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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: buffer-face-set changes the fringe, is it a bug?
Date: Thu, 09 Jul 2020 20:14:00 +0300
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In-Reply-To: <E1jtMoQ-0005uW-00@fencepost.gnu.org> (message from Richard
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> From: Richard Stallman <rms@gnu.org>
> Cc: ghe@sdf.org, emacs-devel@gnu.org
> Date: Wed, 08 Jul 2020 23:01:25 -0400
> 
>   >   It is not 
>   > > recommended to omit the @var{face}, as an omitted @var{face} leads to 
>   > > unexpected behavior.
> 
> Why not make that an error instead?

Because it is not an error, it's an entirely valid usage.