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bug#56682: Fix the long lines font locking related slowdowns

From: Dmitry Gutov
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 16 Aug 2022 13:57:18 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 
On 16.08.2022 05:45, Eli Zaretskii wrote:

If we apply narrowing in handle_fontified_prop (or like in the
attachment), and also in font-lock-fontify-region, it seems like every
significant (*) execution path will go through two repetitions of the
same logic.

That's not ideal.

But not a catastrophe, either.


I suppose not.
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