[kmail2] [Bug 453383] New: Reply mails are shown in wrong thread after being moved to a different folder (in Kontact)

[Frank Steinmetzger]

https://bugs.kde.org/show_bug.cgi?id=453383

            Bug ID: 453383
           Summary: Reply mails are shown in wrong thread after being
                    moved to a different folder (in Kontact)
           Product: kmail2
           Version: 5.20.0
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: folders
          Assignee: kdepim-bugs at kde.org
          Reporter: dev-kde at felsenfleischer.de
  Target Milestone: ---

Created attachment 148558
  --> https://bugs.kde.org/attachment.cgi?id=148558&action=edit
Comparison of inbox view between Kontact and Kmail

I’ve been observing this issue now for a very long time now. I thought
something this obvious must be noticed easily. But it seems I hit a niche and
it just happened again, so I finally decided to report it.

STEPS TO REPRODUCE
I just sent replies to two different mail threads in an IMAP account. KMail
stored the replies in the Sent folder, as usual. I went to the folder, selected
both mails and moved them to the Inbox folder, so they may be shown within
their respective threads.

OBSERVED RESULT
The mails were shown in the wrong thread: replay to thread A is shown in thread
B and vice versa.

EXPECTED RESULT
The mails should appear as reply to the correct mail.

Operating System: Arch Linux
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
Kernel Version: 5.17.5-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-5200U CPU @ 2.20GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 5500


ADDITIONAL INFORMATION
One very interesting bit of info that I found out just now: the issue only
appears in Kontakt. I closed Kontact and opened KMail as standalone
application, and in there the threads were correct. Then I closed KMail and
reopened Kontact, and the mails were mixed up again. I did this twice, both
times with the same result. So perhaps this is a Kontact thing, or an Akonadi
bug? I haven’t tested yet what happens if I move mail in standalone-KMail, so
whether the (akonadi?) data is garbled during the move or during display.

I also looked at the mail source to make sure the In-Reply-To header was
correct. But I already knew it was so, because when I sync the account with
offlineimap and view it in mutt, the thread is also correct. I have
akonadiconsole installed, so I am happy to provide deeper info if required.

While preparing the screenshots, I also noticed that the structure of the lower
thread is different between the two programs (see circles in the image).
Apparently there has been a similar hickup in the thread before.

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