[kmail2] [Bug 331891] New: Broken references-chain (email header) leads to new Thread

[Bernhard]

https://bugs.kde.org/show_bug.cgi?id=331891

            Bug ID: 331891
           Summary: Broken references-chain (email header) leads to new
                    Thread
    Classification: Unclassified
           Product: kmail2
           Version: 4.12.2
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: b.d.s.e at gmx.de

Asume we have two emails with the following headers:
header 1:
Message-ID: <first at host>

header 2:
Message-ID: <third at host>
In-Reply-To: <second at host>
References: <first at host> <second at host>

Now shouldn't these two emails be in the same thread regardless where the email
with the Message-ID <second at host> is (especially if <second at host> isn't
present)?

Reproducible: Always

Steps to Reproduce:
1. Send an email to yourself
2. Reply to that email
3. Reply to the reply
3. Delete the second email
Actual Results:  
Now the first and third email are in separate threads.

Expected Results:  
The first and third email should still be in the same thread.

You have to enable threads in your messages list:
View -> Message List -> Aggregation -> Default Message List

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