bug#55477: 29.0.50; flymake-goto-next-eror shows terminal like color codes in mini buffer

[Eli Zaretskii]

> Cc: Alan Mackenzie <acm@muc.de>, 55477@debbugs.gnu.org,
>  Pankaj Jangid <pankaj@codeisgreat.org>
> Date: Wed, 18 May 2022 13:11:46 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> run "LC_ALL=en_IN emacs -Q", visit the file, evaluate the first form, 
> and then do M-x flymake-mode followed by repeated uses of M-x 
> flymake-goto-next-error. It will eventually report the diagnostic:
> 
> ‘δ-replace-string’ is for interactive use only; use ‘search-forward’ 
> and ‘replace-match’ instead.

Do you understand the significance of en_IN locale in this scenario?
If so, can you point out what aspect of that locale seems to cause
this issue?

Or is the same possible with other locales as well?  If so, what is
common to the problematic locales?

Thanks.