Respool w/o losing cache info?

[Morgan Fletcher <morgan@hahaha.org>]

Through various mucking with my gnus setup, I've got a couple nnml
groups with summaries that look like this:

  !  [   0:  (nobody)           ] (none)
  !A [   0:  (nobody)           ] (none)
  !  [   0:  (nobody)           ] (none)
  !  [   0:  (nobody)           ] (none)
  !  [  21:  Listserv v4.       ] Welcome to list 'perforce-user'
  !  [  51:  Listserv v4.       ] Usage information

Each of the "zero-line" articles actually contains a valid, > 0 lines
article. I want the summary information corrected, and I don't want to
lose the cached information for each article. Another way of saying
that is I want to keep track of these articles.

I can respool them with `B r`, and then the summary information is
corrected, but the articles become just one among many read articles,
even if I cache them before the respool.

I also tried nnml-generate-nov-databases, but the summary info
remained unchanged.

What's the solution to this problem?

I've seen it on gnus 5.4.63 and pgnus 0.65, on various emacsen.

morgan
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