[Akonadi] [Bug 398783] New: Error message when sending emails, likely linked to failure to add "reply" tag

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https://bugs.kde.org/show_bug.cgi?id=398783

            Bug ID: 398783
           Summary: Error message when sending emails, likely linked to
                    failure to add "reply" tag
           Product: Akonadi
           Version: 5.9.1
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: DAV Resource
          Assignee: kdepim-bugs at kde.org
          Reporter: flyos at mailoo.org
  Target Milestone: ---

In Kmail 5.9.1 (KDE Applications 18.08.1, Akonadi 5.9.1, KF5 5.50, Qt 5.11.1),
I often have the following error message when sending emails:

Impossible d'enregistrer le résultat dans l'élément. [LLCONFLICT] Resource
akonadi_imap_resource_4 tries to modify item 51741 () (in collection 42) with
revision 1; the item was modified elsewhere and has revision 2, aborting STORE. 

(First sentence translates to "Impossible to save the results to the element")

This error results in the email being sent correctly, being correctly saved to
the "Sent" folder, but the tag "Replied To" (or whatever it's called in
English) not being set to the email I replied to.

This doesn't happen to every email, but I fail to find ways to reproduce it. It
seems to happen especially (exclusively?) when the email I reply to is the
first of a thread, but doesn't happen to emails "deeper" in a thread, if that
makes sense.

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