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`.
A stack of stacks is a more natural representation of what SubLayouts
does: it packs information about the global focus as well as focus in
individual groups (sublayouts).
It doesn't carry information about the sublayouts themselves (but a
similar structure in X.L.Groups does), so we still use Groups and
fromGroups in some places, but future refactor can simplify that as
well, I'm sure.
My main motivation for this is that I need to expose the window groups
to the user config, and a stack of stacks seems to be a nice data
structure for that. The motivation for exposing the groups is that I
want to manipulate focus in a way that takes groups into account. As an
example, I want the following:
* mod-1, mod-2 to mod-0 switches to n-th group if not already focused,
and if focused, focus next in the group
* show these numbers and window titles in xmobar (like tmux/screen/vim
status line), like so:
1a weechat 1b browser 2 vim 3 mutt
Achieving this just using BoringWindows is quite tricky, but with the
ability to somehow (InspectLayout, which is work-in-progress, or message
with IORef) get the stack of stacks out of SubLayouts, this becomes
easy.
Turns out similar logic is already in updateGroup, and we don't even
need to worry about extra/missing windows and we can just differentiate
the result of reordering.
This makes the following sequence of operations idempotent, as it should be:
windows $ W.float w $ W.RationalRect 0 0 1 1
windows $ W.sink w
Previously, any window not visible to the SubLayout modifier (xmonad
invokes runLayout with tiled windows only) would be reordered to the end
of stack. This commit changes the reordering logic to only reorder
windows in Groups and keep all other windows where they were.
Starting with 5240116f3cdf169e3aa226d9f8206a5f5b99c867 we only support
GHC versions 8.4.4 and up (more precisely, the GHC version associated
with stackage lts-12 and up). The imports in question are now in
Prelude and need not be imported explicitly.
Despite myLayouts currently being more popular in examples, make
them all myLayout as in man/xmonad.hs to avoid mixing them in the
same module as was done a few places, leading to confusion for some users.
