chore(sdk): Remove subscribe_to_pinned_events.

This patch removes `subscribe_to_pinned_events`, it is now useless.

Author: Hywan

crates/matrix-sdk/src/event_cache/caches/room/mod.rs

@@ -150,23 +150,6 @@ impl RoomEventCache {
         Ok((events, subscriber))
     }
 
-    /// Subscribe to the pinned event cache for this room.
-    ///
-    /// This is a persisted view over the pinned events of a room.
-    ///
-    /// The pinned events will be initially reloaded from storage, and/or loaded
-    /// from a network request to fetch the latest pinned events and their
-    /// relations, to update it as needed. The list of pinned events will
-    /// also be kept up-to-date as new events are pinned, and new
-    /// related events show up from other sources.
-    pub async fn subscribe_to_pinned_events(
-        &self,
-    ) -> Result<(Vec<Event>, Receiver<TimelineVectorDiffs>)> {
-        let state = self.inner.state.read().await?;
-
-        state.subscribe_to_pinned_events(&self.inner.weak_room).await
-    }
-
     /// Create or get an event-focused timeline cache for this room.
     ///
     /// This creates a timeline centered around a specific event (e.g., for

crates/matrix-sdk/src/event_cache/caches/room/state.rs

@@ -361,34 +361,6 @@ impl<'a> RoomEventCacheStateLockReadGuard<'a> {
         EventCacheStoreLockGuard::is_dirty(&self.store)
     }
 
-    /// Subscribe to the lazily initialized pinned event cache for this
-    /// room.
-    ///
-    /// This is a persisted view over the pinned events of a room. The
-    /// pinned events will be initially loaded from a network
-    /// request to fetch the latest pinned events will be performed,
-    /// to update it as needed. The list of pinned events will also
-    /// be kept up-to-date as new events are pinned, and new related
-    /// events show up from sync or backpagination.
-    ///
-    /// This requires the room's event cache to be initialized.
-    pub async fn subscribe_to_pinned_events(
-        &self,
-        weak_room: &WeakRoom,
-    ) -> Result<(Vec<Event>, Receiver<TimelineVectorDiffs>), EventCacheError> {
-        let pinned_events_cache = self.state.pinned_events_cache.get_or_try_init(|| {
-            PinnedEventsCache::new(
-                weak_room,
-                self.own_user_id.clone(),
-                self.room_version_rules.clone(),
-                self.state.linked_chunk_update_sender.clone(),
-                self.state.store.clone(),
-            )
-        })?;
-
-        pinned_events_cache.subscribe().await
-    }
-
     /// Get an event-focused cache for this event and thread mode, if it
     /// exists.
     ///