ui: Improve logging for timeline resets

crates/matrix-sdk-ui/src/timeline/builder.rs

@@ -180,11 +180,16 @@ impl TimelineBuilder {
         let mut ignore_user_list_stream = client.subscribe_to_ignore_user_list_changes();
         let ignore_user_list_update_join_handle = spawn({
             let inner = inner.clone();
+
+            let span = info_span!(parent: Span::none(), "ignore_user_list_update_handler", room_id = ?room.room_id());
+            span.follows_from(Span::current());
+
             async move {
                 while ignore_user_list_stream.next().await.is_some() {
                     inner.clear().await;
                 }
             }
+            .instrument(span)
         });
 
         // Not using room.add_event_handler here because RoomKey events are

crates/matrix-sdk-ui/src/timeline/inner/state.rs

@@ -649,8 +649,6 @@ impl TimelineInnerStateTransaction<'_> {
     }
 
     fn clear(&mut self) {
-        trace!("Clearing timeline");
-
         // By first checking if there are any local echoes first, we do a bit
         // more work in case some are found, but it should be worth it because
         // there will often not be any, and only emitting a single
@@ -686,6 +684,8 @@ impl TimelineInnerStateTransaction<'_> {
         self.fully_read_event = None;
         self.event_should_update_fully_read_marker = false;
         self.back_pagination_tokens.clear();
+
+        debug!(remaining_items = self.items.len(), "Timeline cleared");
     }
 
     #[instrument(skip_all)]