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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question about display engine
Date: Tue, 13 Aug 2019 18:32:15 +0300
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Cc: spacibba@aol.com, monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: martin rudalics <rudalics@gmx.at>
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In-reply-to: <d85ad354-d29a-c22d-1f5a-94a6cec90f17@gmx.at> (message from
 martin rudalics on Tue, 13 Aug 2019 10:17:52 +0200)
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> Cc: spacibba@aol.com, emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Tue, 13 Aug 2019 10:17:52 +0200
> 
> > ... the face used on the "rest of the line" should be computed by
> > merging the various faces that apply to the corresponding LF character
> > but where the new `extend-to-end-of-line` property is obeyed
> > (i.e. a face is skipped if that property is nil).  IOW the
> > extend-to-end-of-line property is applied *during* merging rather than
> > after it.
> 
> That's the idea.

Are you sure?  It sounds like Stefan was saying the same thing I was
saying: that the decision whether to use or not to use an attribute is
made when we merge the faces, not when we apply the face attributes to
produce the display on the glass.

Or maybe it's me who misunderstood what Stefan meant...