chore(multiverse): simplify marking a room as read

Author: stefanceriu

labs/multiverse/src/widgets/room_view/mod.rs

@@ -12,7 +12,6 @@ use matrix_sdk::{
     },
     RoomState,
 };
-use matrix_sdk_ui::timeline::TimelineBuilder;
 use ratatui::{prelude::*, widgets::*};
 use tokio::{spawn, task::JoinHandle};
 
@@ -320,21 +319,14 @@ impl RoomView {
 
     /// Mark the currently selected room as read.
     pub async fn mark_as_read(&mut self) {
-        let selected = self.selected_room.as_deref();
-
-        let Some(room) = selected.and_then(|room_id| self.ui_rooms.lock().get(room_id).cloned())
-        else {
-            self.status_handle.set_message("missing room or nothing to show".to_owned());
-            return;
-        };
-
-        // Mark as read!
-        let Ok(timeline) = TimelineBuilder::new(&room).build().await else {
-            self.status_handle.set_message("failed creating timeline".to_owned());
+        let Some(sdk_timeline) = self.selected_room.as_deref().and_then(|room_id| {
+            self.timelines.lock().get(room_id).map(|timeline| timeline.timeline.clone())
+        }) else {
+            self.status_handle.set_message("missing timeline for room".to_owned());
             return;
         };
 
-        match timeline.mark_as_read(ReceiptType::Read).await {
+        match sdk_timeline.mark_as_read(ReceiptType::Read).await {
             Ok(did) => {
                 self.status_handle.set_message(format!(
                     "did {}send a read receipt!",