[Bug 290353] New: kmail loses emails during recursive refresh

[Bruno Haible]

https://bugs.kde.org/show_bug.cgi?id=290353

           Summary: kmail loses emails during recursive refresh
           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

In kmail 4.7.4. Using a old kmail-formatted maildir (mixedmaildir).

In the folders tree, I selected a folder with many subfolders and pressed
Ctrl-F5 (recursive refresh). There was no visible sign of progress (probably
because the medium is a slow USB 1.1 disk). I pressed Ctrl-F5 (recursive
refresh)
again. Then, after a long processing time, I found that in some (few) folders
some mails have been removed (compared to a backup a made just before the
operation).


Reproducible: Didn't try

Steps to Reproduce:
Press Ctrl-F5 two or more times on a folder (in a mixedmaildir resource)
with many subfolders.

Actual Results:  
Some of the mailbox files are modified: some mails are simply deleted.
In some case it were 1-3 mails at the end of the mailbox file; in other cases
apparently random mails inside the mailbox file.


Expected Results:  
None of the mailbox files (.mbox format) gets modified by the operation.

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