Thanks for cleaning this up, Eric.  Could someone please look into the
following byte-compilation warning?

  In spam-setup-widening:
  gnus/spam.el:1234:11: Warning: ‘nnimap-split-download-body-default’ is an
      obsolete variable (as of 28.1); use ‘nnimap-split-download-body’ instead.

I was thinking of the following change: