Threading questions

I just ran into a couple of threads that don't seem properly displayed in slrn.
If you look at the Message-ID and References in Case 1 below, you'll see that
the two posts have the same title, but belong in different threads.  Case 2 has
three unrelated articles with the same subject that are displayed as threaded

I'm seeing this in Mode 5 - Thread then sort by scores, and Mode 7 - Thread
then sort by scores and subject on pre-69 with new_subject_breaks_threads set
to 0

Shouldn't I see unrelated posts (i.e. not referenced) with the same title in
different threads in the header display?  In other words, what I'm saying is
that the subject field should have less weight than the message ID and
references, not more.

/rudy


--------
 Case 1
--------
This is from the header display, which is misleading as the second article is
not a child of the first:

       - btorvik2           18+-- Re: Elsewhere in history...
  100  - Miss Elaine Eos     3 +- >

The first article has the following relevant headers:

  From: "btorvik2" <[email protected]>
  Subject: Re: Elsewhere in history...
  Date: Mon, 26 Nov 2007 11:16:57 -0600
  Message-ID: <[email protected]>
  References: <[email protected]>

The second has the following relevant headers:

  From: Miss Elaine Eos <[email protected]>
  Subject: Elsewhere in history...
  Date: Mon, 26 Nov 2007 07:57:38 -0800
  Message-ID: <[email protected]>

--------
 Case 2
--------
This is from the header display, which is misleading as the three articles are
unrelated:

   100  - Miss Elaine Eos      53+-- Smoke two...
   100  - Miss Elaine Eos      52 +- >
   100  - Miss Elaine Eos      37 +- >

The first article has the following relevant headers:

  From: Miss Elaine Eos <[email protected]>
    Subject: Smoke two...
    Message-ID: <[email protected]>
    Date: Sat, 01 Dec 2007 06:43:42 -0800

The second article has the following relevant headers:

  From: Miss Elaine Eos <[email protected]>
    Subject: Smoke two...
    Message-ID: <[email protected]>
    Date: Sun, 02 Dec 2007 08:10:14 -0800

The third article has the following relevant headers:

  From: Miss Elaine Eos <[email protected]>
    Subject: Smoke two...
    Message-ID: <[email protected]>
    Date: Thu, 29 Nov 2007 06:57:16 -0800

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