pub fn get_or_fetch_event_sender(
event_tl_item: &EventTimelineItem,
room_id: Option<&OwnedRoomId>,
) -> StringExpand description
Returns the sender’s display name if available.
If not available, and if the room_id is provided, this function will
submit an async request to fetch the event details.
In this case, this will return the event sender’s user ID as a string.