I have Kmail set up without a message preview to save space on my screen.  I am trying to find a way to set up a keyboard shortcut to go to the next unread message when I have a message open in its own window.I tried using + and I tried the space bar.  Neither worked and I think setting up a global shortcut may be the way to go.  However, I cannot put anything in the field global in the list of keyboard shortcuts.Any other ideas how to go to the next unread message?
Next unread message shortcut in Kmail message window
kde;kmail