[kmail2] [Bug 388151] New: Moving messages to other folder corrupts threading

[Alex Hermann]

https://bugs.kde.org/show_bug.cgi?id=388151

            Bug ID: 388151
           Summary: Moving messages to other folder corrupts threading
           Product: kmail2
           Version: 5.6.0
          Platform: Debian unstable
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: gaaf at gmx.net
  Target Milestone: ---

When using threading strategy "Perfect and by references", moved messages are
threaded randomly in the tree under the thread starter. In the same folder, the
direct parent (from In-Reply-To) is also present, but the message not threaded
under it.

The resulting folder structure is a complete mess. Restarting kmail and/or
akonadi doesn't help.

Changing to threading startegy "Perfect only" shows the correct tree, but
obviously creates separate trees when a message is missing. Switching back to
"Perfect and by references" seems to fix the threading.

I have not noticed any problems with threading of new incoming emails, only
when moving messages between folders. The messages are moved within the same
account, which uses online imap as its backend.


The message list aggregation is set to "Threaded" with the following config:

Grouping: none
Group expand policy: -
Threading: perfect and by references
Thread leader: Topmost message
Thread expand policy: Expand threads with unread or important messages

Fill view strategy: Favor interactivity

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