Selecting "View -> Goto -> next unread" then trying to set "n" as key shortcut opens dialog from failed search for next coloured message
If I remember correcly, you should stay focused with mouse pointer over the "next unread" when pressing first "n". But setting "n" for this action is possible this way.
> If I remember correcly, you should stay focused with mouse pointer > over the "next unread" when pressing first "n". But setting "n" for > this action is possible this way. You may set it to other keys. but not "n" as soon as you try you'll not set a shortcut, but jump to "search for next coloured message" (and since there are none you'll see a dialog asking to search from beginning). You may even hover "next coloured message" and then press "n" to set it as shortcut. It will start a search for next coloured message.