bug#48341: 28.0.50; naming nnselect group fails on exit

[Eric Abrahamsen]

"Jose A. Ortega Ruiz" <mail@jao.io> writes:

> - Use a Gnus configuration where the name of the server is not show in
>   the Groups buffer. E.g., i use:
>       (setq gnus-group-line-format " %m%S%p%3y%P%* %~(pad-right 45)G %B\n")
>   and, if, for instance, a group is named "nnselect:foo", its name in
>   the groups buffer is just "foo".
> - Perform any search in the Groups buffer with G G
> - After entering the results group, name it with C-c C-p
> - Try exiting the group. One gets an error:
>     Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>      string-match("^[^:]+:" nil)
>      gnus-activate-group(nil)
>      gnus-list-of-unread-articles(nil)
>      nnselect-push-info("nnselect:nnselect-87im3qujhz.fsf")
>      nnselect-close-group("nnselect-87im3qujhz.fsf" "")
>      gnus-close-group("nnselect:nnselect-87im3qujhz.fsf")
>      gnus-summary-exit()
>      funcall-interactively(gnus-summary-exit)
>      call-interactively(gnus-summary-exit nil nil)
>      command-execute(gnus-summary-exit)

I wasn't able to reproduce this using your `gnus-group-line-format' and
searching an nnimap server. Can you show the value of
`gnus-newsgroup-selection' right before you do the C-c C-p?

Eric