[Akonadi] [Bug 316419] New: Filter action "move into folder" sometimes duplicates email

[redcap]

https://bugs.kde.org/show_bug.cgi?id=316419

            Bug ID: 316419
           Summary: Filter action "move into folder" sometimes duplicates
                    email
    Classification: Unclassified
           Product: Akonadi
           Version: 1.9.1
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Mail Filter Agent
          Assignee: kdepim-bugs at kde.org
          Reporter: forenhampel at gmx.de

I have several filter working on incoming mails that move them into specific
folders. I noticed that some emails appear twice in the destination folder.  I
experience this behaviour with roughly 40% of all emails subject to a "move
into folder" filter action. 

I used the akonadi-console to further inspect the duplicated emails. I noticed
that precisely one of the messaged possesses a Remoted ID. Sometimes the
information in the RDF register is also different for such emails. I don't know
if this information is useful. Some more information:

1. I use 4 POP3 mail accounts, no IMAP.
2. From time to time my network is quite slow, due to downloads.
3. AFAICT the issues does not occur on manual filtering

Reproducible: Sometimes

Steps to Reproduce:
1. Set up a filter utilizing the "move into folder" action (e.g. filter mails
on a very active mailing list). Automatically apply filter on incoming mail

Actual Results:  
Some messages are duplicated in the destination folder.

Expected Results:  
Messages shouldn't be duplicated.

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