bug#65356: 30.0.50; [wishlist] Support Tramp method, user name and host name completion in eshell

[Michael Albinus]

When we open a file with find-file, the minibuffer offers method, user
name and host name completion for remote files. That is, after typing
"C-x C-f /ss TAB" we're offered with the completions "ssh:", "sshfs:"
and "sshx:". Same for user name and host name.

In eshell, this feature does not exist. I would like if I could type
"cd /ss TAB" and could see the same offering of "ssh:", "sshfs:" and
"sshx:". Same for user name and host name.

The appended patch does this for me. I have no idea how good it fits
into the eshell machinery, for example whether there are problems with
the em-elecslash.el module. Comments welcome!

Disclaimer: The idea has appeared on
<https://emacs.stackexchange.com/questions/78479/can-eshell-provide-tramp-auto-completion>.

Best regards, Michael.


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.8) of 2023-08-15 built on gandalf
Repository revision: 5c101b1adac2b4f3cc4e08a6492b406952c529f3
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12201009
System Description: Fedora Linux 38 (Workstation Edition)

Configured using:
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