4cf0d7a18b
This patch avoids to emit a `RoomInfoNotableUpdateReasons::RECENCY_TIMESTAMP` for rooms that are new. Otherwise the entries in `matrix_sdk_ui::room_list_service::RoomList` receive a `VectorDiff` because a new room is inserted, and then a `VectorDiff` because the recency timestamp is updated. The second `VectorDiff` is useless in this case.