bug#44611: Prefix arg for xref-goto-xref

[Dmitry Gutov]

On 17.03.2021 19:23, Juri Linkov wrote:
> > >     (defun next-error-quit-window ()
> > >       (when (and (eq current-prefix-arg 0)
> > >                  (not (eq next-error-last-buffer (current-buffer))))
> > >         (let ((window (get-buffer-window next-error-last-buffer)))
> > >           (when (window-live-p window)
> > >             (with-selected-window window
> > >               (quit-restore-window window))))))
> > >     (add-hook 'next-error-hook 'next-error-quit-window)
> >
> > Since next-error-hook is a defcustom, perhaps we can/should include this
> > function as one of the advertised values in :type?
> >
> > Even if we keep the list nil by default.
>
> I completely forgot that we have 'next-error-found-function',
> so implemented it with 'next-error-hook'.  I don't remember
> why we have both.

next-error-found-function was added recently, and I guess it's handy to 
have FROM-BUFFER and TO-BUFFER available.

I can't find any specific previous uses for it, though.

> Anyway, here is a patch with corrections from Martin:

LGTM.