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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question: add-face-text-property for 'font-lock-face?
Date: Sun, 29 Aug 2021 10:05:29 +0300
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To: Qiantan Hong <qhong@mit.edu>
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In-Reply-To: <D4EB168C-176C-4231-B642-523D73C4E4B8@mit.edu> (message from
 Qiantan Hong on Sun, 29 Aug 2021 04:13:40 +0000)
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> From: Qiantan Hong <qhong@mit.edu>
> Date: Sun, 29 Aug 2021 04:13:40 +0000
> Accept-Language: en-US
> 
> Users of crdt.el report that crdt-visualize-author-mode (which use font-lock-face to color code author of texts)
> conflict with faces from other modes. Apparently there are more than 1 mode which sets this text property.
> 
> Is there some way to add-face-text-property to 'font-lock-face property, 
> i.e. adding new face attributes instead of overwriting any existing face?
> add-face-text-property doesn’t seem to work because 'font-lock-face will just override ‘face.

I don't think I understand well enough what you want to do, but in
general, you change a face's attribute by using set-face-attribute.