GNU bug report logs - #46558
Interaction between font-lock-extend-region-wholelines and font-lock-extend-region-multiline

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Sébastien Miquel <sebastien.miquel <at> posteo.eu>
To: bug-gnu-emacs <at> gnu.org
Subject: Interaction between font-lock-extend-region-wholelines and
 font-lock-extend-region-multiline
Date: Tue, 16 Feb 2021 13:13:17 +0100

Hi,

In org-mode, blocks are fontified with the font-lock-multiline
property. When editing the line right before a block, the whole block
is needlessly refontified (use highlight-refontification-mode to
check).

This is because the font-lock-extend-region-wholelines extends the
region to the beginning of the next line, which has the
font-lock-multiline property. Then font-lock-extend-region-multiline
extends the region to the end of the block.

If a second block follows the first one, with no empty line between,
it is refontified as well.

Maybe font-lock-extend-region-multiline should check if the char
right before font-lock-end has the font-lock-multiline property as
well before extending the region. I've tried it, and haven't found any
issue in this use case.

-- 
Sébastien Miquel

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