Update notification view after approving or rejecting a follow request

Fixes #1342 [BUG] Follow requests no longer working

Mastodon/Protocol/Provider/DataSourceProvider+NotificationTableViewCellDelegate.swift

@@ -120,6 +120,9 @@ extension NotificationTableViewCellDelegate where Self: DataSourceProvider & Aut
                 notificationView: notificationView,
                 query: .accept
             )
+            if let self = self as? NotificationTimelineViewController {
+                self.didActOnFollowRequest(notification, approved: true)
+            }
         }
     }
     
@@ -136,7 +139,7 @@ extension NotificationTableViewCellDelegate where Self: DataSourceProvider & Aut
                 return
             }
             guard case let .notification(notification) = item else {
-                assertionFailure("only works for status data provider")
+                assertionFailure("only works for notification")
                 return
             }
 
@@ -146,6 +149,9 @@ extension NotificationTableViewCellDelegate where Self: DataSourceProvider & Aut
                 notificationView: notificationView,
                 query: .reject
             )
+            if let self = self as? NotificationTimelineViewController {
+                self.didActOnFollowRequest(notification, approved: false)
+            }
         }
     }
 }

Mastodon/Scene/Notification/NotificationTimeline/NotificationTimelineViewController.swift

@@ -47,6 +47,10 @@ class NotificationTimelineViewController: UIViewController, MediaPreviewableView
     }
     
     required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
+    
+    func didActOnFollowRequest(_ notification: MastodonNotification, approved: Bool) {
+        viewModel.didActOnFollowRequest(notification, approved: approved)
+    }
 }
 
 extension NotificationTimelineViewController {

Mastodon/Scene/Notification/NotificationTimeline/NotificationTimelineViewModel.swift

@@ -70,6 +70,21 @@ final class NotificationTimelineViewModel {
             await self.loadLatest()
         }
     }
+    
+    func didActOnFollowRequest(_ notification: MastodonNotification, approved: Bool) {
+        defer {
+            Task {
+                await loadLatest()
+            }
+        }
+        guard var currentSnapshot = diffableDataSource?.snapshot() else { return }
+        let identifier = NotificationListItem.notification(.notification(id: notification.id))
+        if currentSnapshot.itemIdentifiers.contains(identifier) {
+            if !approved {
+                currentSnapshot.deleteItems([identifier])
+            }
+        }
+    }
 }
 
 extension NotificationTimelineViewModel {