When information is entered for a custom room to be joined an the room is joined or saved & joined, the information in the dialog is not cleared.
Even when the dialog is closed and reopened via the menu, the original input is still there.

Also do I wonder why the dialog is still there after joining.  Although the second tab shows some status of all known rooms, I am not very often doing a batch of room-joinings so the dialog can be hidden after joining.  Or maybe should it switch to the "Saved Rooms" tab displaying the information (also a bit strange... Saved Rooms thus displaying joined-rooms-status).