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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Line wrap reconsidered
Date: Tue, 26 May 2020 22:59:15 +0300
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Cc: emacs-devel@gnu.org, monnier@iro.umontreal.ca, yantar92@gmail.com
To: Yuan Fu <casouri@gmail.com>
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In-Reply-To: <588B0093-2AA8-4B3C-9B27-99EEDF919663@gmail.com> (message from
 Yuan Fu on Tue, 26 May 2020 15:10:17 -0400)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Tue, 26 May 2020 15:10:17 -0400
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
>  yantar92@gmail.com,
>  emacs-devel@gnu.org
> 
> > Of course, there is: the major mode is the one that creates the table,
> > doesn't it?  So the mode knows where the table is.
> 
> Yes, the major mode knows, but the redisplay code doesn’t. So presumably the major mode tells the redisplay code what to do (truncate or wrap) by adding text properties to the text.

The major mode could do this using techniques similar to the old
longlines.el package, for example.