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`.
Establish active asynchronous pointer grab before entering infinity cycle.
Because xmonad already has passive synchronous pointer grab, this overwrites
it temporary and avoids freezing X, when button press occurs after submap key
press.
Also, terminate submap at button press in the same way, as we do for wrong key
press.
If an action that requires the keyboard to be grabbed (e.g., launching dmenu),
it is a race when submapping the action as to whether the action will have
access to the keyboard or not. To fix this, the keyboard should be ungrabbed
before executing the action.
