Remove deleted statuses on notifications screen

Tusker/Screens/Notifications/NotificationsCollectionViewController.swift

@@ -120,6 +120,8 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
         filterer.filtersChanged = { [unowned self] actionsChanged in
             self.reapplyFilters(actionsChanged: actionsChanged)
         }
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(handleStatusDeleted), name: .statusDeleted, object: nil)
     }
     
     private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
@@ -253,6 +255,24 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
         dataSource.apply(snapshot)
     }
     
+    @objc private func handleStatusDeleted(_ notification: Foundation.Notification) {
+        guard let userInfo = notification.userInfo,
+              let accountID = mastodonController.accountInfo?.id,
+              userInfo["accountID"] as? String == accountID,
+              let statusIDs = userInfo["statusIDs"] as? [String] else {
+            return
+        }
+        var snapshot = dataSource.snapshot()
+        let items = snapshot.itemIdentifiers(inSection: .notifications)
+        let toDelete = statusIDs.flatMap { id in
+            items.lazy.filter { $0.group?.notifications.first?.status?.id == id }
+        }
+        if !toDelete.isEmpty {
+            snapshot.deleteItems(toDelete)
+            dataSource.apply(snapshot, animatingDifferences: true)
+        }
+    }
+    
     private func dismissNotificationsInGroup(at indexPath: IndexPath) async {
         guard case .group(let group, let collapseState, let filterState) = dataSource.itemIdentifier(for: indexPath) else {
             return