bug#70077: An easier way to track buffer changes

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: 70077@debbugs.gnu.org, casouri@gmail.com, yantar92@gmail.com,
>  qhong@alum.mit.edu, frederic.bour@lakaban.net, joaotavora@gmail.com,
>  mail@nicolasgoaziou.fr, acm@muc.de, stephen_leake@stephe-leake.org,
>  alan.zimm@gmail.com, monnier@iro.umontreal.ca, phillip.lord@russet.org.uk
> Date: Sat, 30 Mar 2024 13:19:31 +0000
> 
> Looking at the implementation of `track-changes--before/after', I can
> see that it is updating the BEFORE string and these updates implicitly
> assume that the changes arrive in order - which is not true in some edge
> cases described in the bug report.

So I guess you have detected a bug in the implementation before it was
even finalized and installed.