chore: Remove the old Latest Event API

bindings/matrix-sdk-ffi/CHANGELOG.md

@@ -6,6 +6,13 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased] - ReleaseDate
 
+### Features
+
+- [**breaking**]: The new Latest Event API replaces the old API.
+  `Room::new_latest_event` overwrites the `Room::latest_event` method. See the
+  documentation of `matrix_sdk::latest_event` to learn about the new API.
+  [#5624](https://github.com/matrix-org/matrix-rust-sdk/pull/5624/)
+
 ## [0.16.0] - 2025-12-04
 
 ### Breaking changes

bindings/matrix-sdk-ffi/src/room/mod.rs

@@ -53,8 +53,7 @@ use crate::{
     runtime::get_runtime_handle,
     timeline::{
         configuration::{TimelineConfiguration, TimelineFilter},
-        AbstractProgress, EventTimelineItem, LatestEventValue, ReceiptType, SendHandle, Timeline,
-        UploadSource,
+        AbstractProgress, LatestEventValue, ReceiptType, SendHandle, Timeline, UploadSource,
     },
     utils::{u64_to_uint, AsyncRuntimeDropped},
     TaskHandle,
@@ -303,12 +302,8 @@ impl Room {
             .unwrap_or(false)
     }
 
-    async fn latest_event(&self) -> Option<EventTimelineItem> {
-        self.inner.latest_event_item().await.map(Into::into)
-    }
-
-    async fn new_latest_event(&self) -> LatestEventValue {
-        self.inner.new_latest_event().await.into()
+    async fn latest_event(&self) -> LatestEventValue {
+        self.inner.latest_event().await.into()
     }
 
     pub async fn latest_encryption_state(&self) -> Result<EncryptionState, ClientError> {

crates/matrix-sdk-base/src/client.rs

@@ -611,35 +611,14 @@ impl BaseClient {
         let mut context = Context::new(StateChanges::new(response.next_batch.clone()));
 
         #[cfg(feature = "e2e-encryption")]
-        let to_device = {
-            let processors::e2ee::to_device::Output {
-                processed_to_device_events: to_device,
-                room_key_updates,
-            } = processors::e2ee::to_device::from_sync_v2(
+        let processors::e2ee::to_device::Output { processed_to_device_events: to_device } =
+            processors::e2ee::to_device::from_sync_v2(
                 &response,
                 olm_machine.as_ref(),
                 &self.decryption_settings,
             )
             .await?;
 
-            processors::latest_event::decrypt_from_rooms(
-                &mut context,
-                room_key_updates
-                    .into_iter()
-                    .flatten()
-                    .filter_map(|room_key_info| self.get_room(&room_key_info.room_id))
-                    .collect(),
-                processors::e2ee::E2EE::new(
-                    olm_machine.as_ref(),
-                    &self.decryption_settings,
-                    self.handle_verification_events,
-                ),
-            )
-            .await?;
-
-            to_device
-        };
-
         #[cfg(not(feature = "e2e-encryption"))]
         let to_device = response
             .to_device