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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Stop frames stealing eachothers' minibuffers!
Date: Sat, 20 Mar 2021 16:01:43 +0200
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Cc: acm@muc.de, emacs-devel@gnu.org, jakanakaevangeli@chiru.no, rudalics@gmx.at
To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwvy2ei3p8m.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Sat, 20 Mar 2021 09:55:02 -0400)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Sat, 20 Mar 2021 09:55:02 -0400
> Cc: rudalics@gmx.at, Eli Zaretskii <eliz@gnu.org>, jakanakaevangeli@chiru.no,
>  emacs-devel@gnu.org
> 
> > I still can't find a way of identifying the initial frame for sure - it
> > lacks a 'display frame parameter, but so do ordinary frames on a tty.  It
> > lacks a 'client frame parameter, but so do ordinary frames when Emacs is
> > started normally and M-x server-start invoked.
> 
> xdisp.c uses
> 
>     FRAME_INITIAL_P (SELECTED_FRAME ())

Right.  Just use a frame pointer argument instead of SELECTED_FRAME(),
i.e.

   struct frame *f;
   ...
   if (FRAME_INITIAL_P (f))
     ...