[kmail2] [Bug 371509] New: reading every new message resynchronizes folder

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=371509

            Bug ID: 371509
           Summary: reading every new message resynchronizes folder
           Product: kmail2
           Version: 5.1.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: folders
          Assignee: kdepim-bugs at kde.org
          Reporter: phma at bezitopo.org

I click on an unread message in the message list. Kmail resynchronizes the
folder. I'm on a high-latency (satellite) connection and have a lot of email,
so this takes about three minutes. During this time, I cannot read any other
message.

This did not happen before upgrading to Xenial; the version in Trusty is
4.13.3.

Reproducible: Always

Steps to Reproduce:
1. Click on an unread message.
2. "Retrieving Folder Contents" appears, followed shortly by the message.
3. A progress bar appears at the bottom: "Syncing folder 'Inbox'"
4. Click on any other unread message.
5. "Retrieving Folder Contents" appears in the message window and stays there
until it finishes synchronizing the folder.

Actual Results:  
After the second unread message appears, Kmail resynchronizes the folder again.
If I click on another message, it puts off showing it until it finishes syncing
the folder. This means I cannot read more that one new message every three
minutes.

Expected Results:  
It should show the message immediately. There is no need to resynchronize
folders unless some other app is accessing the same IMAP server, which it
isn't.

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