[kmail2] [Bug 369677] New: "Remove Duplicate Messages" gives throws blank error dialog

[Tristan Miller via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=369677

            Bug ID: 369677
           Summary: "Remove Duplicate Messages" gives throws blank error
                    dialog
           Product: kmail2
           Version: 5.3.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: folders
          Assignee: kdepim-bugs at kde.org
          Reporter: psychonaut at nothingisreal.com

I'm suffering from one (I'm not sure which) of the many bugs in KMail2 that
results in new messages getting duplicated en masse.  To remove these, I use
the "Remove Duplicate Messages" command from the "Folder" menu.  While this
command does seem to work, it has a number of undesirable side-effects.  Here
is what happens when I run the command:

1. A progress bar–like throbber appears in the status bar. 

2. After several seconds (or minutes, for particularly large folders), a
completely blank message dialog appears.  It has a big red icon on it so I
assume it's a serious error (though maybe it's just supposed to be telling me
how many duplicates have been removed?).  See attached screenshot.

3. After pressing OK on the error dialog, I am returned to the main KMail
window.

4. Nothing happens for about five seconds.  Then, the throbber finally stops
and the duplicated messages disappear from the message list.


Reproducible: Always

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