bug#6204: vc-dir always splits the frame

[Juri Linkov]

>> Rather than let-binding some Lisp-manipulated "config" var, I was
>> thinking of passing special parameters to display-buffer (I'd rather
>> avoid dynamic scoping whenever possible).
>
> An additional argument is always fine with me.

Why not use the existing argument `other-window'
of `pop-to-buffer' and `display-buffer'?

> Remains the question how to make customizing monsters like
> `special-display-regexps' simpler.

Very simple: allow users to override the argument `other-window' of
`pop-to-buffer' and `display-buffer' by the analogous parameter
`other-window' in `special-display-regexps', e.g.

  ("*vc-dir*" (other-window . t))
  ("*vc-diff*" (other-window . nil))
  ("*info*" (other-window . lru))
  ...

-- 
Juri Linkov
http://www.jurta.org/emacs/