bug#61283: 29.0.60; pcomplete-completions-at-point loses text properties, breaking pcomplete-from-help annotations

[Eli Zaretskii]

> Date: Thu, 18 May 2023 04:01:46 +0200
> Cc: Augusto Stoffel <arstoffel@gmail.com>, Eli Zaretskii <eliz@gnu.org>,
>  61283@debbugs.gnu.org, liuhui1610@gmail.com
> From: Daniel Mendler <mail@daniel-mendler.de>
> 
> Yes, this occurred to me too. I assume relying on the original string
> should work since quoting should not change the string. Options like
> "--color=" are not affected by quoting.
> 
> But this means that the following simple patch to `completion--twq-all'
> also fixes the issue. It ensures that the original string is preserved
> in the common case where string quoting was ineffective. This approach
> may be better than refactoring pcomplete.el. The patch may even be safe
> enough for emacs-29.

Why do you think it will be safe for emacs-29?

And why do we have to fix this in Emacs 29.1?  This only affects
Eshell, AFAIU, is that true?