This exports the `withRecentsIn` function, as it's quite useful when
using X.H.RefocusLast in other modules as a library.
It is already possible (RecentsMap is fully exported) to completely
define this function outside of the module, so we are not exposing any
more internals than we were before.
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`.
