[kmail2] [Bug 392977] Threading from with same subject but different sender shows in wrong thread

[Samuele]

https://bugs.kde.org/show_bug.cgi?id=392977

Samuele <samuele.zappala at mail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |samuele.zappala at mail.com
            Version|5.7.2                       |5.19.3

--- Comment #2 from Samuele <samuele.zappala at mail.com> ---
Same problem here:

SUMMARY
Messages from two different senders get grouped in the same thread because they
have the same subject. As you can see in the attachments, those are two
different people.
Those aren't messages sent to two different people who then replied. Simply,
the subject of the email was the same.


STEPS TO REPRODUCE
1. Send two emails with the same subject
2. Receive an answer for each message sent. The received messages will have
"RE: subject" as subject.

OBSERVED RESULT
They are grouped together in the same thread.

EXPECTED RESULT
They should have a different thread each.

SOFTWARE/OS VERSIONS 
Linux/KDE Plasma:  KDE Neon
(available in About System)
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

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