bug#41423: Installing the fix for bug#41423 on emacs-27 (was: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest])

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: andrés ramírez <rrandresf@gmail.com>,
>   41423@debbugs.gnu.org
> Date: Sun, 31 Jan 2021 23:36:09 -0500
> 
> IIUC Michael had marked this bug as "blocking" for Emacs-27, so this
> argues for installing it on the `emacs-27` branch.
> 
> The patch is not without risks seeing how it changes a function from
> returning a list to returning a function and how it fundamentally
> changes *when* the code is executed.  So I'm not sure whether it should
> go on the `emacs-27` branch:
> 
> A- For non-Eshell users it is "obviously safe".
> B- For Eshell-over-Tramp users it should be a clear improvement even if
>    it turns out to introduce some unforeseen regressions in some cases.
> C- Finally, Eshell-not-over-Tramp users should hopefully see no
>    difference at all, which mostly means no improvement to make up for
>    any risk of regression.
> 
> So, is the improvement in B worth the risk in C?

No, I don't think so.