This adds the function `killOthers`, which kills all unfocused windows
on the current workspace.
As discussed in the PR itself [1], the module suffix `WithAll` is not
quite optimal at this point, as we are acting on window _groups_ and not
necessarily just all window on a workspace. However, in order to keep
this commit atomic, this consideration is postponed until another day.
[1]: https://github.com/xmonad/xmonad-contrib/pull/602
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`.
