bug#53053: 28.0.90; Tramp completion bug of path /sudo::~/

[Daniel Mendler]

1. emacs -Q
2. C-x f /sudo::~/ (alternatively use an ssh path of a similar form)
3. Open the completion buffer by pressing ?
4. Click/select a directory in the completions buffer

The resulting path looks like this:

/sudo::~dir/

The underlying issue is that somewhere a wrong completion boundary is
reported by the Emacs completion table for non-normalized file paths
which contain ~. This issue also affects other completion UIs. The issue
is present on both 27 and 28.

(Original report: https://github.com/minad/vertico/issues/174)

In GNU Emacs 28.0.90 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.5,
cairo version 1.16.0)
 of 2022-01-01 built on projects
Repository revision: efb1c7ec379430f560c5b801969ae43023c52734
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)