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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Suggest installing more fonts?
Date: Sat, 17 Oct 2020 18:18:29 +0300
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Cc: ghe@sdf.org, larsi@gnus.org, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwv8sc4q4p9.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: ghe@sdf.org,  larsi@gnus.org,  emacs-devel@gnu.org
> Date: Sat, 17 Oct 2020 11:04:23 -0400
> 
> I didn't mean "struct glyph", no.  I was thinking about putting a test
> in the place where we *draw* a tofu char.  I can't find that code right
> now, tho, so I don't know if that would be workable.

The code is in xdisp.c:produce_glyphless_glyph.