bug#50387: Possible bug in Tramp or in completions

[Gregory Heytings]

> Alas it doesn't.
>
> emacs -Q -l tramp --eval "(add-to-list 'completion-styles 'substring)"
>
> C-x C-f /scp: TAB
>
> still shows "Sole completion".

Sorry, I typed too fast.  It displays two completion candidates: "pscp:" 
and "scp:", which is not what one expects at that point.

With tramp-default-method set to "ssh", C-x C-f /ssh: TAB still displays 
"Sole completion".