Fix occasional stale timeline issue

Changelog-Changed: Added UX hint to make it easier to load new notes
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/Features/FollowPack/Views/FollowPackTimeline.swift

@@ -66,7 +66,7 @@ struct FollowPackTimelineView<Content: View>: View {
             .coordinateSpace(name: "scroll")
             .onReceive(handle_notify(.scroll_to_top)) { () in
                 events.flush()
-                self.events.should_queue = false
+                self.events.set_should_queue(false)
                 scroll_to_event(scroller: scroller, id: "startblock", delay: 0.0, animate: true, anchor: .top)
             }
         }

damus/Features/Timeline/Views/InnerTimelineView.swift

@@ -29,6 +29,26 @@ struct InnerTimelineView: View {
     
     var body: some View {
         LazyVStack(spacing: 0) {
+            let incomingEvents = events.incoming.filter({ filter($0) })
+            if incomingEvents.count > 0 {
+                Button(
+                    action: {
+                        notify(.scroll_to_top)
+                    },
+                    label: {
+                        HStack(spacing: 6) {
+                            CondensedProfilePicturesView(state: state, pubkeys: incomingEvents.map({ $0.pubkey }), maxPictures: 3)
+                            Text("Load new content", comment: "Button to load new notes in the timeline")
+                                .bold()
+                        }
+                        .padding(.horizontal, 20)
+                        .padding(.vertical, 10)
+                    }
+                )
+                .buttonStyle(NeutralButtonStyle(cornerRadius: 50))
+                .padding(.vertical, 10)
+            }
+            
             let events = self.events.events
             if events.isEmpty {
                 EmptyTimelineView()

damus/Features/Timeline/Views/TimelineView.swift

@@ -97,7 +97,7 @@ struct TimelineView<Content: View>: View {
             .coordinateSpace(name: "scroll")
             .onReceive(handle_notify(.scroll_to_top)) { () in
                 events.flush()
-                self.events.should_queue = false
+                self.events.set_should_queue(false)
                 scroll_to_event(scroller: scroller, id: "startblock", delay: 0.0, animate: true, anchor: .top)
             }
         }
@@ -122,11 +122,8 @@ protocol ScrollQueue {
     
 func handle_scroll_queue(_ proxy: GeometryProxy, queue: ScrollQueue) {
     let offset = -proxy.frame(in: .named("scroll")).origin.y
-    guard offset >= 0 else {
-        return
-    }
-    let val = offset > 0
-    if queue.should_queue != val {
-        queue.set_should_queue(val)
+    let new_should_queue = offset > 0
+    if queue.should_queue != new_should_queue {
+        queue.set_should_queue(new_should_queue)
     }
 }

damus/Shared/Utilities/EventHolder.swift

@@ -11,8 +11,8 @@ import Foundation
 class EventHolder: ObservableObject, ScrollQueue {
     private var has_event = Set<NoteId>()
     @Published var events: [NostrEvent]
-    var incoming: [NostrEvent]
-    var should_queue = false
+    @Published var incoming: [NostrEvent]
+    private(set) var should_queue = false
     var on_queue: ((NostrEvent) -> Void)?
     
     func set_should_queue(_ val: Bool) {