bug#68317: Can't sort *Packages* buffer by version after installing with package-vc

[Philip Kaludercic]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Mon, 08 Jan 2024 00:59:38 -0800
>> From:  Joseph Turner via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> 
>> To reproduce:
>> 
>> 1. Install some package using package-vc.
>> 
>> 2. Open the *Packages* buffer: M-x list-packages.  The version column
>> for the newly installed package should display a git hash.
>> 
>> 3. Click on the Version column header.  If the package's hash starts with
>> a letter, then instead of sorting the results, Emacs signals an error:
>> 
>> version-to-list: Invalid version syntax: 
>> ‘c99367ebc2f0afe0baaf2f5e5ca1ad9d62ba6e21’ (must start with a number)
>
> Sounds like package-vc-commit should be modified to produce a valid
> version string (which SHA1 is not)?  Philip?

We can also adjust `package-menu--version-predicate' to handle
non-version numbers, which I think would be more robust.