[kontact] [Bug 456742] kontact crashes on start when selected calendars

[Diego Ercolani]

https://bugs.kde.org/show_bug.cgi?id=456742

--- Comment #1 from Diego Ercolani <diego.ercolani at gmail.com> ---
Created attachment 150741
  --> https://bugs.kde.org/attachment.cgi?id=150741&action=edit
New crash information added by DrKonqi

kontact (5.19.3 (21.12.3)) using Qt 5.15.2

- What I was doing when the application crashed:
Selecting "To Do List" from Mail dialog.

Kontac crashes without asking anything

-- Backtrace (Reduced):
#4  QSortFilterProxyModelPrivate::updateChildrenMapping(QModelIndex const&,
QSortFilterProxyModelPrivate::Mapping*, Qt::Orientation, int, int, int, bool)
(this=this at entry=0x55a73add0e90, source_parent=...,
parent_mapping=parent_mapping at entry=0x55a73ac2da80,
orient=orient at entry=Qt::Vertical, start=start at entry=0, end=end at entry=0,
delta_item_count=1, remove=false) at itemmodels/qsortfilterproxymodel.cpp:1200
#5  0x00007f1bf6f918c5 in
QSortFilterProxyModelPrivate::source_items_inserted(QModelIndex const&, int,
int, Qt::Orientation) (this=this at entry=0x55a73add0e90, source_parent=...,
start=start at entry=0, end=end at entry=0, orient=orient at entry=Qt::Vertical) at
itemmodels/qsortfilterproxymodel.cpp:1000
#6  0x00007f1bf6f940ed in
QSortFilterProxyModelPrivate::_q_sourceRowsInserted(QModelIndex const&, int,
int) (this=0x55a73add0e90, source_parent=..., start=0, end=0) at
itemmodels/qsortfilterproxymodel.cpp:1702
#7  0x00007f1bf6f95f81 in QSortFilterProxyModel::qt_static_metacall(QObject*,
QMetaObject::Call, int, void**) (_o=<optimized out>, _c=<optimized out>,
_id=<optimized out>, _a=<optimized out>) at
.moc/moc_qsortfilterproxymodel.cpp:282
#8  0x00007f1bf7002ff9 in doActivate<false>(QObject*, int, void**)
(sender=0x55a73ce440d0, signal_index=13, argv=0x7ffc4bfb05b0) at
kernel/qobject.cpp:3898

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