[Bug 290363] Moved folders disappear

[Wonko]

https://bugs.kde.org/show_bug.cgi?id=290363

Wonko <wonko at wonkology.org> changed:

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                 CC|                            |wonko at wonkology.org

--- Comment #2 from Wonko <wonko at wonkology.org> ---
This looks like it could be the bug I just encountered. What I did was:

- Rename IMAP folder 'Archives/2010' to 'Archives/Gentoo-User-2010', using
Claws Mail
- Wait until KMail shows this folder with its new name. Got some Akonadi errors
meanwhile, but I'm getting used to it
- Move this folder to 'Local Folders/Backup/', a local maildir resource.

After a while, I got LOTS!! of notifications:
- Local Folders: Error: Not supported type (this one for dozends of times).
- Virtyou: Connection aborted
- Virtyou: There is no connection to the IMAP server
- Local Folders: Item query returned empty result

Kmail crashed then. After restart, the Archives/Gentoo-User-2010 folder is
gone. But 'Local Folders/Backup' is still empty. So, it seems that KMail just
ate a whole folder containing 12,000 mails. I confirmed by looking into
.local/share/.local-mail.directory/.Backup.directory/, there is nothing besides
the cur, new and tmp directories. When I drag single mails into this folder,
they do show up both in KMail and in the directory.

This is reproducable, I tried this three more times, also using a different
IMAP server:
- create a sub-folder on the IMAP server (it seems KMail does not allow to
create top-level folders)
- copy some mails into it
- move this folder anywhere to the local mail directory
- the folder appears, and also the mails in it - but they disappear after a
second
- I cannot find those mails in the file system, it seems they are simply gone

This is SCARY! And I assume this does not happen for everyone, and there is
something  strange in our setups. But I wonder why there are no comments yet,
not even someone saying the same does not happen for him, or asking for more
details in order to reproduce. This is about data being lost! In my case it's
not important, just an archived mailing list, and I even have a backup, but
this can be really bad for other people.

I'm using KDE 4.8.1 on Gentoo Linux.

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