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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question about display engine
Date: Thu, 08 Aug 2019 20:37:46 +0300
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To: Ergus <spacibba@aol.com>
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> Date: Thu, 8 Aug 2019 10:38:04 +0200
> From: Ergus <spacibba@aol.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> 
> >I now think it would make more sense to add an 'extend-to-window-edge'
> >attribute in the face definition itself.
> 
> I like that option as a concept, but it adds a new flag to a general
> struct like the face for something that only affects the region face
> now.

As mentioned up-thread, this affects not only the region face.  So
perhaps a face attribute is indeed a good solution.

But I still feel that this is not about faces, this is about face
attributes, so the customization should on the attribute level, not on
the face level.