Set target content identifiers on scenes/activities

NotificationExtension/NotificationService.swift

@@ -63,6 +63,7 @@ class NotificationService: UNNotificationServiceExtension {
         mutableContent.body = notification.body
         mutableContent.userInfo["notificationID"] = notification.notificationID
         mutableContent.userInfo["accountID"] = accountID
+        mutableContent.targetContentIdentifier = accountID
 
         let task = Task {
             await updateNotificationContent(mutableContent, account: account, push: notification)

Tusker/AppDelegate.swift

@@ -295,7 +295,12 @@ extension AppDelegate: UNUserNotificationCenterDelegate {
             rootViewController.getNavigationController().pushViewController(vc, animated: false)
         } else {
             let activity = UserActivityManager.showNotificationActivity(id: notificationID, accountID: accountID)
-            UIApplication.shared.requestSceneSessionActivation(nil, userActivity: activity, options: nil)
+            if #available(iOS 17.0, *) {
+                let request = UISceneSessionActivationRequest(userActivity: activity)
+                UIApplication.shared.activateSceneSession(for: request)
+            } else {
+                UIApplication.shared.requestSceneSessionActivation(nil, userActivity: activity, options: nil)
+            }
         }
         completionHandler()
     }

Tusker/Scenes/AuxiliarySceneDelegate.swift

@@ -32,8 +32,9 @@ class AuxiliarySceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDel
         }
         launchActivity = activity
         
-        let account: UserAccountInfo
+        scene.activationConditions.canActivateForTargetContentIdentifierPredicate = NSPredicate(value: false)
 
+        let account: UserAccountInfo
         if let activityAccount = UserActivityManager.getAccount(from: activity) {
             account = activityAccount
         } else if let mostRecent = UserAccountsManager.shared.getMostRecentAccount() {

Tusker/Scenes/ComposeSceneDelegate.swift

@@ -29,6 +29,8 @@ class ComposeSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDeleg
             return
         }
         
+        scene.activationConditions.canActivateForTargetContentIdentifierPredicate = NSPredicate(value: false)
+
         let account: UserAccountInfo
         let controller: MastodonController
         let draft: Draft?

Tusker/Scenes/MainSceneDelegate.swift

@@ -225,6 +225,8 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
             window!.windowScene!.title = account.instanceURL.host!
         }
         
+        window!.windowScene!.activationConditions.prefersToActivateForTargetContentIdentifierPredicate = NSPredicate(format: "self == %@", account.id)
+        
         if let container = window?.rootViewController as? AccountSwitchingContainerViewController {
             let direction: AccountSwitchingContainerViewController.AnimationDirection
             if animated,

Tusker/Shortcuts/NSUserActivity+Extensions.swift

@@ -39,6 +39,7 @@ extension NSUserActivity {
         self.userInfo = [
             "accountID": accountID
         ]
+        self.targetContentIdentifier = accountID
     }
     
     @MainActor