[Bug 290422] New: lost many email while moving them from a local folder to a local folder

[Bruno Haible]

https://bugs.kde.org/show_bug.cgi?id=290422

           Summary: lost many email while moving them from a local folder
                    to a local folder
           Product: kontact
           Version: 4.7.2
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: mail
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: bruno at clisp.org


Version:           4.7.2 (using KDE 4.7.3) 
OS:                Linux

kmail 4.7.4, akonadi 4.7.4

I moved the entire contents of a local folder (mbox format, in a mixedmaildir
resource,
from a previous kmail installation) to another local folder (maildir format,
in the default maildir resource created by kmail).
This process copied 2/3 of the mails correctly, but lost 1/3 of the mails:
All mails newer than a certain date gave rise to 1-byte files (contents: 0x0A)
for each in the destination folder. This is likely to be the consequence of an
error. BUT the mails were all removed from the original folder!


Reproducible: Didn't try

Steps to Reproduce:
Register a mixedmaildir resource for an old kmail dir with 1 GB of mails.
Press Ctrl-F5 (recursive refresh) on the top-level directory.
It takes a long time and makes the akonadi_mixedmaildir_resource process grow
to more than 2 GB.
Select 1000 mails in one of these mail folders. Move them to your inbox using
drag-and-drop.


Actual Results:  
Mails were deleted from the original folder even if they did not appear
correctly
in the destination folder.

Expected Results:  
Mails that could not be copied should stay in the original folder.

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