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`.
This enables adding the Typeable constraint to LayoutClass itself
(https://github.com/xmonad/xmonad/pull/242) which in turn enables
querying the current layout state. That might be useful to e.g. show the
current X.L.WorkspaceDir in xmobar.
This is a preparation commit that fixes the compile failures that would
result in merging that change to xmonad. For this to be generally useful
we first need to merge (and ideally also release) that xmonad change,
and then we'll need some documentation and perhaps a type class to help
find the right LayoutModifier in the tree of ModifiedLayouts and
Choices. That will come later.
This patch adds the possibility to update the state of a layout modifier when
modifying the underlying layout before it is run(i.e. using modifyLayout).
The modified state is also passed to the subsequent call of redoLayout, whose
return takes precedence if both functions return modified states of the layout
modifier.
This removes the emptyLayoutMod method from the LayoutModifier class, and
change the Stack parameter to redoLayout to a Maybe Stack one. It also changes
all affected code. This should should be a refactoring without any change in
program behaviour.
Many layouts are written as layout modifiers because they need to
change the stack of the rectangle before executing doLayout.
This is a major source of bugs. all layout modifiers should be using the
LayoutModifier class. This method (modifyLayout) can be used to
manipulate the rectangle and the stack before running doLayout by the
layout modifier.
