A T only finds old articles in current thread

[Matt McClure <matthew.mcclure.es.99@aya.yale.edu>]

The documentation for gnus-summary-refer-thread says:

  A T runs the command gnus-summary-refer-thread
     which is an interactive compiled Lisp function in `gnus-sum'.
  (gnus-summary-refer-thread &optional LIMIT)

  Fetch all articles in the current thread.
  If LIMIT (the numerical prefix), fetch that many old headers instead
  of what's specified by the `gnus-refer-thread-limit' variable.

But it appears to find only old articles in the current thread.  For
example, suppose I have ticked an article, I subsequently read a follow-up
to it, exit the group, then re-enter later.  The ticked article will
show in the summary, but not the follow-up.  I would expect A T to find
the whole thread, including the follow-up to the ticked article, but it
only finds older articles.

Is there any way to find the _entire_ thread?

Thanks,
Matt

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