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

[Stephen Berman]

On Fri, 20 Jul 2018 17:56:12 +0300 Eli Zaretskii <eliz@gnu.org> wrote:

>> 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?

I'm afraid not:

0. emacs -Q
1. M-x cd RET /tmp/ RET
2. C-x d /~s TAB

results in this minibuffer display:

Dired (directory): /tmp//~s█[No match]

with '/tmp/' in shadow face and '/~s' in default face.  Same thing with
any other value of default-directory I've tried.

Steve Berman