[kmail2] [Bug 417242] New: Message is rendered as unread even when read

[Juraj]

https://bugs.kde.org/show_bug.cgi?id=417242

            Bug ID: 417242
           Summary: Message is rendered as unread even when read
           Product: kmail2
           Version: 5.13.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: sgd.orava at gmail.com
  Target Milestone: ---

Created attachment 125719
  --> https://bugs.kde.org/attachment.cgi?id=125719&action=edit
Message list

SUMMARY
Messages are sometimes always rendered as unread (even context menu show thinks
they are unread since it offers option to mark them as READ, which has no
effects) even when read and the count for unread messages beside the folder is
0 (not displayed)

STEPS TO REPRODUCE
Honestly no idea, it just happens.
I have set message view as:
Message List > Theme : Classic
Message List > Aggregation : Current Activity, threaded
I think the bug shows when the message is a reply to some other mail.

OBSERVED RESULT
Message rendered as unread when not counted as unread, while being unable to
mark it as read. (The option is in context menu but has no effect)

EXPECTED RESULT
Message is properly rendered & marked as read.

SOFTWARE/OS VERSIONS
Operating System: Artix Linux 
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.66.0
Qt Version: 5.14.1
Kernel Version: 4.19.98-1-lts
OS Type: 64-bit

ADDITIONAL INFORMATION
Sometimes I use Android K-9 Mail to browse my mails when KMail is not active,
than I mark the mails back as UNREAD for KMail to run filters on them as on new
messages e.g. move them to different folders.

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