[Bug 281704] New: Mails were deleted after moving folder

[Jonathan]

https://bugs.kde.org/show_bug.cgi?id=281704

           Summary: Mails were deleted after moving folder
           Product: kmail2
           Version: 4.7
          Platform: Archlinux Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: jonathan.schluessler at gmx.de


Version:           4.7 (using KDE 4.7.0) 
OS:                Linux

I moved the Inbox of IMAP account A to IMAP account B by accident. The Inbox
contained about 100 mails. When I realized that I've dragged the wrong folder I
immediately moved it back - approx. 5 seconds between the to moves via
drag&drop.
I checked the mails back on the IMAP account A and everything looked alright.
Then some time later I restarted kmail and akonadi (which I have to do a couple
of times a day because of bug #260647). After the restart all mails in the
Inbox of IMAP account A (the one which was moved back and forth) were gone.

Fortunately I could call the expensive service hotline and get all mails
restored.

Reproducible: Sometimes

Steps to Reproduce:
I tried to reproduce it a couple of times and sometimes I had the same
behaviour, sometimes everything was correctly moved back and forth. There seems
to be several reasons why it didn't work:
*) The reason for the original failed behaviour might have been that the Inbox
folder was too large (I'd guess it were approx 100 mails = 100mb as I had some
bigger mails in there)
*) I could always reproduce it with moving the folder to a specific IMAP
account C (one which wasn't involved in the original operation). Maybe this
IMAP server does not support some required operations.
*) Once when trying to reproduce the steps kmail crashed. Unfortunately I
didn't note down if this resulted in deleted mails or not, so I can't say it
for sure, but I think this crash ended in a data loss.
*) I got a "There have been repeated failed attempts to gain access to a
wallet. An application may be misbehaving." error from KDE Wallet while trying
to reproduce the misbehaviour. So kmail was offline but still let me move the
folder which ended up in the folder being nowhere after a restart.


Actual Results:  
All mails in the moved folder were deleted after restart.

Expected Results:  
Obviously the mails should be never disappear without further notice.

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