Subject: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)

From: Lars Ingebrigtsen <[email-masked]>
Date: Sun, 21 Aug 2022 14:47:15 +0200

The [Narrow] mode line problem is gone on the new branch, but the
blank-window problem isn't: If you type something before the "foo" bit
in the test case, the portion of the window below the foo will blank in
and out.  (Type something below foo first to see the effect.)