room list service: always include the m.room.create state event in a room subscription

crates/matrix-sdk-ui/src/room_list_service/room.rs

@@ -18,7 +18,7 @@ use std::{ops::Deref, sync::Arc};
 
 use async_once_cell::OnceCell as AsyncOnceCell;
 use matrix_sdk::{event_cache, SlidingSync, SlidingSyncRoom};
-use ruma::{api::client::sync::sync_events::v4::RoomSubscription, RoomId};
+use ruma::{api::client::sync::sync_events::v4::RoomSubscription, events::StateEventType, RoomId};
 
 use super::Error;
 use crate::{
@@ -98,7 +98,21 @@ impl Room {
     /// It means that all events from this room will be received every time, no
     /// matter how the `RoomList` is configured.
     pub fn subscribe(&self, settings: Option<RoomSubscription>) {
-        self.inner.sliding_sync.subscribe_to_room(self.inner.room.room_id().to_owned(), settings)
+        let mut settings = settings.unwrap_or_default();
+
+        // Make sure to always include the room creation event in the required state
+        // events, to know what the room version is.
+        if !settings
+            .required_state
+            .iter()
+            .any(|(event_type, _state_key)| *event_type == StateEventType::RoomCreate)
+        {
+            settings.required_state.push((StateEventType::RoomCreate, "".to_owned()));
+        }
+
+        self.inner
+            .sliding_sync
+            .subscribe_to_room(self.inner.room.room_id().to_owned(), Some(settings))
     }
 
     /// Unsubscribe to this room.

crates/matrix-sdk-ui/tests/integration/room_list_service.rs

@@ -2411,6 +2411,7 @@ async fn test_room_subscription() -> Result<(), Error> {
                         ["m.room.topic", ""],
                         ["m.room.avatar", ""],
                         ["m.room.canonical_alias", ""],
+                        ["m.room.create", ""], // Added even when it's not specified
                     ],
                     "timeline_limit": 30,
                 },