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e3ace39
(Get the code!)
Affects heavily KDE/KMail 4.8.4 too...
The problem is definitely in moving messages by an applied filter. Manual filtering doesn't have it.
The affected messages are marked for deletion on the remote server (IMAP in my case), deleted from the KMail folder and then reappearing back in the same Kmail folder and in the remote folder too. So at some point in time, the remote folder has the marked for deletion messages + one fresh new and duplicate of all marked for deletion. The strange thing is that some of the duplicates have only headers and not the full messages.
So the problem seems to be in the Move action function of the filtering rules.