This layout combinator is similar in spirit (and in code) to
the old combo combinator, but only allows two sublayouts. As
a result, we don't need to wrap these in existentials, and reading
works seamlessly. Also, we add the feature (which could also be
added to combo) of being able to change which sublayout a given
window is in through integration with WindowNavigation.
I envision combo being deprecated soon. combineTwo isn't quite
so flexible, but it's much easier and is better-coded also.
I told to David I would have taken care of that: instead of exporting
the config constructor we export 2 functions: navigateColor and
noNavigateBorders. Updated documentation accordingly.
It seems that GHC 6.6 just enables -fglasgow-exts when it sees any LANGUAGE
pragma, so not all of them were added; this patch adds the rest of them, which
is necessary for xmonad to compile in GHC >=6.7.
This allows you to reorder your windows geometrically, by
swapping the currently focussed window with ones that are
up/down/right/left of it. The idea is that we should be
able to manipulate windows based on the visual layout of
the screen rather than some (possibly obscure) logical ordering.
