[kmail2] [Bug 332026] New: Kmail mixes up IMAP folders, causing huge data loss due to misplaced expiry dates

[Gauss]

https://bugs.kde.org/show_bug.cgi?id=332026

            Bug ID: 332026
           Summary: Kmail mixes up IMAP folders, causing huge data loss
                    due to misplaced expiry dates
    Classification: Unclassified
           Product: kmail2
           Version: 4.12.3
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: third-impact at gmx.de

Hello kmail team,
after using kmail till ~4.9 I switched to Thunderbird due to some annoying
bugs. I wanted to give the new 4.12.3 version a chance, so I started up kmail
and connected my IMAP account, because I had deleted the account from Akonadi
when I switched to Thunderbird. Although I have deleted it, some of my settings
were still present like filters, expiry dates etc. which shouldn't be a bad
thing in the first place.

The problem is, that although none of the IMAP folder names have changed, kmail
mixed up the folders, e.g. a filter which should move new mails like Logfiles
to Administration/Logfiles it moved them to ProjectXY/ImportantStuff . The real
problem is, that the same thing happened for the expiry dates. The folder
Administration/Logfiles had an expiry date of 30 days, the folder
ProjectXY/ImportantStuff had none. As the two folders were internally swapped
all old mails in ProjectXY/ImportantStuff got deleted.
This did not just happen to two folders but kmail rampaged through my whole
IMAP account. When I noticed it was already too late.

I haven't tried to reproduce this and will not try, but I suspect kmail is
storing the info for the folders not by the folder name but maybe by some
Akonadi ID (?),  and the ordering of those IDs was changed when I readded the
account.
I think this is a highly critical and dangerous bug. While not appearing for
everyday use it can cause tremendous data loss.

Reproducible: Didn't try

Actual Results:  
Filters move files to wrong directories, expiry dates are applied on the wrong
directories causing data loss.

Expected Results:  
Either filters / expiry dates should be removed when the IMAP account is
removed or a method should be implemented to ensure a correct association of
the filters to the IMAP directories, once the account is readded (e.g. a simple
identification by name would do the trick).

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