fix: no longer make the scroll position jump oddly

only allow front insert in profile when body is fully obstructed

Closes: https://github.com/damus-io/notedeck/issues/1072

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck_columns/src/timeline/mod.rs

@@ -133,6 +133,7 @@ impl TimelineTab {
         ndb: &Ndb,
         txn: &Transaction,
         reversed: bool,
+        use_front_insert: bool,
     ) -> Option<UnknownPks<'a>> {
         if payloads.is_empty() {
             return None;
@@ -158,7 +159,11 @@ impl TimelineTab {
                 debug!("spliced when inserting {num_refs} new notes, resetting virtual list",);
                 list.reset();
             }
-            MergeKind::FrontInsert => {
+            MergeKind::FrontInsert => 's: {
+                if !use_front_insert {
+                    break 's;
+                }
+
                 // only run this logic if we're reverse-chronological
                 // reversed in this case means chronological, since the
                 // default is reverse-chronological. yeah it's confusing.
@@ -210,6 +215,7 @@ pub struct Timeline {
     pub selected_view: usize,
 
     pub subscription: TimelineSub,
+    pub enable_front_insert: bool,
 }
 
 impl Timeline {
@@ -271,12 +277,16 @@ impl Timeline {
         let subscription = TimelineSub::default();
         let selected_view = 0;
 
+        // by default, disabled for profiles since they contain widgets above the list items
+        let enable_front_insert = !matches!(kind, TimelineKind::Profile(_));
+
         Timeline {
             kind,
             filter,
             views,
             subscription,
             selected_view,
+            enable_front_insert,
         }
     }
 
@@ -402,7 +412,9 @@ impl Timeline {
             match view.filter {
                 ViewFilter::NotesAndReplies => {
                     let res: Vec<&NotePayload<'_>> = payloads.iter().collect();
-                    if let Some(res) = view.insert(res, ndb, txn, reversed) {
+                    if let Some(res) =
+                        view.insert(res, ndb, txn, reversed, self.enable_front_insert)
+                    {
                         res.process(unknown_ids, ndb, txn);
                     }
                 }
@@ -418,7 +430,13 @@ impl Timeline {
                         }
                     }
 
-                    if let Some(res) = view.insert(filtered_payloads, ndb, txn, reversed) {
+                    if let Some(res) = view.insert(
+                        filtered_payloads,
+                        ndb,
+                        txn,
+                        reversed,
+                        self.enable_front_insert,
+                    ) {
                         res.process(unknown_ids, ndb, txn);
                     }
                 }

crates/notedeck_columns/src/ui/profile/mod.rs

@@ -39,6 +39,11 @@ pub enum ProfileViewAction {
     Follow(Pubkey),
 }
 
+struct ProfileScrollResponse {
+    body_end_pos: f32,
+    action: Option<ProfileViewAction>,
+}
+
 impl<'a, 'd> ProfileView<'a, 'd> {
     #[allow(clippy::too_many_arguments)]
     pub fn new(
@@ -65,9 +70,13 @@ impl<'a, 'd> ProfileView<'a, 'd> {
 
     pub fn ui(&mut self, ui: &mut egui::Ui) -> Option<ProfileViewAction> {
         let scroll_id = ProfileView::scroll_id(self.col_id, self.pubkey);
-        let scroll_area = ScrollArea::vertical().id_salt(scroll_id);
+        let scroll_area = ScrollArea::vertical().id_salt(scroll_id).animated(false);
 
-        let output = scroll_area.show(ui, |ui| 's: {
+        let profile_timeline = self
+            .timeline_cache
+            .get_mut(&TimelineKind::Profile(*self.pubkey))?;
+
+        let output = scroll_area.show(ui, |ui| {
             let mut action = None;
             let txn = Transaction::new(self.note_context.ndb).expect("txn");
             let profile = self
@@ -82,13 +91,6 @@ impl<'a, 'd> ProfileView<'a, 'd> {
                 action = Some(profile_view_action);
             }
 
-            let Some(profile_timeline) = self
-                .timeline_cache
-                .get_mut(&TimelineKind::Profile(*self.pubkey))
-            else {
-                break 's action;
-            };
-
             let tabs_resp = tabs_ui(
                 ui,
                 self.note_context.i18n,
@@ -121,10 +123,16 @@ impl<'a, 'd> ProfileView<'a, 'd> {
                 action = Some(ProfileViewAction::Note(note_action));
             }
 
-            action
+            ProfileScrollResponse {
+                body_end_pos: tabs_resp.response.rect.bottom(),
+                action,
+            }
         });
 
-        output.inner
+        // only allow front insert when the profile body is fully obstructed
+        profile_timeline.enable_front_insert = output.inner.body_end_pos < ui.clip_rect().top();
+
+        output.inner.action
     }
 }