Scroll to latest pending post on button tap

Packages/Timeline/Sources/Timeline/PendingStatusesObserver.swift

@@ -8,6 +8,7 @@ class PendingStatusesObserver: ObservableObject {
   @Published var pendingStatusesCount: Int = 0
 
   var disableUpdate: Bool = false
+  var scrollToIndex: ((Int) -> ())?
 
   var pendingStatuses: [String] = [] {
     didSet {
@@ -27,11 +28,14 @@ class PendingStatusesObserver: ObservableObject {
 
 struct PendingStatusesObserverView: View {
   @ObservedObject var observer: PendingStatusesObserver
+  
   var body: some View {
     if observer.pendingStatusesCount > 0 {
       HStack(spacing: 6) {
         Spacer()
-        Button {} label: {
+        Button {
+          observer.scrollToIndex?(observer.pendingStatusesCount)
+        } label: {
           Text("\(observer.pendingStatusesCount)")
         }
         .buttonStyle(.bordered)

Packages/Timeline/Sources/Timeline/TimelineView.swift

@@ -63,10 +63,11 @@ public struct TimelineView: View {
       }
       .onChange(of: viewModel.scrollToIndex) { index in
         if let index {
-          viewModel.scrollToIndex = nil
           collectionView?.scrollToItem(at: .init(row: index, section: 0),
                                        at: .top,
-                                       animated: false)
+                                       animated: viewModel.scrollToIndexAnimated)
+          viewModel.scrollToIndexAnimated = false
+          viewModel.scrollToIndex = nil
         }
       }
       .onChange(of: scrollToTopSignal, perform: { _ in

Packages/Timeline/Sources/Timeline/TimelineViewModel.swift

@@ -35,6 +35,7 @@ class TimelineViewModel: ObservableObject {
 
   private let cache: TimelineCache = .shared
 
+  var scrollToIndexAnimated: Bool = false
   @Published var scrollToIndex: Int?
 
   @Published var statusesState: StatusesState = .loading
@@ -67,6 +68,13 @@ class TimelineViewModel: ObservableObject {
     client?.server ?? "Error"
   }
   
+  init() {
+    pendingStatusesObserver.scrollToIndex = { [weak self] index in
+      self?.scrollToIndexAnimated = true
+      self?.scrollToIndex = index
+    }
+  }
+
   private func fetchTag(id: String) async {
     guard let client else { return }
     do {
@@ -225,6 +233,7 @@ extension TimelineViewModel: StatusesFetcher {
       if let topStatusId, visibileStatusesIds.contains(topStatusId), scrollToTopVisible {
         pendingStatusesObserver.disableUpdate = true
         statusesState = .display(statuses: statuses, nextPageState: statuses.count < 20 ? .none : .hasNextPage)
+        scrollToIndexAnimated = false
         scrollToIndex = newStatuses.count + 1
         DispatchQueue.main.async {
           self.pendingStatusesObserver.disableUpdate = false