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

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Message #2133 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 56682 <at> debbugs.gnu.org, gregory <at> heytings.org, monnier <at> iro.umontreal.ca
Subject: Re: bug#56682: feature/improved-locked-narrowing 9dee6df39c:
 Reworked locked narrowing.
Date: Mon, 30 Jan 2023 19:56:44 +0200

>> For example, when there is at least one long line near the end of
>> a diff-mode buffer, then sometimes the buffer gets truncated,
>> 'diff-hunk-file-names' returns nil on diff headings,
>> and there are a lot of such errors in the Messages buffer:
>>
>>   Error during redisplay: (jit-lock-function 1) signaled (args-out-of-range #<buffer *vc-diff*> 1118 1370)
>>   ...
>>
>> Maybe it's still possible to fix this?
>
> We can and should fix this and other problems, but only if they are
> reported.  Would you please file a bug report for any such problem you
> find?

I noticed this problem only in one commit last week, but didn't realize
it's caused by long lines.  I had time to debug it only today.
Now could try to create a minimal test case.

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