[xmonad] DynamicWorkspaces: New WS not accessible with mod+number

[Ralph Hofmann]

I prefer using only few workspaces by default and adding one if needed,
whether by adding a workspace with addWorkspace and rename it or, more
easily, by using selectWorkspace and entering a number that doesn't
exist. In both cases, i can't access the new workspace by "mod + number
of workspace".

Is there a workaround?

My xmonad has version 0.9-1.

Ralph