bug#66114: [PATCH] Fix interactive prompt for selecting checkout directory

[Philip Kaludercic <philipk@posteo.net>]

Joseph Turner <joseph@breatheoutbreathe.in> writes:

> Joseph Turner <joseph@breatheoutbreathe.in> writes:
>
>> Philip Kaludercic <philipk@posteo.net> writes:
>>
>>> Joseph Turner <joseph@breatheoutbreathe.in> writes:
>>>
>>>>                                                  However, the behavior of
>>>> read-file-name is unspecified when a MUSTMATCH function returns nil:
>>>>
>>>> - a function, which will be called with the input as the
>>>>   argument.  If the function returns a non-nil value, the
>>>>   minibuffer is exited with that argument as the value.
>>>>
>>>> Is this a bug, a case of under-documentation, or do I misunderstand something?
>>>>
>>>> I'm happy to post this in a separate bug thread if you think it's worth it.
>>>
>>> Perhaps that would be worth doing, that way the people who know more
>>> about completion than I do would be more likely to see it and help
>>> out.
>>
>> Okay, thanks! I'll do that.
>
> Now that #66187
> (<https://yhetil.org/emacs-bugs/87cytlqmqh.fsf@breatheoutbreathe.in/>)
> and bug#68815
> (<https://yhetil.org/emacs-bugs/8734ufyxoy.fsf@breatheoutbreathe.in/>)
> are fixed on emacs-29, I'm revisiting this issue.
>
> With the following patch, the interactive prompt in package-vc-checkout
> now offers all directory for completion (empty or not), but only exits
> when the minibuffer contains an empty directory or nonexistent filename.
>
> Testing this patch requires checking out emacs-29 after e6c82fe35e3.

LGTM, I've pushed it to emacs-29.  Thanks!

> Thanks!
>
> Joseph