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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: :extend face attribute at EOB without end-of-line char
Date: Mon, 14 Oct 2019 22:47:23 +0300
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To: Juanma Barranquero <lekktu@gmail.com>
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 (message from Juanma Barranquero on Mon, 14 Oct 2019 21:41:46 +0200)
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> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Mon, 14 Oct 2019 21:41:46 +0200
> Cc: spacibba@aol.com, Emacs developers <emacs-devel@gnu.org>
> 
> > No, that was never the intent.  The extension happens only of the face
> > crosses the line boundary, i.e. it "covers" the newline at the end of
> > the line.
> 
> "the line boundary" is a bit ambiguous

That's why I added that it should "cover" the newline.  That's the
meaning of "crosses the line boundary".