Subject: bug#22739: 25.0.50; Hangs on revertig buffer

From: Eli Zaretskii <[email-masked]>
Date: Sun, 06 Mar 2016 05:41:36 +0200

> From: Óscar Fuentes <[email-masked]>
> Cc: [email-masked]
> Date: Sun, 06 Mar 2016 02:28:29 +0100
> 
> So it is the old problem with very long lines. We should try to bail out
> when processing this type of lines takes too much time. From certain
> point, simply refusing to display the line (or the entire file) is
> preferable to freezing Emacs.

We don't have any mechanism in the display engine for "refusing to
display a line", AFAIK.