[kmail2] [Bug 411954] New: Only ~ half of the messages are deleted

[Fab Stz]

https://bugs.kde.org/show_bug.cgi?id=411954

            Bug ID: 411954
           Summary: Only ~ half of the messages are deleted
           Product: kmail2
           Version: unspecified
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: fabstz-it at yahoo.fr
  Target Milestone: ---

In Kmail2, Debian buster (stable) I try to delete a lot of unread messages from
a folder.
Let's say ~16000. But this is also reproducible with less, like 250 messages,
or 100...

Selecting the messages in the folder (Filter unread + CTRL+A + Shift+Del)
 - Filter unread messages
 - CTRL+A to select all
 - Shift+Del to delete permanently (because it is too long and buggy to move
them to the trash)

Then refresh the view :
 - click on Check Mail 
 - Select the Maildir ressource containing the folder (it is a
mixedmaildir_resource )

About half of the emails have been deleted only and the other hald is still
remaining in the folder as unread.

A new sequence of deletion will delete again only about half of the messages
and so on...

System: Debian Buster (stable)
KMail 5.9.3
PIM/Akonadi 18.08.3

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