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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 20:58:54 +0300
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To: Juanma Barranquero <lekktu@gmail.com>
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> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Mon, 14 Oct 2019 18:37:22 +0200
> Cc: Emacs developers <emacs-devel@gnu.org>
> 
> No, I don't see a difference. I *expected* a difference. I thought the face would be extended in the last line of
> the buffer up to the right side of the window, even if it had no end-of-line character.

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.

If the documentation doesn't make that clear, please suggest how to
clarify it.