GNU bug report logs - #44818
Say "Consider switching so-long mode on" when detecting long line files

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From: Richard Stallman <rms <at> gnu.org>
To: Devon Sean McCullough <Emacs-hacker2018 <at> jovi.net>
Cc: 44818 <at> debbugs.gnu.org
Subject: bug#44818: 27.0.91; wedged
Date: Tue, 01 Dec 2020 23:32:05 -0500

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  > P.S.  Redisplay should never take > 50 ms.
  > Perhaps it would have completed in 51 ms
  > but usually it takes minutes, hours,
  > days or weeks to complete, running
  > at 100% CPU with fans roaring.

This might be a good idea.  But the simple way is not an adequate fix.
If all Emacs does is interrupt redisplay, the next redisplay
will run into the same problem and get stuck again.

I wonder if it is possible to detect that a single line has taken too
long, and set a flag to truncate long lines in that buffer.
Perhaps set truncate-lines.

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

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