[Bug 300550] Calendar crashed after dragging an event in Week view and lost some data

[L. Rahyen]

https://bugs.kde.org/show_bug.cgi?id=300550

--- Comment #1 from L. Rahyen <research at science.su> ---
Created attachment 71343
  --> https://bugs.kde.org/attachment.cgi?id=71343&action=edit
New crash information added by DrKonqi

kontact (4.4.11) on KDE Platform 4.7.4 (4.7.4) using Qt 4.8.1

- What I was doing when the application crashed:
When I was trying to redo what was lost after previous crash (mostly by
actively dragging events from place to place), Calendar crashed again. Crash
log looks somewhat different, so I'm attaching it too.

Unfortunately, it seems to be hard to reproduce this on purpose - it least
within few minutes of active draging'n'dropping. However, crashes like this
happen annoyingly often during normal usage.

There is a fact I forgot to mention in the previous message. After the crash,
restarting Kontact is not enough. If I just restart it, Calendar will be
unusable: for example, if I try to create an event, it will say "Unable to save
Event" without giving any reason at all. And will not let to drag them either.
Only killall -9 kontact after the crash allows to use Calendar again (killall
kontact is not enough).

-- Backtrace (Reduced):
#6  0x00007fc01884ae78 in vtable for KOAgendaItem () from
/usr/lib/libkorganizerprivate.so.4
#7  0x00007fc03a4c7468 in QWidget::ensurePolished (this=<optimized out>) at
kernel/qwidget.cpp:9693
#8  0x00007fc0352ab7bf in Q3ScrollView::addChild(QWidget*, int, int) () from
/usr/lib/x86_64-linux-gnu/libQt3Support.so.4
#9  0x00007fc018516472 in KOAgenda::placeAgendaItem (this=0x7a70cd0,
item=0x87a4de0, subCellWidth=<optimized out>) at
../../korganizer/views/agendaview/koagenda.cpp:1247
#10 0x00007fc01851a231 in KOAgenda::placeSubCells (this=0x7a70cd0,
placeItem=0x87a4de0) at ../../korganizer/views/agendaview/koagenda.cpp:1294

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