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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Word wrap for non-whitespace-seperated language
Date: Wed, 04 Mar 2020 21:16:54 +0200
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Cc: emacs-devel@gnu.org
To: Yuan Fu <casouri@gmail.com>
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 Yuan Fu on Wed, 4 Mar 2020 13:51:41 -0500)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Wed, 4 Mar 2020 13:51:41 -0500
> Cc: emacs-devel@gnu.org
> 
> Thanks, where is it located? Is it deeply integrated?

You are asking about word wrap?  It's part of the basic layout code in
the display engine, search xdisp.c for WORD_WRAP.