bug#49782: 28.0.50; set-fontset-font crashes in init (server)

[Benjamin Riefenstahl <b.riefenstahl@turtle-trading.net>]

Hi Eli,

Eli Zaretskii writes:
> Does the patch below prevent the crash?
>
> diff --git a/src/fontset.c b/src/fontset.c
> index 332be6c..52c7e38 100644
> --- a/src/fontset.c
> +++ b/src/fontset.c
> @@ -1356,6 +1356,9 @@ check_fontset_name (Lisp_Object name, Lisp_Object *frame)
>    int id;
>    struct frame *f = decode_live_frame (*frame);
>  
> +  if (!FRAME_WINDOW_P (f))
> +    error ("Can't use fontsets in non-GUI frames");
> +
>    XSETFRAME (*frame, f);

This works.  At least it tells what the problem is.  The error could
even be caught.  But what I actually want is probably
display-multi-font-p, right?

Thanks, benny