bug#35219: 27.0.50; Problems with nnimap groups with non-ASCII characters

[Andy Moreton <andrewjmoreton@gmail.com>]

On Thu 18 Apr 2019, Eric Abrahamsen wrote:

> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>
>> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>>
>>> Lars Ingebrigtsen <larsi@gnus.org> writes:
>>>
>>>> This started showing up yesterday after recent changes in Gnus:
>>>>
>>>> To reproduce: Create an nnimap group called "Tést".  Restarting Gnus
>>>> will properly create the group "Tést", but Gnus will also say
>>>>
>>>> nnimap read 12k from quimby.gnus.org (initial sync of 3 groups; please wait)
>>>>
>>>> If you then quit Gnus and restart Gnus, this group will appear:
>>>>
>>>>        *: nnimap+quimby.gnus.org:T\351st
>>>>
>>>> If you try to kill it, all the groups in the buffer will disappear.
>>>>
>>>> So something went wrong during whatever the most recent group-related
>>>> changes were.  :-)
>>>
>>> Gaah... I've got a pile of tests in place for exactly this! Give me a
>>> bit and I'll try to reproduce.
>>
>> Lars, would you give this a shot? I should only have been messing with
>> encoding for group names that were coming from symbols.
>
> This may not be the full solution (though I think it is), but it's
> definitely a necessary part. I'm going to push this first so more people
> don't end up with corrupted .newsrc.eld files, and then see where we're at.

I see a similar symptom, but with a different recipe:
 - start Gnus
 - open the server buffer, select a server, and subscribe to a new group
 - quit the server buffer
 - in the group buffer, kill the group line for the new group
At this point, emacs is busy but unresponsive. Breaking in with ^G
results in emacs becoming responsive agin, but all of the group lines
disappear from the group buffer.

Something is still not quite right.

    AndyM