bug#57207: closed (29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling))

[GNU bug Tracking System]

Your message dated Thu, 08 Dec 2022 10:05:58 +0000
with message-id <a14f4d136f03f1180913@heytings.org>
and subject line Re: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 
(Improvements to long lines handling)
has caused the debbugs.gnu.org bug report #57207,
regarding 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long 
lines handling)
to be marked as done.

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57207: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=57207
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> --- Begin Message ---
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> Subject: 
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> 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)
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> Date: 
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> Sun, 14 Aug 2022 23:55:46 +0800
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> I am experiencing severe performance degradation on current master.
>
> The degradation happens when working with Org files and I managed to
> bisect the cause down to
>
> e7b5912b235936b304701ba6b1e808d9b197fd4f is the first bad commit
> commit e7b5912b235936b304701ba6b1e808d9b197fd4f
> Author: Gregory Heytings <gregory@heytings.org>
> Date:   Sat Jul 16 19:06:38 2022 +0000
>
>     Improvements to long lines handling.
>     
>     * src/buffer.h (struct buffer): New field 'long_line_optimizations_p'.
>     
>     * src/buffer.c (syms_of_buffer): New variable 'long-line-threshold'.
>     (reset_buffer): Initialize the 'long_line_optimizations_p' field.
>     (Fbuffer_swap_text): Handle it.
> ...
>
> I tried M-x profiler to find the cause, but the 3-4 second hangs are not
> reflected in the profiler report.
>
> debug-on-entry + manual stepping through the function revealed that the
> hang happens when calling jit-lock-fontify-now.
>
> I was able to trigger the slowdown when unfolding headlines hidden using
> 'invisible text property.
>
> Do you have any idea what could be going wrong or how to debug things further?
>
> -- 
> Ihor Radchenko,
> Org mode contributor,
> Learn more about Org mode at https://orgmode.org/.
> Support Org development at https://liberapay.com/org-mode,
> or support my work at https://liberapay.com/yantar92
>
>
>
> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)
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> Date: 
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> Thu, 08 Dec 2022 10:05:58 +0000
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> Ihor confirmed (privately) that this bug is fixed.  Closing.
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> --- End Message ---