Use fully-qualified `PersistedEventPosition` when returning `RoomsForUser` (#17265)

Use fully-qualified `PersistedEventPosition` (`instance_name` and `stream_ordering`) when returning `RoomsForUser` to facilitate proper comparisons and `RoomStreamToken` generation.

Spawning from https://github.com/element-hq/synapse/pull/17187 where we want to utilize this change

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/initial_sync.py b/synapse/handlers/initial_sync.py

index d99fc4bec0..84d6fecf31 100644
--- a/synapse/handlers/initial_sync.py
+++ b/synapse/handlers/initial_sync.py
@@ -199,7 +199,7 @@ class InitialSyncHandler:
                     )
                 elif event.membership == Membership.LEAVE:
                     room_end_token = RoomStreamToken(
-                        stream=event.stream_ordering,
+                        stream=event.event_pos.stream,
                     )
                     deferred_room_state = run_in_background(
                         self._state_storage_controller.get_state_for_events,