[kmail2] [Bug 409344] New: KMail crashes when closing a message opened twice or more

[SasQ]

https://bugs.kde.org/show_bug.cgi?id=409344

            Bug ID: 409344
           Summary: KMail crashes when closing a message opened twice or
                    more
           Product: kmail2
           Version: 5.9.3
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: sasq at poczta.ox.pl
  Target Milestone: ---

SUMMARY
The entire program crashes when I open the same message more than once (by
double-clicking on in in the inbox).
I discovered this by accidentally opening more than one instance of the same
message because my mouse is broken and sometimes it gets "autofire" :J

STEPS TO REPRODUCE
1. Double-click on a message in the inbox to open it.
2. Open the same message again in the same way.
3. Close one of those editor windows.

OBSERVED RESULT
The entire program crashes.
I can reproduce it every time.

EXPECTED RESULT
No crash, obviously :q

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Gentoo Linux 4.14.65-gentoo
KDE Plasma Version: kde-frameworks/plasma-5.54.0:5/5.54::gentoo
KDE Frameworks Version: No clue. Where can I find it?
Qt Version: dev-qt/qtcore-5.11.3-r2:5/5.11::gentoo

ADDITIONAL INFORMATION

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