allow setting an internal id prefix to a focused timeline builder

Author: bnjbvr

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

@@ -176,14 +176,21 @@ impl Room {
         &self,
         event_id: String,
         num_context_events: u16,
+        internal_id_prefix: Option<String>,
     ) -> Result<Arc<Timeline>, FocusEventError> {
         let parsed_event_id = EventId::parse(&event_id).map_err(|err| {
             FocusEventError::InvalidEventId { event_id: event_id.clone(), err: err.to_string() }
         })?;
 
         let room = &self.inner;
 
-        let timeline = match matrix_sdk_ui::timeline::Timeline::builder(room)
+        let mut builder = matrix_sdk_ui::timeline::Timeline::builder(room);
+
+        if let Some(internal_id_prefix) = internal_id_prefix {
+            builder = builder.with_internal_id_prefix(internal_id_prefix);
+        }
+
+        let timeline = match builder
             .with_focus(TimelineFocus::Event {
                 target: parsed_event_id,
                 num_context_events: num_context_events.into(),