bug#6204: vc-dir always splits the frame

[Stefan Monnier]

>> Yes, I'm picturing the special arg as (conceptually) two alists, and
>> that we'd combine with the user's own setting via something like
>> (append override-params
>> (lookup special-display-regexps)
>> default-params)

> Good.  Now how do `pop-up-windows', `pop-up-frames', and
> `display-buffer-reuse-frames' fit into this?

I'd force display-buffer-reuse-frames to t and forget about it ;-)

> I suppose these are the values for all buffers not mentioned by
> `special-display-regexps'.

Pretty much, yes.

> What if `pop-up-windows' is nil and "default-params" indicates that
> the application wants to pop up a window (but does not insist).
> Probably `pop-up-windows' should prevail in this case.

No, the application's choice should prevail because it's more specific.


        Stefan