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

From: Gregory Heytings
Subject: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)
Date: Sun, 21 Aug 2022 13:38:58 +0000 


emacs -Q and then:

(progn
 (pop-to-buffer "foo.txt")
 (flyspell-mode)
 (insert "\n\n"
          (propertize (make-string 20000 ?x) 'display "foo")
          "\n\nbar\nzot\n")
 (goto-char (point-min)))

Then type `d'.  Everything after "foo" disappears.


It doesn't, here :( Strange...



Wait... now it does!  Thanks!
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