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From: Michael Heerdegen <michael_heerdegen@web.de>
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: Sun, 08 May 2022 07:35:36 +0200
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Michael Heerdegen <michael_heerdegen@web.de> writes:

> I suggest to try M-: (require 'longlines) RET M-x longlines-mode RET.

Please try with these settings:

  (setq-default so-long-target-modes t)
  (setq-default so-long-action 'longlines-mode)
  (setq-default longlines-show-hard-newlines t)
  (global-so-long-mode +1)

That should make opening and editing your file work ok out of the box.
All newlines not explicitly indicated (most of them) are "virtual" and
not included when saving.

Michael.