This is a convenience module in order to have less import noise. It
re-exports the following:
a) Commonly used modules in full (Data.Foldable, Data.Applicative, and
so on); though only those that play nicely with each other, so that
XMonad.Prelude can be imported unqualified without any problems.
This prevents things like `Prelude.(.)` and `Control.Category.(.)`
fighting with each other.
b) Helper functions that don't necessarily fit in any other module;
e.g., the often used abbreviation `fi = fromIntegral`.
Before this fix, when using layoutHintsToCenter together with
MultiColumns, in certain situations XMonad would render the border of
the focused window below a border of unfocused windows. This looks odd
and is here fixed by changing MultiColumns to always place the focused
window in front (even though they should not really overlap) and making
LayoutHints preserve the order returned from the underlying layout,
except for the focused window that is placed on top.
This is a good idea since layoutHintsToCenter requires the focused
window to be on top for good rendering, even if that is not really
required when the underlying layout is used on its own. This way
layoutHintsToCenter requires less of the layout that is modified and
MultiColumns is more compatible with future layout modifiers that are
not so considerate.
Fix bug where a column list of insufficient length could be used to find the column of the window. Also fix formating to conform better with standards.
New layout inspired the realization that I was switching between Mirror Tall and Mirror ThreeCol depending on how many windows there were on the workspace. This layout will make those changes automatically.
