bug#32215: 27.0.50; Minibuffer completion fails with /~<partial-name>

[Eli Zaretskii <eliz@gnu.org>]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  32215@debbugs.gnu.org
> Date: Fri, 20 Jul 2018 16:28:15 +0200
> 
> Nothing is removed.  To be explicit, when I start with -Q and type 'C-x
> d', the minibuffer displays this:
> 
> Dired (directory): ~/
> 
> with point after '/'.  When I now type '/', the face of '~/' changes to
> shadow, and when I then type '~', the face of the second '/' also
> changes to shadow.  When I now type TAB, the minibuffer looks like this:
> 
> Dired (directory): ~//~
> 
> with '~//' in shadow face, and a *Completions* buffer pops up and shows
> the directory names of all members of (system-users).  When I now type
> 's TAB', the face of the second '/' changes from shadow to default
> (black), '[No match]' appears after the cursor and the *Completions*
> buffer disappears.  I.e., the minibuffer looks like this on hitting TAB:
> 
> Dired (directory): ~//~s█[No match]
> 
> with '~/' in shadow face and '/~s' in default face, and after a couple
> of seconds, '[No match]' disappears, leaving the rest.

Ah, I think I understand why I couldn't reproduce the problem: it
seems to only happen if default-directory is "~/" before starting the
recipe.  If it is something else, the problem doesn't happen.  Can you
confirm?