[kmail2] [Bug 316521] New: triggerExpunge called on mail folders, loosing many messages that need to be resynced

[Torsten Grote]

https://bugs.kde.org/show_bug.cgi?id=316521

            Bug ID: 316521
           Summary: triggerExpunge called on mail folders, loosing many
                    messages that need to be resynced
    Classification: Unclassified
           Product: kmail2
           Version: Git (master)
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: misc
          Assignee: kdepim-bugs at kde.org
          Reporter: grote at kolabsys.com

Around the time the code that should fix disconnected IMAP was pushed, I
started to see a severe and nasty problem in kmail: Some folders with thousands
of mails 'loose' the latest mails and need to resync them everytime I click on
this folder.

Some people in IRC have the same problem. They said this might be due to mails
with empty body that cause triggerExpunge being called.

I also see a lot of KIMAP::ExpungeJob::handleResponse: Unhandled response:  *
5721 EXISTS but I don't know i this is related.

Reproducible: Always

Steps to Reproduce:
1. Click on an affected folder and see how mail count drops and how new mails
vanish
2. Wait for resync or select the folder again, to see news mails being fetched
from server again

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