Application window title should display number of rooms with unread notifications
Currently the application window's title doesn't change to indicate that there is some "unread" activity.
I'd expect that it shows the number of distinct things you need to take care of, rather than just the "total number of unread messages". That is to say, this window title number should not be the sum of the number of unread messages across rooms, but rather the number of rooms that contain at least one unread message.