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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Adding colour when font-lock in disabled
Date: Fri, 09 Dec 2022 14:36:39 +0200
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 (message from Heime on Fri, 09 Dec 2022 12:27:22 +0000)
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> Date: Fri, 09 Dec 2022 12:27:22 +0000
> From: Heime <heimeborgia@protonmail.com>
> Cc: help-gnu-emacs@gnu.org
> 
> What if I try to do something different.  Making a buffer for a package where users are not expected to change it.  For instance, a package could make a named buffer that logs some operations, with certain things coloured.  The faces would not change dynamically because users cannot edit the buffer text.

Then you don't need font-lock.  Just place your faces after turning
off font-lock.