[kmail2] [Bug 341746] New: Deleting a search folder puts kontact/kmail2 in dire state and finally crashes the Application

[Rigo Wenning]

https://bugs.kde.org/show_bug.cgi?id=341746

            Bug ID: 341746
           Summary: Deleting a search folder puts kontact/kmail2 in dire
                    state and finally crashes the Application
           Product: kmail2
           Version: Git (master)
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: search
          Assignee: kdepim-bugs at kde.org
          Reporter: rigo at w3.org
                CC: me at vhanda.in

Deleting virtual folders makes the imap- folder list disappear for at least 5
minutes without optical feedback that kmail2 is working. Once the folder list
comes back, kmail2 is in a dire state and will ultimately crash with 100% on
one of the cores. 

Reproducible: Always

Steps to Reproduce:
To reproduce: 
1. Start a search in your imap - account in some folder (or all). 
2. Accept to create a virtual folder (last-search). 
3. Search (completes without problems)
4. After the search, look at some messages. 
5. Then delete this virtual folder (last search)

Actual Results:  
Now the imap - account disappears from the folder-list (left) and eventually
re-appears after 5-6 minutes (seems to depend on how large the imap account
is). No feedback on processing is given. Now kmail2 is in a dire state. Some
new arbitrary folder appears in the favorites. After some time, kmail2 starts
using 100% of one core. 

Expected Results:  
The virtual folder is deleted without re-processing everything and kmail
remains in a stable state. 

Luc Montel confirmed the behaviour and said it has to do with the ETM

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