Subject: Re: 29.0.50; noverlay branch is O(N) for important calls

From: Eli Zaretskii <[email-masked]>
Date: Fri, 07 Oct 2022 10:09:39 +0300

> From: Stefan Monnier <[email-masked]>
> Cc: [email-masked],  Andreas Politz <[email-masked]>,  Gerd
>  Möllmann <[email-masked]>,  Eli Zaretskii
>  <[email-masked]>
> Date: Thu, 06 Oct 2022 21:12:26 -0400
> 
> [ Site note: `previous-overlay-change` is probably not very important in
>   practice, but `next-overlay-change` OTOH is indeed important because
>   it's used during redisplay.

previous-overlay-change is also called by redisplay (but I didn't see
how frequently), at least if you look at the code from the static
analysis POV.