This window (Chat→Room directory) is to be used for either a list of
publicly available rooms (in most protocols), or for a list of
joined-but-hidden rooms (as it'll used with libpurple, to list its
ChatBuddies).
Each room is sent individually from protocols using IM_ROOM_DIRECTORY
messages sent in response to a IM_GET_ROOM_DIRECTORY message.
Jaidyn Ann