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

Hi, I’ve merged this patch, and re-submit it now. Isn’t it nicer to have the exposed type less implementation-specific? Greetings, Joachim Tue Jun 10 21:29:18 CEST 2008 Joachim Breitner * hide the implementation type in "EwmhDesktopsLayout" Instead of exporting the EwmhDesktopsHook type, which is used internally, export a type alias for (HandleEvent EwmhDesktopsHook), so users don't have to update their xmonad.hs if the implementation changes. 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. Mon Sep 8 11:59:17 CEST 2008 Joachim Breitner * Merge "hide the implementation type in "EwmhDesktopsLayout""