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

[Joseph Turner via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Philip Kaludercic <philipk@posteo.net> writes:

> 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