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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Emacs freezes when editing a file with one extremely long line
 even with so-long-minor-mode enabled.
Date: Sat, 07 May 2022 10:09:37 +0300
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 (message from Hongyi Zhao on Sat, 7 May 2022 14:23:40 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 7 May 2022 14:23:40 +0800
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> On Sat, May 7, 2022 at 2:20 PM Eli Zaretskii <eliz@gnu.org> wrote:
> >
> > Whether there's anything to do here depends on what you want to do
> > with this file; "check" doesn't really explain that.
> 
> I mean, for example, search for some content.

Try "M-x toggle-truncate-lines RET".