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

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Thu, 19 Jul 2018 19:55:18 +0200
> 
> 0. emacs -Q
> 1. C-x d / ~ TAB
>    This pops up a *Completions* buffer showing directory names of all
>    members of (system-users), e.g. steve/
> 2. Continuing from step 1, when I type any of 's TAB', 'st TAB', 'ste
>    TAB' or 'stev TAB', Emacs responds with [No match], but 'steve TAB'
>    completes to steve/
> 
> The failure only happens with '/~<partial-name>', typing e.g. '~/Downl
> TAB' here completes to ~/Downloads/

Doesn't happen here, FWIW.  Strange.