[Bug 307064] New: Mail folders "synchronized" once again every time it is opened

[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=307064

            Bug ID: 307064
          Severity: normal
           Version: 4.9.1
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: Mail folders "synchronized" once again every time it
                    is opened
    Classification: Unclassified
                OS: Linux
          Reporter: marcel.wiesweg at gmx.de
          Hardware: Other
            Status: NEW
         Component: general
           Product: kmail2

Fresh conversion from KMail1, local mail folder, folders have 20k-50k images.
Opening a folder for reading mails:
1) Message titles are loaded in the message list view, count is visible in the
status line in the lower left corner. Takes about 1-2 secs/10k mails on my
machine. Slightly slower than KMail1, but acceptable.
All messages are visible, grouped/threaded.
2) Now comes a second step, and this is my complaint: A task opens (right lower
corner) "Folder is synchronized" (translated back from German translation).
While this task is active, mails cannot be read: "The contents of this folder
are being fetched" (backtranslation again). The mixedmaildir agent eats one CPU
core. Sometimes, this synchronization takes only a few seconds, sometimes, it
takes 10-20 secs. Note: This happens every time I switch between folders in
KMail, again and again.


Reproducible: Always

Steps to Reproduce:
1. Take a larger local mail setup
2. Have two or three folder >10k mails
3. Switch between them
Actual Results:  
After loading the message titles, a synchronisation blocks reading mails

Expected Results:  
Reading mails is possible immediately

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