gnus-summary-refer-parent-article weirdness

[prj@po.cwru.edu (Paul Jarc)]

I'm running current CVS oGnus, and getting some hard-to-pin-down
errors with gnus-summary-refer-parent-article.  When I try to get the
parent of an article, I sometimes get one of a variety of errors if
the parent is not already visible in the Summary buffer, but the
parent's parent is.  Sometimes the grandparent's Summary line gets
duplicated; sometimes the parent is inaccessible.  I can reproduce the
same error consistently in any case where it happens, but I can't
figure out what makes those cases different from cases where no error
occurs.

Example: <URL:http://multivac.cwru.edu/prj/log.tar.gz> is a maildir
with 3 messages, each a reply to the last.  If the first and third are
'ticked (thus visible) and the second is 'read (thus not initially
visible), I get an error if I '^' on the third article.  'C-u RET' to
enter the group shows the correct thread structure.

Some of my Gnus-related configuration stuff can be found at
<URL:http://multivac.cwru.edu/prj/gnus>.  This is all from my .emacs;
I have no .gnus.

" *nntpd*" seems to contain correct data the whole time, so I don't
think this is a backend problem, but in case it is, you can get
nnmaildir from <URL:http://multivac.cwru.edu/nnmaildir/>.

This problem, or one like it, existed at least as far back as 5.8.7,
although for the particular instance where I found and could reproduce
the error in 5.8.7, oGnus did not exhibit the error.  I think 5.8.8
also fixed that particular case.


paul