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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Future of display engine and lines
Date: Mon, 25 Oct 2021 15:50:48 +0300
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In-Reply-To: <3289249.facs6qH1zK@galex-713.eu> (message from Alexandre Garreau
 on Mon, 25 Oct 2021 14:20:35 +0200)
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> From: Alexandre Garreau <galex-713@galex-713.eu>
> Cc: rms@gnu.org, larsi@gnus.org, emacs-devel@gnu.org
> Date: Mon, 25 Oct 2021 14:20:35 +0200
> 
> In a way you may not be imagining: both column contents could be 
> unrelated

If they are unrelated, you are talking about a different use case,
where each column comes from a different buffer.