[xmonad] darcs patch: switch to nested stacks

[Don Stewart]

droundy:
> Hi all,
> 
> Here's a patch that switches to nested stacks in xmonad core.  I haven't
> converted the test suite, because I've got quickcheck 2 installed, and
> therefore can't compile the test suite, and I don't intend to uninstall
> QC2.  If this code works as intended (I haven't tried running it either),
> then it shouldn't change xmonad behavior.  I haven't adjusted the
> LayoutClass to handle nested layouts, so there is considerable work to be
> done (and not by me, I really should be focussing on darcs, but compiling
> takes a while, particularly when I have to do actual work on my laptop due
> to a sketchy internet connection).
> 
> But I think my ideas are down there.  It's a reasonably simple data
> structure.  And it ought to be a clean solution for handling the float
> layer, besides allowing nested layouts to be implemented cleanly.  I
> haven't implemented full navigation within nested layouts, but that's not
> hard to implement, and can also be implemented in contrib (or later), if
> this is accepted.
> 
> The other reason I've put so little work on this, is that it's not at all
> clear whether the core xmonad developers would accept a patch implementing
> this feature, regardless of how well-tested, well-documented, etc it is.
> So that's what we really need to hear (we being those of us who want this
> feature, especially those who would be willing to take over its
> development).

Thanks David. We can't look a this for 0.6 (coming out after new
year's).

However, I'm heading off on vacation for two weeks, and will play with
this. We've a long open ticket for fixing the floating layer, so this
looks like a good start.

Thanks!

-- Don