[kmail2] [Bug 376309] New: kmail2 locked on imap mails migration (5.4.2)

[Fabio Coatti]

https://bugs.kde.org/show_bug.cgi?id=376309

            Bug ID: 376309
           Summary: kmail2 locked on imap mails migration (5.4.2)
           Product: kmail2
           Version: 5.4.1
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: fabio.coatti at gmail.com
  Target Milestone: ---

Kmail locks when moving several emails from local folder to remote IMAP server

Scenario:
I have several local folders that I want to move to remote imap folders.
If I move only some messages (say, < 10-20), the operation is completed. Moving
more messages (no exact number though) the process seems to get stuck forever.
The progress bar on sx bottom remains open and nothing happens; even waiting
for hours does not allow the operation to complete. Please note that looking at
the size of messages moved, it would take only some minutes to move them, not
hours. One suspect is that at somepoint the network gets slow (I'm trying in
some location with poor connectivity), the upload gets hogged and kmail is not
able to recover.

I'd rather prefer kmail to throw an error, if really is not able to complete
the operation, that should be the ideal situation :).
In the same network, other mail clients are able to complete a similar
operation. (tested thunderbird/mac, outlook/mac-win)

Distro: gentoo
Kmail: 5.4.2
akonadi 16.12.2
Plasma 5.9.1

Gcc 5.4.0

I can perform tests and give more info, just let me know

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