Re: window-next-buffers

[martin rudalics]

> IIUC, the functions window-next-buffers and set-window-next-buffers (and
> the corresponding next_buffers slot) exist for navigating "forward" in
> the window history list, via switch-to-next-buffer, after doing
> switch-to-prev-buffer.
>
> Maintaining separate prev-history and next-history lists is not very
> Emacs-y.  Why isn't this a ring?

Because `window-previous-buffers' returns a list of <buffer window-start
pos> triples where the latter two are markers and `window-next-buffers'
a plain list of buffers.  Maintaining markers is expensive, so I wanted
to reduce the overhead for the next buffers part of the list.

martin