bug#49776: 28.0.50; Incorrect username completion results reported by `read-file-name-interal`

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> (read-file-name-internal "~/foo/~man" nil t)
>> => (#("/foo/~man/" 0 9 (face completions-common-part)))
>
> Yup,. that's wrong.

I'm completely unfamiliar with this code...

(defun completion-table-with-quoting (table unquote requote)
...
           (boundary (car (completion-boundaries ustring table pred "")))
           (completions
            (completion--twq-all
             string ustring completions boundary unquote requote))

ustring here is "~man", and the boundary is 1, so completion--twq-all
returns "/foo/~man" (because it stripped off 1 character at the start).

But it should have stripped off "~/foo/~", I think?  Somehow?

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