Re: Splitting window displayed in special frame

["rgb" <rbielaws@i1.net>]

On Jan 26, 6:41 am, "Joe" <Johannes.Labi...@gmail.com> wrote:
> Hello,
>
> I have set the variable special-display-buffer-names to
>   (("*SQL*" (width . 139) ))))
> .
> Whenever I create a "*SQL*" buffer, it is displayed in a new frame as
> it should be.
> The only problem is that if something is happening in the mini-buffer
> that creates a (temporary) window, like completion, the buffer
> *Completions* is displayed in a different frame.
> For instance, if I do find-file and press tab to get the file
> completions list, it is displayed in another (existing) frame instead
> of splitting the window temporary as it is done for other windows.
>
> I tried to set special-display-buffer-names to
>   (("*SQL*" (width . 139) (unsplittable . nil))))
> but it had no effect.
>
> It should not act different for *Completions* in the special-displayed
> buffer from *Completions* of a function issued in a normal buffer.
> How can I do that?

I'ts hard to say if this is a bug or there is a good reason but
special-display-popup-frame creates the frame like this:

(make-frame (append args special-display-frame-alist))

If unsplitable is non-nil in special-display-frame-alist it will
appear after your nil version - which gets supplied from args.

Making the frame happens in C code so I can't be sure
exactly how and why but the conflict between the 2 sources
of parameters is almost certainly the cause.
If you're curious, look at x_get_arg, otherwise
you might try reporting it as a bug and see what they say.