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

[Eli Zaretskii <eliz@gnu.org>]

> From: sbaugh@catern.com
> Date: Wed, 13 Sep 2023 02:30:08 +0000 (UTC)
> 
> This patch avoids the complicated scripting needed for
> emacsclient-mail.desktop by adding a new flag to emacsclient, --funcall,
> which mirrors emacs --funcall and allows emacsclient-mail.desktop to be
> basically the same as emacs-mail.desktop.
> 
> I expect this to also be useful in other places; the need to escape
> arbitrary inputs before passing them to emacsclient is frequently
> annoying.

Is quoting the only issue with --eval?  If so, why not have a variant
of --eval that quotes the argument by itself, like you do in the
patch, i.e. by using quote_argument, instead of inventing yet another
weird option with its own small DSL and extra-special rules of how to
write the command line with it?

More generally, I cannot say I'm happy that we basically are
reiterating everything that was said in bug#57752 instead of picking
up where it left off.  Why is it useful to have another discussion
like that one (which will probably end up at the same impasse)?