
-                stateRestorationLogger.debug("AccountSwitchingContainer: restoring \(activity.activityType, privacy: .public) for \(account.id, privacy: .public)")
+                Task(priority: .userInitiated) {
-                let context = StateRestorationUserActivityHandlingContext(root: newRoot)
+                    stateRestorationLogger.debug("AccountSwitchingContainer: restoring \(activity.activityType, privacy: .public) for \(account.id, privacy: .public)")
-                _ = activity.handleResume(manager: UserActivityManager(scene: view.window!.windowScene!, context: context))
+                    let context = StateRestorationUserActivityHandlingContext(root: newRoot)
-                context.finalize(activity: activity)
+                    _ = await activity.handleResume(manager: UserActivityManager(scene: view.window!.windowScene!, context: context))
+                    context.finalize(activity: activity)
+                }
             }
         } else {
             newRoot = newRootProvider()
@@ -150,9 +152,9 @@ extension AccountSwitchingContainerViewController: TuskerRootViewController {
         root.compose(editing: draft, animated: animated, isDucked: isDucked)
     }
     
-    func select(route: TuskerRoute, animated: Bool) {
+    func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?) {
         loadViewIfNeeded()
-        root.select(route: route, animated: animated)
+        root.select(route: route, animated: animated, completion: completion)
     }
     
     func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController? {

Tusker/Screens/Main/Duckable+Root.swift

@@ -35,8 +35,8 @@ extension DuckableContainerViewController: AccountSwitchableViewController {
         (child as! TuskerRootViewController).getNavigationController()
     }
     
-    func select(route: TuskerRoute, animated: Bool) {
+    func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?) {
-        (child as? TuskerRootViewController)?.select(route: route, animated: animated)
+        (child as? TuskerRootViewController)?.select(route: route, animated: animated, completion: completion)
     }
     
     func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController? {

Tusker/Screens/Main/MainSplitViewController.swift

@@ -542,14 +542,14 @@ extension MainSplitViewController: StateRestorableViewController {
 }
 
 extension MainSplitViewController: TuskerRootViewController {
-    func select(route: TuskerRoute, animated: Bool) {
+    func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?) {
         guard traitCollection.horizontalSizeClass != .compact else {
-            tabBarViewController?.select(route: route, animated: animated)
+            tabBarViewController?.select(route: route, animated: animated, completion: completion)
             return
         }
         guard presentedViewController == nil else {
             dismiss(animated: animated) {
-                self.select(route: route, animated: animated)
+                self.select(route: route, animated: animated, completion: completion)
             }
             return
         }
@@ -575,6 +575,7 @@ extension MainSplitViewController: TuskerRootViewController {
         let oldItem = sidebar.selectedItem
         sidebar.select(item: item, animated: false)
         select(newItem: item, oldItem: oldItem)
+        completion?()
     }
     
     func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController? {

Tusker/Screens/Main/MainTabBarViewController.swift

@@ -289,7 +289,7 @@ extension MainTabBarViewController: StateRestorableViewController {
 }
 
 extension MainTabBarViewController: TuskerRootViewController {
-    func select(route: TuskerRoute, animated: Bool) {
+    func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?) {
         switch route {
         case .timelines:
             select(tab: .timelines, dismissPresented: true)
@@ -310,6 +310,7 @@ extension MainTabBarViewController: TuskerRootViewController {
                 nav.pushViewController(ListTimelineViewController(for: list, mastodonController: mastodonController), animated: animated)
             }
         }
+        completion?()
     }
     
     func getNavigationDelegate() -> TuskerNavigationDelegate? {

Tusker/Screens/Main/TuskerRootViewController.swift

@@ -12,7 +12,7 @@ import ComposeUI
 @MainActor
 protocol TuskerRootViewController: UIViewController, StateRestorableViewController, StatusBarTappableViewController {
     func compose(editing draft: Draft?, animated: Bool, isDucked: Bool)
-    func select(route: TuskerRoute, animated: Bool)
+    func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?)
     func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController?
     func getNavigationDelegate() -> TuskerNavigationDelegate?
     func getNavigationController() -> NavigationControllerProtocol
@@ -21,33 +21,6 @@ protocol TuskerRootViewController: UIViewController, StateRestorableViewControll
     func presentPreferences(completion: (() -> Void)?) -> PreferencesNavigationController?
 }
 
-//extension TuskerRootViewController {
-//    func select(route: NewRoute, animated: Bool) {
-//        doApply(components: route.components, animated: animated)
-//    }
-//
-//    private func doApply(components: ArraySlice<RouteComponent>, animated: Bool) {
-//        guard let first = components.first else {
-//            return
-//        }
-//        doApply(component: first, animated: animated) {
-//            self.doApply(components: components.dropFirst(), animated: animated)
-//        }
-//    }
-//
-//    private func doApply(component: RouteComponent, animated: Bool, completion: @escaping () -> Void) {
-//        switch component {
-//        case .topLevelItem(let rootRoute):
-//            select(route: rootRoute)
-//            completion()
-//        case .popToRoot:
-//            _ = getNavigationController().popToRootViewController(animated: animated)
-//            completion()
-//        case .push(<#T##(MastodonController) -> UIViewController#>)
-//        }
-//    }
-//}
-
 enum TuskerRoute {
     case timelines
     case notifications
@@ -57,33 +30,6 @@ enum TuskerRoute {
     case list(id: String)
 }
 
-//struct NewRoute: ExpressibleByArrayLiteral {
-//    let components: [RouteComponent]
-//
-//    init(arrayLiteral elements: RouteComponent...) {
-//        self.components = elements
-//    }
-//
-//    static var timelines: Self { [.topLevelItem(.timelines)] }
-//    static var explore: Self { [.topLevelItem(.explore)] }
-//    static var myProfile: Self { [.topLevelItem(.myProfile)] }
-//    static var bookmarks: Self { [.topLevelItem(.explore), .push({ BookmarksViewController(mastodonController: $0) })] }
-//    static func profile(accountID: String) -> Self { [.topLevelItem(.timelines), .push({ ProfileViewController(accountID: accountID, mastodonController: $0) })] }
-//}
-//
-//enum RouteComponent {
-//    case topLevelItem(RootRoute)
-//    case popToRoot
-//    case push((MastodonController) -> UIViewController)
-//    case present(UIViewController)
-//}
-//
-//enum RootRoute {
-//    case timelines
-//    case explore
-//    case myProfile
-//}
-//
 @MainActor
 protocol NavigationControllerProtocol: UIViewController {
     var viewControllers: [UIViewController] { get set }

Tusker/Shortcuts/AppShortcutItems.swift

@@ -44,9 +44,9 @@ enum AppShortcutItem: String, CaseIterable {
         }
         switch self {
         case .showHomeTimeline:
-            root.select(route: .timelines, animated: false)
+            root.select(route: .timelines, animated: false, completion: nil)
         case .showNotifications:
-            root.select(route: .notifications, animated: false)
+            root.select(route: .notifications, animated: false, completion: nil)
         case .composePost:
             root.compose(editing: nil, animated: false, isDucked: false)
         }

Tusker/Shortcuts/NSUserActivity+Extensions.swift

@@ -43,9 +43,9 @@ extension NSUserActivity {
     }
     
     @MainActor
-    func handleResume(manager: UserActivityManager) -> Bool {
+    func handleResume(manager: UserActivityManager) async -> Bool {
         guard let type = UserActivityType(rawValue: activityType) else { return false }
-        type.handle(manager)(self)
+        await type.handle(manager)(self)
         return true
     }
     

Tusker/Shortcuts/UserActivityHandlingContext.swift

@@ -16,7 +16,8 @@ import ComposeUI
 protocol UserActivityHandlingContext {
     var isHandoff: Bool { get }
     
-    func select(route: TuskerRoute)
+    func select(route: TuskerRoute) async
+    func select(route: TuskerRoute, completion: (() -> Void)?)
     func present(_ vc: UIViewController)
     
     var topViewController: UIViewController? { get }
@@ -28,6 +29,16 @@ protocol UserActivityHandlingContext {
     func finalize(activity: NSUserActivity)
 }
 
+extension UserActivityHandlingContext {
+    func select(route: TuskerRoute) async {
+        await withCheckedContinuation { continuation in
+            select(route: route) {
+                continuation.resume()
+            }
+        }
+    }
+}
+
 struct ActiveAccountUserActivityHandlingContext: UserActivityHandlingContext {
     let isHandoff: Bool
     let root: TuskerRootViewController
@@ -35,8 +46,8 @@ struct ActiveAccountUserActivityHandlingContext: UserActivityHandlingContext {
         root.getNavigationDelegate()!
     }
     
-    func select(route: TuskerRoute) {
+    func select(route: TuskerRoute, completion: (() -> Void)?) {
-        root.select(route: route, animated: true)
+        root.select(route: route, animated: true, completion: completion)
     }
     
     func present(_ vc: UIViewController) {
@@ -71,9 +82,11 @@ class StateRestorationUserActivityHandlingContext: UserActivityHandlingContext {
     
     var isHandoff: Bool { false }
     
-    func select(route: TuskerRoute) {
+    func select(route: TuskerRoute, completion: (() -> Void)?) {
-        root.select(route: route, animated: false)
+        root.select(route: route, animated: false) {
-        state = .selectedRoute
+            self.state = .selectedRoute
+            completion?()
+        }
     }
     
     var topViewController: UIViewController? { root.getNavigationController().topViewController }

Tusker/Shortcuts/UserActivityManager.swift

@@ -133,8 +133,8 @@ class UserActivityManager {
         return activity
     }
     
-    func handleCheckNotifications(activity: NSUserActivity) {
+    func handleCheckNotifications(activity: NSUserActivity) async {
-        context.select(route: .notifications)
+        await context.select(route: .notifications)
         context.popToRoot()
         if let notificationsPageController = context.topViewController as? NotificationsPageViewController {
             notificationsPageController.loadViewIfNeeded()
@@ -204,22 +204,22 @@ class UserActivityManager {
         return (timeline, positionInfo)
     }
     
-    func handleShowTimeline(activity: NSUserActivity) {
+    func handleShowTimeline(activity: NSUserActivity) async {
         guard let (timeline, positionInfo) = Self.getTimeline(from: activity) else { return }
         
         var timelineVC: TimelineViewController?
         if let pinned = PinnedTimeline(timeline: timeline),
            mastodonController.accountPreferences.pinnedTimelines.contains(pinned) {
-            context.select(route: .timelines)
+            await context.select(route: .timelines)
             context.popToRoot()
             let pageController = context.topViewController as! TimelinesPageViewController
             pageController.selectTimeline(pinned, animated: false)
             timelineVC = pageController.currentViewController as? TimelineViewController
         } else if case .list(let id) = timeline {
-            context.select(route: .list(id: id))
+            await context.select(route: .list(id: id))
             timelineVC = context.topViewController as? TimelineViewController
         } else {
-            context.select(route: .explore)
+            await context.select(route: .explore)
             context.popToRoot()
             timelineVC = TimelineViewController(for: timeline, mastodonController: mastodonController)
             context.push(timelineVC!)
@@ -249,11 +249,11 @@ class UserActivityManager {
         return activity.userInfo?["mainStatusID"] as? String
     }
     
-    func handleShowConversation(activity: NSUserActivity) {
+    func handleShowConversation(activity: NSUserActivity) async {
         guard let mainStatusID = Self.getConversationStatus(from: activity) else {
             return
         }
-        context.select(route: .timelines)
+        await context.select(route: .timelines)
         context.push(ConversationViewController(for: mainStatusID, state: .unknown, mastodonController: mastodonController))
     }
     
@@ -274,8 +274,8 @@ class UserActivityManager {
         return activity.userInfo?["query"] as? String
     }
     
-    func handleSearch(activity: NSUserActivity) {
+    func handleSearch(activity: NSUserActivity) async {
-        context.select(route: .explore)
+        await context.select(route: .explore)
         context.popToRoot()
         
         let searchController: UISearchController
@@ -311,8 +311,8 @@ class UserActivityManager {
         return activity
     }
     
-    func handleBookmarks(activity: NSUserActivity) {
+    func handleBookmarks(activity: NSUserActivity) async {
-        context.select(route: .bookmarks)
+        await context.select(route: .bookmarks)
     }
     
     // MARK: - My Profile
@@ -325,8 +325,8 @@ class UserActivityManager {
         return activity
     }
     
-    func handleMyProfile(activity: NSUserActivity) {
+    func handleMyProfile(activity: NSUserActivity) async {
-        context.select(route: .myProfile)
+        await context.select(route: .myProfile)
     }
     
     // MARK: - Show Profile
@@ -344,11 +344,11 @@ class UserActivityManager {
         return activity.userInfo?["profileID"] as? String
     }
     
-    func handleShowProfile(activity: NSUserActivity) {
+    func handleShowProfile(activity: NSUserActivity) async {
         guard let accountID = Self.getProfile(from: activity) else {
             return
         }
-        context.select(route: .timelines)
+        await context.select(route: .timelines)
         context.push(ProfileViewController(accountID: accountID, mastodonController: mastodonController))
     }
     
@@ -361,11 +361,11 @@ class UserActivityManager {
         return activity
     }
     
-    func handleShowNotification(activity: NSUserActivity) {
+    func handleShowNotification(activity: NSUserActivity) async {
         guard let notificationID = activity.userInfo?["notificationID"] as? String else {
             return
         }
-        context.select(route: .notifications)
+        await context.select(route: .notifications)
         context.push(NotificationLoadingViewController(notificationID: notificationID, mastodonController: mastodonController))
     }
     

Tusker/Shortcuts/UserActivityType.swift

@@ -23,7 +23,7 @@ enum UserActivityType: String {
 
 extension UserActivityType {
     @MainActor
-    var handle: (UserActivityManager) -> @MainActor (NSUserActivity) -> Void {
+    var handle: (UserActivityManager) -> @MainActor (NSUserActivity) async -> Void {
         switch self {
         case .mainScene:
             fatalError("cannot handle main scene activity")