GNU bug report logs - #61215
29.0.60; font-lock broken in diff-mode with long lines

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From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Gregory Heytings <gregory <at> heytings.org>, 61215 <at> debbugs.gnu.org
Subject: bug#61215: 29.0.60; font-lock broken in diff-mode with long lines
Date: Mon, 27 Feb 2023 20:28:33 +0200

>> After debugging I discovered that the problem is not caused by font-lock
>> in diff-mode.  The problem is in easy-mmode-define-navigation.
>> diff-mode uses it to navigate diff hunks.  It supports such a feature
>> that when the user narrowed the diff buffer, it puts narrowing back
>> after moving to the next hunk.  But this fails when the diff buffer
>> is narrowed automatically by long-line-optimizations.  If there is
>> no way to distinguish whether the narrowing is automatic by long-lines
>> or manual by the user, this patch fixes the problem.  It works without
>> errors, and even highlights first 250000 characters of the long line:
>
> Thanks.
>
> Maybe Gregory (CC'ed) can help here and tell whether there's a better
> solution.

It seems there is no better solution?

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