Button 'Go to next room with unread messages'

[Biep]

This is useful in itself, but it also solves the problem of the spurious tray icon counter - eventually it will take you to the offending (now disused) room.

[aaronraimist]

Basically #301

[Biep]

Seems so, yes. I'll move my comment there, and then this one can be closed.