[kmail2] [Bug 279115] Standard Mailing list doesn't thread properly

[Jonathan Marten]

https://bugs.kde.org/show_bug.cgi?id=279115

--- Comment #6 from Jonathan Marten <jjm at keelhaul.me.uk> ---
Created attachment 80486
  --> https://bugs.kde.org/attachment.cgi?id=80486&action=edit
Zip archive of test messages

Test case attached, public messages with no personal information included. 
These Bugzilla mails are unchanged apart from deleting irrelevant "Received"
headers and removing the "New:" prefix from the thread starters so that the
subjects are identical.

To reproduce:  Create a new empty folder in KMail.

>From within the zip archive, click on each of the files in turn to open them
with KMail View.  Do not do this with the 'thread2-1' message for the moment.

Context menu - Copy Item To - the new folder

The folder should now have five emails in it.  With the aggregation options set
to "Standard Mailing List", observe that the 3 messages referring to bug#314981
are threaded but the 2 messages referring to bug#279188 are not.  Even though
the thread starter is not present, they should be grouped by subject.

Then copy in the 'thread2-1' message.  Observe that the second set of messages
become threaded.

To confirm, delete one of the thread starter messages and observe that the
remaining ones become unthreaded again.

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