bug#55684: 29.0.50; wrong-type-argument in minibuffer-only frames

[Eli Zaretskii]

> Cc: Alan Mackenzie <acm@muc.de>
> Date: Fri, 27 May 2022 16:09:13 -0400
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Package: Emacs
> Version: 29.0.50

Doesn't the same problem exist on the emacs-28 branch?  I can
reproduce it there.

> -    Fset_frame_selected_window (frame, call1 (Qget_mru_window, frame), Qnil);
> +    {
> +      Lisp_Object w = call1 (Qget_mru_window, frame);
> +      if (!NILP (w))            /* Can be nil in minibuffer-only frames.  */
> +        Fset_frame_selected_window (frame, w, Qnil);

The NILP(w) test should probably be WINDOW_LIVE_P(w).  Martin, do you
agree?