GNU bug report logs - #56682
Fix the long lines font locking related slowdowns

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From: Juri Linkov <juri <at> linkov.net>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 56682 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>, Stefan Monnier <monnier <at> iro.umontreal.ca>, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: bug#56682: locked narrowing
Date: Tue, 06 Dec 2022 19:14:17 +0200

> 2. after starting Isearch at a large column number,
>    Emacs hangs up indefinitely, e.g. with
>    'M-g TAB 10000000 RET C-s' then even C-g doesn't get out.
>    Debugging shows that the problem is in 'isearch-update'
>    where the call to 'pos-visible-in-window-group-p' doesn't return.
>    When this call is removed, the search is instantaneous.

There is another side-effect: after evaluating manually
'M-: (pos-visible-in-window-p) RET' at the position 1000000,
point moves to the position 749873 afterwards.  It seems
this is related to locked narrowing, because point doesn't jump
after customizing long-line-locked-narrowing-region-size to 0.

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