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

From: Eli Zaretskii
Subject: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)
Date: Mon, 15 Aug 2022 05:35:37 +0300 
> Cc: 57207@debbugs.gnu.org, yantar92@gmail.com
> Date: Sun, 14 Aug 2022 20:31:03 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> Maybe we should measure the increment in MODIFF across the calls to
> fontification-functions in handle_fontified_prop, and correct
> UNCHANGED_MODIFIED by the same increment when fontification-functions
> return?

Hmm... I'm having second thoughts on this idea.  Let me think some
more.
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