[Freeciv-Dev] why must this capability stay?

[Mike Kaufman <kaufman@xxxxxxxxxxxxxxxxxxxxxx>]

/**************************************************************************
Fills in conn.id automatically, no need to set in packet_join_game_reply.
**************************************************************************/
int send_packet_join_game_reply(struct connection *pc,
                                const struct packet_join_game_reply *reply)
{
  SEND_PACKET_START(PACKET_JOIN_GAME_REPLY);

  dio_put_bool32(&dout, reply->you_can_join);
  dio_put_string(&dout, reply->message);
  dio_put_string(&dout, reply->capability);

  /* This must stay even at new releases! */
  if (has_capability("conn_info", pc->capability)) {
    dio_put_uint32(&dout, pc->id);
  }

  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  SEND_PACKET_END;
}

why has this got to stay?

-mike