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

[Dmitry Gutov]

On 27.12.2020 18:22, Juri Linkov wrote:
> > On the subject of grep-mode, it could have a similar command introduced
> > too, for situations when you only needed to find one occurrence, to jump to
> > it and quit the window.
> This is what I already successfully use:
>
> diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
> index d2293151c7..08c44dcb25 100644
> --- a/lisp/progmodes/compile.el
> +++ b/lisp/progmodes/compile.el
> @@ -2572,11 +2572,15 @@ compile-goto-error
>     (or (compilation-buffer-p (current-buffer))
>         (error "Not in a compilation buffer"))
>     (compilation--ensure-parse (point))
> +  (let ((window (posn-window (event-end event))))
>       (if (get-text-property (point) 'compilation-directory)
>           (dired-other-window
>            (car (get-text-property (point) 'compilation-directory)))
>         (setq compilation-current-error (point))
> -    (next-error-internal)))
> +      (next-error-internal))
> +    (when current-prefix-arg
> +      (with-selected-window window
> +        (quit-window)))))

So... if others like it, we could keep just this binding (C-u RET) for 
"quit the window and go to location", in both Grep and Xref.