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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Fwd: Flymake and the 'face' property
Date: Tue, 29 Jan 2019 21:17:54 +0200
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> From: Johan Bockgård <bojohan@gnu.org>
> Cc: João Távora <joaotavora@gmail.com>,
>   emacs-devel@gnu.org
> Date: Tue, 29 Jan 2019 19:34:08 +0100
> 
> > A 'face' property is documented for general use only for text, not for
> > symbol plists.
> 
> The `category' feature for text/overlays uses symbol plists to define
> its default properties. `face' is probably one the more common
> properties to use in a category. Let's see...
> 
> 
> ...a few minutes later, I find this in rng-valid.el:
> 
> 
> (defface rng-error '((t (:inherit font-lock-warning-face)))
> [...]
> (overlay-put overlay 'category 'rng-error)
> [...]
> (put 'rng-error 'face 'rng-error)

I don't see how this contradicts what I said.  Do you?