X.L.StateFull's `FocusTracking` and the eponymous `TrackFloating` were
redundant, hence the former was slated for deprecation. However,
the latter and its host module are somewhat poorly named; the layout
modifier has little relation to floats. As such, it's renamed and
rehosted, becoming the eponymous `FocusTracking`.
The redundant offerings in the original modules are redefined in terms
of the new module where possible, and deprecated.
See: #418; comments on #253, #783.
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`.
Drop Eq constraint that isn't needed.
Drop the redundant Maybe from findZ return type. Breaks symmetry but
makes it easier to use (join no longer needed).
* Explicitly import pure, (<$>), (<*>) and (<$) from Control.Applicative.
* Use DeriveDataTypeable pragma.
* Remove type signature from pattern synonym.
