[xmonad] darcs patch: hide the implementation type in "EwmhDes... (and 1 more)

[Devin Mullins]

I don't have time to apply patches right now, but:

On Mon, Sep 08, 2008 at 12:01:35PM +0200, Joachim Breitner wrote:
>   It could also be wrapped in a newtype, instead of a "type", but that would
>   require manual instances of the various classes, as ghc can automatically
>   derive the LayoutClass instance.
Isn't this what GeneralizedNewtypeDeriving does?