bug#70994: [PATCH] Make cache regeneration work in group names with /

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

Eric Abrahamsen wrote:

> Stefan Kangas <stefankangas@gmail.com> writes:
>
>> James Thomas via "Bug reports for GNU Emacs, the Swiss army knife of
>> text editors" <bug-gnu-emacs@gnu.org> writes:
>>
>>> Reproduction steps for bug:
>>>
>>> - emacs -Q
>>> - (setq gnus-secondary-select-methods
>>>     '((nnatom "github.com/vedang/pdf-tools/commits.atom")))
>>>   (setq gnus-select-method '(nnnil ""))
>>> - M-x gnus
>>> - Open a message in the new group and press *
>>> - Add the cache virtual server (info "(gnus) Creating a Virtual Server")
>>> - ^ (server buffer) and: g on the cache
>>> - RET to open (fails)
>>>
>>> This is a possible fix that I've tested only on my (limited) setup, for
>>> now:
>>
>> Eric, what do you think of the below patch?
>
> Thanks for the bump...
>
> James, wasn't this what bug#69517 was supposed to be fixing?

You're right, but that was specifically the 'cache'. In regenerate, all
it sees is that the backend is nnml and there's nothing else special
about the server.

> I'm still feeling like we're patching pinhole leaks in a fundamentally
> broken system.

Sorry if my patch made you think so, but I don't feel that way 🙂. This
feature is just tangential and things like slashes in group names are
bound to complicate things.

But let me see if I can whip up an alternative patch that does things in
a simpler way (I did say: 'possible' patch). One thing to decide is
whether '%'s are uncommon enough in group names to warrant special
treatment in a backend as fundamental as nnml.

Regards,
James