[kmail2] [Bug 359698] Wastebin does not get emptied when config set to empty on exit

[RJVB via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=359698

--- Comment #4 from RJVB <rjvbertin at gmail.com> ---
The venom appears to be here

Thread 1 (Thread 0x7f751218b940 (LWP 26483)):
[KCrash Handler]
#6  QListData::size (this=0x10) at /usr/include/qt5/QtCore/qlist.h:105
#7  QList<KMail::UndoInfo*>::count (this=0x10) at
/usr/include/qt5/QtCore/qlist.h:314
#8  KMail::UndoStack::size (this=0x0) at
/usr/src/debug/kdepim-15.12.2/kmail/undostack.cpp:58
#9  0x00007f7511a1247c in KMMainWidget::updateMessageActionsDelayed
(this=this at entry=0xddef60) at
/usr/src/debug/kdepim-15.12.2/kmail/kmmainwidget.cpp:3850
#10 0x00007f7511a12d23 in KMMainWidget::updateMessageActions
(this=this at entry=0xddef60, fast=fast at entry=false) at
/usr/src/debug/kdepim-15.12.2/kmail/kmmainwidget.cpp:3682
#11 0x00007f7511a23331 in KMMainWidget::setupActions (this=this at entry=0xddef60)
at /usr/src/debug/kdepim-15.12.2/kmail/kmmainwidget.cpp:3423
#12 0x00007f7511a277db in KMMainWidget::KMMainWidget (this=0xddef60,
parent=<optimized out>, aGUIClient=0xea9ec0, actionCollection=0xce4930,
config=...) at /usr/src/debug/kdepim-15.12.2/kmail/kmmainwidget.cpp:256
#13 0x00007f75119d56d2 in KMMainWin::KMMainWin (this=0xea9e50,
__in_chrg=<optimized out>, __vtt_parm=<optimized out>) at
/usr/src/debug/kdepim-15.12.2/kmail/kmmainwin.cpp:61
#14 0x00007f75119e6237 in KMKernel::openReader (this=this at entry=0x7ffec338fcc0,
onlyCheck=onlyCheck at entry=false) at
/usr/src/debug/kdepim-15.12.2/kmail/kmkernel.cpp:522

That looks like an attempt to determine the size of a non-existing undo stack
-- maybe KMail detects the presence of messages in the wastebin and presumes
this must mean that an undo stack has been created?

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