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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fill column indicator functionality
Date: Sat, 04 May 2019 19:32:05 +0300
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In-reply-to: <83k1f6ky6u.fsf@gnu.org> (message from Eli Zaretskii on Sat, 04
	May 2019 18:59:37 +0300)
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> Date: Sat, 04 May 2019 18:59:37 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: ofv@wanadoo.es, emacs-devel@gnu.org
> 
> What about the case there's no stretch, i.e. the indicator directly
> follows the last character of the line?

More generally, I think the change you propose will have the indicator
merge the attributes of any face of the last character, not just when
its the region face.  Maybe that is what is wanted, I don't know.