[kmail2] [Bug 320041] New: On moving or deleting a mail in a folder messagelist sometimes is displayed empty although other mails are in that folder

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=320041

            Bug ID: 320041
           Summary: On moving or deleting a mail in a folder messagelist
                    sometimes is displayed empty although other mails are
                    in that folder
    Classification: Unclassified
           Product: kmail2
           Version: 4.10.2
          Platform: Debian unstable
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: Martin at Lichtvoll.de

For the moment due to to automatic filtering being broken for me (see bug
#319289, bug #319238 and most importantly #319226), I use a subfolder called
"_Posteingang" ("_inbox" in english) to download all new mails via POP3. Then I
weed out spam, mark all mails and press Ctrl+J, and then move the remaining
ones manually. On moving or deleting a mail KMail sometimes empties the whole
message list of the folder. Selecting another folder and then going back to the
custom inbox folder makes messages appear in message list again.

Reproducible: Sometimes

Steps to Reproduce:
1. Have a POP3 account and have it download mails to "_Posteingang" folder
within your POP3 folder structure for it. I.e. if all folders of your POP3
account are in folder "Lichtvoll", let POP3 account download to
"Lichtvoll/_Posteingang"
2. Go into "_Posteingang"
3. Move some mails manually into folder "Lichtvoll" (i.e. my regular inbox
folder, for times when filtering workarounds are no longer necessary)
4. Or - but happens more rarely - have a Ctrl+J triggered filter move a mail or
delete a mail manually.
Actual Results:  
KMail displayes folder "_Posteingang" as empty, even though it still contains
mails.

Selecting another folder and going back to "_Posteingang" then usually makes
all mail appear again. AFAIR sometimes I had to restart KMail, but I am not
sure about that.

Expected Results:  
KMail displayes folder "_Posteingang"´s contents without the mails just having
been moved or deleted.

KDEPIM 4.10.2 (plus a24942ac27c27a4a540148292a9e6fbee1c8fff7 for fixing address
completion in Akonadi), MySQL 5.5 and Akonadi 1.9.2.

This is a display bug. As far as I noticed all mails are still there.

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