[Xmonad] darcs patch: Add Font layer supporting an Xft backend. Make Tabbed....

[Clemens Fruhwirth]

This darcs patch adds Xft support to XMonad. It consists of two parts:

* a thin layer capturing FontStruct and XftFont in an Either type and
  providing a small set of functions to operate on this new XMonadFont
  type (implemented in XUtil.hs)
* Change Tabbed.hs to be a user of this interface.

You need to add the "X11-xft" package to your build-depends in
xmonad.cabal (available as darcs repository from
http://clemens.endorphin.org/X11-xft/).

This is the initial support (but ready for every day use
imho). textXMFExtents is not yet perfect, as it doesn't return a
useful descent metric (resulting in slightly unaligned tab
titles). I'm surely going to be annoyed by this in the next week and
will post a follow up patch. But the more importent issues to be discussed are:

* Is the Xft feature desired?
* If yes, should we kick FontStruct in favour of XftFont? Xft is able
  to handle Core Fonts as well. And I hope the i18n will go away with
  this move.

Thu Oct 11 13:09:09 CEST 2007  Clemens Fruhwirth <clemens at endorphin.org>
  * Add Font layer supporting an Xft backend. Make Tabbed.hs a user of this layer.
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