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(gnus)More Threading

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More Threading
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`gnus-show-threads'
     If this variable is `nil', no threading will be done, and all of
     the rest of the variables here will have no effect.  Turning
     threading off will speed group selection up a bit, but it is sure
     to make reading slower and more awkward.

`gnus-thread-hide-subtree'
     If non-`nil', all threads will be hidden when the summary buffer is
     generated.

`gnus-thread-expunge-below'
     All threads that have a total score (as defined by
     `gnus-thread-score-function') less than this number will be
     expunged.  This variable is `nil' by default, which means that no
     threads are expunged.

`gnus-thread-hide-killed'
     if you kill a thread and this variable is non-`nil', the subtree
     will be hidden.

`gnus-thread-ignore-subject'
     Sometimes somebody changes the subject in the middle of a thread.
     If this variable is non-`nil', the subject change is ignored.  If
     it is `nil', which is the default, a change in the subject will
     result in a new thread.

`gnus-thread-indent-level'
     This is a number that says how much each sub-thread should be
     indented.  The default is 4.

`gnus-sort-gathered-threads-function'
     Sometimes, particularly with mailing lists, the order in which
     mails arrive locally is not necessarily the same as the order in
     which they arrived on the mailing list.  Consequently, when
     sorting sub-threads using the default
     `gnus-thread-sort-by-number', responses can end up appearing
     before the article to which they are responding to.  Setting this
     variable to an alternate value (e.g. `gnus-thread-sort-by-date'),
     in a group's parameters or in an appropriate hook (e.g.
     `gnus-summary-generate-hook') can produce a more logical
     sub-thread ordering in such instances.