bug#6204: vc-dir always splits the frame

[Stefan Monnier]

>> If the buffer names are sufficiently regular and unique,
>> special-display-regexps can already provide the needed
>> customizability without any need for a new option.
> What about cases where buffer names are not regular and unique?

Don't know: where are they?

> Also, I'm afraid we currently ignore the fact that most users are simple
> not prepared to invest their time in studying the semantics of an option
> like `special-display-regexps'.

The Custom :type could be improved to make it easier to specify common
parameters, indeed.

> Finally, this and `special-display-buffer-names' are user options and we
> again have the problem that an application binding that (or, worse,
> permanently adding its buffer names to it) may conflict with users
> expectations (or, worse, getting her the CHANGED outside Customize
> annyoances).

No elisp code should touch it.  It's exclusively for
user-customizations.  Applications should pass special args to
pop-to-buffer/display-buffer instead to specify its favorite
default behavior.


        Stefan