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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: How do I get rid of a face defined with defface?
Date: Sun, 21 Jul 2019 05:30:12 +0300
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To: Noam Postavsky <npostavs@gmail.com>
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 (message from Noam Postavsky on Sat, 20 Jul 2019 17:56:16 -0400)
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> From: Noam Postavsky <npostavs@gmail.com>
> Date: Sat, 20 Jul 2019 17:56:16 -0400
> Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
> 
> (setq face-new-frame-defaults
>       (assq-delete-all 'c-debug-is-sws-face face-new-frame-defaults))
> 
> which seems to work.

I don't think you can do that safely, because the face could be used
by some frames.