Function await_join_aggregates 

async fn await_join_aggregates(
    services: &Services,
    sender_user: &UserId,
    room_id: &RoomId,
    state_events: &[PduEvent],
    timeline_pdus: Vec<(PduCount, PduEvent)>,
    joined_sender_member: Option<PduEvent>,
    encrypted: bool,
    initial: bool,
    since: u64,
    next_batch: u64,
    last_privateread_update: u64,
    send_notification_counts: bool,
    filter: &FilterDefinition,
) -> JoinAggregates