bug#65902: 29.0.92; emacsclient-mail.desktop fails due to complicated escaping

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 13 Sep 2023 14:08:01 +0000 (UTC)
> From: Spencer Baugh <sbaugh@catern.com>
> Cc: 65902@debbugs.gnu.org
> 
> On Sep 13, 2023 09:26, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>  > I am not sure what you're suggesting.  Can you show how the equivalent 
>  > of: 
>  > 
>  > emacsclient --apply message-mailto -- %u 
>  > 
>  > would work with that design? 
> 
>    emacsclient --qeval '(message-mailto %u)'
> 
> I don't think this can work in general for arbitrary user input: what if %u is replaced with something
> that contains parentheses?

They are inside '..', so the only one who'd care is Emacs, not the
shell.  In which case it's the job of whoever provides the value for
%u to handle that.

And anyway, how is that different from the same problem happening with
your suggested --funcall or --apply? they will bump into the same
issues.

>  Let's not do that this time, okay?
> 
> Agreed, I think we reached a consensus in that bug and now I am implementing that consensus.

AFAIU, there was no consensus reached there, so I'm unsure what are
you alluding to here.