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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question about display engine
Date: Sat, 07 Sep 2019 10:55:14 +0300
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> Date: Sat, 07 Sep 2019 10:37:07 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: spacibba@aol.com, emacs-devel@gnu.org
> 
> The default face should always be merged into the face used for line
> extension, that goes without saying.

IOW, the default face should always be treated as having the :extend
attribute by default.