[kmail2] [Bug 467607] New: Filtered E-Mails appear twice

[Attila]

https://bugs.kde.org/show_bug.cgi?id=467607

            Bug ID: 467607
           Summary: Filtered E-Mails appear twice
    Classification: Applications
           Product: kmail2
           Version: 5.22.3
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: bugs.kde.attila at online.de
  Target Milestone: ---

SUMMARY

New E-Mails which are filtered appear twice when they moved to the specified
folder.
If I click on the first one, KMail displays the content of the E-Mail
correctly.
If I click on the second one, KMail does not display any content, i.e. I see an
empty E-Mail.

STEPS TO REPRODUCE
1. Launch KMail
2. Add a new Subfolder
3. Set up a rule for the filter
4. Check the new E-Mails in the subfolder

OBSERVED RESULT
Some of the new E-Mails appear twice.

EXPECTED RESULT
New E-Mails which are filtered should appear once.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
Operating System: Fedora Linux 37
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.1.18-200.fc37.x86_64 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4770T CPU @ 2.50GHz

ADDITIONAL INFORMATION
I use POP3 to retrieve E-Mails. The filter is super slow. It takes several
minutes to filter 100 new E-Mails. The rules are very simple. It is advisable
not to use Kmail while the E-Mails are being filtered to avoid errors.

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