gnus-fetch-old-headers
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If non-nil , Gnus will attempt to build old threads by fetching
more old headers---headers to articles marked as read. If you
would like to display as few summary lines as possible, but still
connect as many loose threads as possible, you should set this variable
to some or a number. If you set it to a number, no more than
that number of extra old headers will be fetched. In either case,
fetching old headers only works if the backend you are using carries
overview files---this would normally be nntp , nnspool and
nnml . Also remember that if the root of the thread has been
expired by the server, there's not much Gnus can do about that.
This variable can also be set to invisible . This won't have any
visible effects, but is useful if you use the A T command a lot
(see Finding the Parent).
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gnus-build-sparse-threads
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Fetching old headers can be slow. A low-rent similar effect can be
gotten by setting this variable to some . Gnus will then look at
the complete References headers of all articles and try to string
together articles that belong in the same thread. This will leave
gaps in the threading display where Gnus guesses that an article
is missing from the thread. (These gaps appear like normal summary
lines. If you select a gap, Gnus will try to fetch the article in
question.) If this variable is t , Gnus will display all these
``gaps'' without regard for whether they are useful for completing the
thread or not. Finally, if this variable is more , Gnus won't cut
off sparse leaf nodes that don't lead anywhere. This variable is
nil by default.
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