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From: martin rudalics <rudalics@gmx.at>
Newsgroups: gmane.emacs.help
Subject: Re: MY window tree!
Date: Sun, 14 Jan 2007 12:26:58 +0100
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 > I have uploaded a preliminary version of winsav.el to
 >
 >   http://ourcomments.org/Emacs/DL/elisp/test/winsav.el
 >

The problem is that the split-windows below will create *new* windows
rather than "reuse" the old ones.  Hence any overlay relationships and
other window-local things get broken by this.

       (dolist (subtree (cdddr saved-tree))
         (add-to-list 'wtree
                      (cons
                       (if ver
                           (split-window-vertically)
                         (split-window-horizontally))
                       subtree)
                      t)

IMO there's no way around retaining sequence numbers of windows when
saving and restoring window trees.  Hardly possible when done at the
Lisp level.