Just for info, I did get a response to my message to JWZ.  I'll forward it later, but I think he agrees that it should be reasonable to not try to thread messages which don't use the Response headers properly (or at all, actually).  Unfortunately, I think there are enough still used mail readers that do this (not using Response) as witnessed by many mailing list responses that lose threading in Pan, which I am assuming is threading without just using Subject:.

I still need to work through the JWZ algorithm in detail to see if there are other options, as he did point out this problem shows up in the fallback stuff when there are no References.


On 08/05/2018 12:11 PM, Pawel Salek via balsa-list wrote:
I think this idea to sort threads by the date of the most recent message contributing to the thread is a very useful one, quite a logical one too.
/Pawel

On Sun, Aug 5, 2018 at 5:35 PM Peter Bloomfield <peterbloomfi...@bellsouth.net <mailto:peterbloomfi...@bellsouth.net>> wrote:

    On 08/01/2018 05:04:29 PM Wed, Jack via balsa-list wrote:
    > Hello all,
    >
    > Too much idle time, perhaps, but I've been musing on mailbox
    sorting.  I mostly use JWZ sorting, with increasing dates.  This
    groups messages per the JWZ algorithm, and then sorts the groups
    by the increasing date of the first message in the group.  If I
    click on the date colulmn header, it simply reverses the order of
    presentation of the groups.   In other words, the ordering within
    groups is not changed, but now the groups are sorted by the
    decreasing date of the first message in the group.
    >
    > I have several mailboxes (mainly various mailing lists) where
    I'd like to maintain the message order within the groups as above,
    but sort the groups by the date of the most recent message in the
    group - either increasing or decreasing.  This would bring the
    most recently active threads to the top or bottom of the list.

    A new GitLab issue[0] has been opened to continue the discussion,
    and a new branch (thread-date) has a modified sort algorithm, with
    threads sorted by the date of the most recent message in the
    thread (its 'thread-date'). Testing and comments welcome!

    Peter

    [0]
    
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