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bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements

From: Lars Ingebrigtsen
Subject: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)
Date: Thu, 18 Aug 2022 16:01:13 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) 
This reproduces for me:

(progn
  (run-at-time 1 1 (lambda ()))
  (pop-to-buffer "foo.txt")
  (text-mode)
  (insert (propertize (make-string 20000 ?x) 'display "foo")))
 
But not in -Q; just with my normal .emacs.  I'll start bisecting.
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