bug#21462: 25.0.50; Gnus thread gathering and sorting inverted

[Lars Ingebrigtsen]

Michael Welsh Duggan <mwd@cert.org> writes:

>>> 1) gnus-make-threads -> gathers articles into threads by ref
>>> 2) gnus-cut-threads  -> removes "uninteresting" articles from the
>>>    threads
>>> 3) gnus-sort-threads -> sorts the threads (with respect to each other 
>>> thread)
>>> 4) gnus-summary-thread-gathering-function -> gathers threads with
>>>    similar characteristics (subject, reference) into a single thread
>>> 5) gnus-sort-gathered-threads -> sorts the articles within each thread

[...]

> Is there a good reason for step 3 and 4 above to be in the given order
> instead of the reverse?

I think the reason they are in that order is for historical (and
backwards compatible) reasons: The predicates that work on thread
sorting will normally fail on gathered threads (which are lists of
thread roots).  I think.

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