[kmail2] [Bug 381519] New: remove duplicates options do not work

[BingMyBong]

https://bugs.kde.org/show_bug.cgi?id=381519

            Bug ID: 381519
           Summary: remove duplicates options do not work
           Product: kmail2
           Version: 5.5.1
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: folders
          Assignee: kdepim-bugs at kde.org
          Reporter: bingmybong at btinternet.com
  Target Milestone: ---

The two kmail "Remove duplicates" options are very unreliable,  it used to 
work fine. 

when selecting the first "Remove Duplicate Messages" option,  I now always get
2 popup error messages then it stops processing:

Error occurred during removing duplicate emails: 'Unable to fetch item from 
backend (collection 16) : Unable to retrieve item from resource: [LRCONFLICT] 
Resource akonadi_maildir_resource_0 tries to modify item 3253 () (in 
collection 16) with dirty payload, aborting STORE.

Followed by 
Error occurred during removing duplicate emails: 'Unable to fetch item from 
backend (collection 16) : Unable to retrieve item from resource: [LRCONFLICT] 
Resource akonadi_maildir_resource_0 tries to modify item 3253 () (in 
collection 16) with dirty payload, aborting STORE.'

And if i use the 2nd option on Folder menu to remove all from this folder and 
sub folders, it sometimes works and sometimes doesn't even seem to run at all.

One other failing is that no progress bar or indicator is shown.

opensuse:tumbleweed:20170619
Qt: 5.7.1
KDE Frameworks: 5.34.0
KDE Plasma: 5.10.1
kwin 5.10.1
kmail2 5.5.2
akonadiserver 5.5.2
Kernel:  4.11.5-1-default
Nouveau:  1.0.15_1.2

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