ListView crash when an item is removed from the model

The List view crashes when an item is removed to reproduce

prelim: The code required may not have made it into master, see https://codereview.qt-project.org/#change,18530 patchset 4 for the code to reproduce the problem.

1) ensure jsondb is running in the background via, jsondb &
2) run the qml_location_places example in qtlocation/examples/declarative/places
3) Click "Provider" then "nokia_places_jsondb" to switch to the jsondb plugin (which is a storage for user defined places)
4) Create 3 new categories by using by clicking "New" and "Category". Enter a name and click the "Go" button to create each category
5) Open the dialog for creating new place by clicking "New" then "Place". (Don't click "Go" since we don't need to actually save it)
6) On the same dialog, click the "Categories" button near the bottom left, observe a switch to a new 'middle' pane(this shows a list of assigned categories). Then click "Add Category" and observe the switch to a new pane again, showing the 3 created categories.
7) Click on a category name to add it to the list of a assigned to the place, use "Add Category" again until all 3 categories have been assigned
8) Click on one of the crosses on the right side to delete a category, observe that the program crashes

(Note that once the categories have been created, it is no longer necessary to create them again, you can simply skip to step 5 if you've already run through the instructions once)

The backtrace is as follows:
#0 0xb7bce8f8 in QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::data (this=0x4)
at ../../../qtbase/include/QtCore/../../../../../depot/qt/json-qt5/qtbase/src/corelib/tools/qscopedpointer.h:132
#1 0xb7c862ce in qGetPtrHelper<QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> > > (p=...)
at ../../../qtbase/include/QtCore/../../../../../depot/qt/json-qt5/qtbase/src/corelib/global/qglobal.h:1393
#2 0xb7c8669e in QQuickItem::d_func (this=0x0)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickitem.h:413
#3 0xb7c866b1 in QQuickItemPrivate::get (item=0x0)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickitem_p.h:237
#4 0xb7ca26a0 in QQuickCanvasPrivate::setFocusInScope (this=0x80c8c00, scope=0x8145150, item=0xb371fc00, options=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickcanvas.cpp:529
#5 0xb7c948a2 in QQuickItem::setFocus (this=0xb371fc00, focus=true)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickitem.cpp:4656
#6 0xb7da8969 in QQuickItemViewPrivate::updateCurrent (this=0x81451a8, modelIndex=0)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickitemview.cpp:2130
#7 0xb7da37f3 in QQuickItemView::setModel (this=0x8145150, model=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickitemview.cpp:860
#8 0xb7e70281 in QQuickItemView::qt_metacall (this=0x8145150, _c=QMetaObject::WriteProperty, _id=0, _a=0xbfffc9b0)
at .moc/debug-shared/moc_qquickitemview_p.cpp:569
#9 0xb7e5ccd8 in QQuickListView::qt_metacall (this=0x8145150, _c=QMetaObject::WriteProperty, _id=76, _a=0xbfffc9b0)
at .moc/debug-shared/moc_qquicklistview_p.cpp:401
#10 0xb6888d9e in QMetaObject::metacall (object=0x8145150, cl=QMetaObject::WriteProperty, idx=76, argv=0xbfffc9b0)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:248
#11 0xb7894d27 in QDeclarativePropertyPrivate::write (object=0x8145150, property=..., value=..., context=0x80f9d80,
--Type <return> to continue, or q <return> to quit--
flags=...) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeproperty.cpp:1282
#12 0xb789467f in QDeclarativePropertyPrivate::writeValueProperty (object=0x8145150, engine=0x80c8d50, core=...,
value=..., context=0x80f9d80, flags=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeproperty.cpp:1212
#13 0xb7896511 in QDeclarativePropertyPrivate::writeBinding (object=0x8145150, core=..., context=0x80f9d80,
expression=0x80fa784, result=..., isUndefined=false, flags=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeproperty.cpp:1504
#14 0xb79db965 in QV8Bindings::Binding::update (this=0x80fa774, flags=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8bindings.cpp:134
#15 0xb79dbe03 in QV8Bindings::Binding::expressionChanged (e=0x80fa784)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8bindings.cpp:176
#16 0xb788b51b in QDeclarativeJavaScriptExpressionGuard::endpointCallback (e=0x823c4e8)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression_p.h:388
#17 0xb792f5d1 in QDeclarativeNotifier::emitNotify (endpoint=0x0)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativenotifier.cpp:60
#18 0xb7874e2e in QDeclarativeData::signalEmitted (object=0x888ee18, index=6)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeengine.cpp:422
#19 0xb68b7a02 in QMetaObject::activate (sender=0x888ee18, m=0xb25df868, local_signal_index=1, argv=0x0)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qobject.cpp:3134
#20 0xb258e6a5 in QDeclarativePlace::categoriesChanged (this=0x888ee18)
at .moc/debug-shared/moc_qdeclarativeplace_p.cpp:515
#21 0xb25808e0 in QDeclarativePlace::category_append (prop=0xbfffcfe0, value=0x8604fd0)
at /home/achoy/depot/qt/json-qt5/qtlocation/src/imports/location/declarativeplaces/qdeclarativeplace.cpp:905
--Type <return> to continue, or q <return> to quit--
#22 0xb789519f in QDeclarativePropertyPrivate::write (object=0x888ee18, property=..., value=..., context=0x8693e78,
flags=...) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeproperty.cpp:1347
#23 0xb79c371d in StoreProperty (engine=0x80cada0, object=0x888ee18, property=0x88a2938, value=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8qobjectwrapper.cpp:648
#24 0xb79c3bca in QV8QObjectWrapper::SetProperty (engine=0x80cada0, object=0x888ee18, property=..., value=...,
revisionMode=QV8QObjectWrapper::IgnoreRevision)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8qobjectwrapper.cpp:689
#25 0xb79c3ef8 in QV8QObjectWrapper::Setter (property=..., value=..., info=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8qobjectwrapper.cpp:751
#26 0xb73a5be1 in v8::internal::JSObject::SetPropertyWithInterceptor (this=0x32f08269, name=0x3a01a571,
value=0x32f5a7b1, attributes=NONE, strict_mode=v8::internal::kNonStrictMode)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/objects.cc:1965
#27 0xb73a97ff in v8::internal::JSObject::SetPropertyForResult (this=0x32f08269, result=0xbfffd574, name=0x3a01a571,
value=0x32f5a7b1, attributes=NONE, strict_mode=v8::internal::kNonStrictMode)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/objects.cc:3016
#28 0xb73a7f70 in v8::internal::JSReceiver::SetProperty (this=0x32f08269, result=0xbfffd574, key=0x3a01a571,
value=0x32f5a7b1, attributes=NONE, strict_mode=v8::internal::kNonStrictMode)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/objects.cc:2658
#29 0xb73a5da3 in v8::internal::JSReceiver::SetProperty (this=0x32f08269, name=0x3a01a571, value=0x32f5a7b1,
attributes=NONE, strict_mode=v8::internal::kNonStrictMode, skip_fallback_interceptor=false)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/objects.cc:1987
#30 0xb73431ab in v8::internal::StoreIC::Store (this=0xbfffd654, state=v8::internal::UNINITIALIZED,
strict_mode=v8::internal::kNonStrictMode, object=..., name=..., value=...)
--Type <return> to continue, or q <return> to quit--
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/ic.cc:1323
#31 0xb73459fd in v8::internal::StoreIC_Miss (args=..., isolate=0x80947d8)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/ic.cc:1858
#32 0x35f08716 in ?? ()
#33 0x35f74fa2 in ?? ()
#34 0x35f1fb59 in ?? ()
#35 0x35f0d705 in ?? ()
#36 0xb729642d in v8::internal::Invoke (is_construct=false, function=..., receiver=..., argc=0, args=0x0,
has_pending_exception=0xbfffd8ef, qml=...)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/execution.cc:125
#37 0xb729682d in v8::internal::Execution::Call (callable=..., receiver=..., argc=0, argv=0x0,
pending_exception=0xbfffd8ef, convert_receiver=false, qml=...)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/execution.cc:194
#38 0xb729662d in v8::internal::Execution::Call (callable=..., receiver=..., argc=0, argv=0x0,
pending_exception=0xbfffd8ef, convert_receiver=false)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/execution.cc:161
#39 0xb7210cb0 in v8::Function::Call (this=0x891cdc8, recv=..., argc=0, argv=0x0)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/api.cc:3655
#40 0xb788943d in QDeclarativeJavaScriptExpression::evaluate (this=0x8394c1c, context=0x8693e78, function=...,
isUndefined=0x0) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression.cpp:576
#41 0xb788a19e in QDeclarativeExpressionPrivate::v8value (this=0x8394bd0, secondaryScope=0x0, isUndefined=0x0)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression.cpp:732
#42 0xb788a2e7 in QDeclarativeExpressionPrivate::value (this=0x8394bd0, secondaryScope=0x0, isUndefined=0x0)
--Type <return> to continue, or q <return> to quit--
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression.cpp:753
#43 0xb78dc98a in QDeclarativeBoundSignal::qt_metacall (this=0x85e8ad8, c=QMetaObject::InvokeMetaMethod, id=5,
a=0xbfffdf10) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeboundsignal.cpp:188
#44 0xb6888d9e in QMetaObject::metacall (object=0x85e8ad8, cl=QMetaObject::InvokeMetaMethod, idx=5, argv=0xbfffdf10)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:248
#45 0xb68b80a2 in QMetaObject::activate (sender=0x83cbcc8, m=0x83b087c, local_signal_index=3, argv=0xbfffdf10)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qobject.cpp:3263
#46 0xb68b82ae in QMetaObject::activate (sender=0x83cbcc8, signal_index=37, argv=0xbfffdf10)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qobject.cpp:3296
#47 0xb786e773 in QDeclarativeVMEMetaObject::metaCall (this=0x83b0878, c=QMetaObject::InvokeMetaMethod, _id=37,
a=0xbfffdf10) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativevmemetaobject.cpp:720
#48 0xb6888d75 in QMetaObject::metacall (object=0x83cbcc8, cl=QMetaObject::InvokeMetaMethod, idx=37, argv=0xbfffdf10)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:246
#49 0xb79c7f49 in CallMethod (object=0x83cbcc8, index=37, returnType=0, argCount=0, argTypes=0x0, engine=0x80cada0,
callArgs=...) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8qobjectwrapper.cpp:1507
#50 0xb79c8a29 in CallPrecise (object=0x83cbcc8, data=..., engine=0x80cada0, callArgs=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8qobjectwrapper.cpp:1720
#51 0xb79c993b in QV8QObjectWrapper::Invoke (args=...)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/v8/qv8qobjectwrapper.cpp:1922
#52 0xb7259767 in v8::internal::HandleApiCallHelper<false> (args=..., isolate=0x80947d8)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/builtins.cc:1164
#53 0xb7254053 in v8::internal::Builtin_Impl_HandleApiCall (args=..., isolate=0x80947d8)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/builtins.cc:1181
--Type <return> to continue, or q <return> to quit--
#54 0xb725402e in v8::internal::Builtin_HandleApiCall (args=..., isolate=0x80947d8)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/builtins.cc:1180
#55 0x35f08716 in ?? ()
#56 0x35f23143 in ?? ()
#57 0x35f74dab in ?? ()
#58 0x35f1fb59 in ?? ()
#59 0x35f0d705 in ?? ()
#60 0xb729642d in v8::internal::Invoke (is_construct=false, function=..., receiver=..., argc=0, args=0x0,
has_pending_exception=0xbfffe5af, qml=...)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/execution.cc:125
#61 0xb729682d in v8::internal::Execution::Call (callable=..., receiver=..., argc=0, argv=0x0,
pending_exception=0xbfffe5af, convert_receiver=false, qml=...)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/execution.cc:194
#62 0xb729662d in v8::internal::Execution::Call (callable=..., receiver=..., argc=0, argv=0x0,
pending_exception=0xbfffe5af, convert_receiver=false)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/execution.cc:161
#63 0xb7210cb0 in v8::Function::Call (this=0x891cda8, recv=..., argc=0, argv=0x0)
at /home/achoy/depot/qt/json-qt5/qtjsbackend/src/3rdparty/v8/src/api.cc:3655
#64 0xb788943d in QDeclarativeJavaScriptExpression::evaluate (this=0x88b8dd4, context=0x88c59e8, function=...,
isUndefined=0x0) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression.cpp:576
#65 0xb788a127 in QDeclarativeExpressionPrivate::v8value (this=0x88b8d88, secondaryScope=0xb37206e0, isUndefined=0x0)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression.cpp:728
#66 0xb788a2e7 in QDeclarativeExpressionPrivate::value (this=0x88b8d88, secondaryScope=0xb37206e0, isUndefined=0x0)
--Type <return> to continue, or q <return> to quit--
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeexpression.cpp:753
#67 0xb78dc98a in QDeclarativeBoundSignal::qt_metacall (this=0x8377670, c=QMetaObject::InvokeMetaMethod, id=5,
a=0xbfffe968) at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/declarative/qml/qdeclarativeboundsignal.cpp:188
#68 0xb6888d9e in QMetaObject::metacall (object=0x8377670, cl=QMetaObject::InvokeMetaMethod, idx=5, argv=0xbfffe968)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:248
#69 0xb68b80a2 in QMetaObject::activate (sender=0x88cdb50, m=0xb7fd7204, local_signal_index=13, argv=0xbfffe968)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qobject.cpp:3263
#70 0xb7e58c0c in QQuickMouseArea::clicked (this=0x88cdb50, _t1=0xbfffe9d8)
at .moc/debug-shared/moc_qquickmousearea_p.cpp:670
#71 0xb7d25131 in QQuickMouseArea::setPressed (this=0x88cdb50, p=false)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickmousearea.cpp:1118
#72 0xb7d23bcf in QQuickMouseArea::mouseReleaseEvent (this=0x88cdb50, event=0xbfffeb04)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickmousearea.cpp:790
#73 0xb7c9119a in QQuickItemPrivate::deliverMouseEvent (this=0x8377538, e=0xbfffeb04)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickitem.cpp:3575
#74 0xb7ca7124 in QQuickCanvas::sendEvent (this=0xbffff314, item=0x88cdb50, e=0xbfffeb04)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickcanvas.cpp:1524
#75 0xb7ca446f in QQuickCanvasPrivate::deliverMouseEvent (this=0x80c8c00, event=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickcanvas.cpp:958
#76 0xb7ca4596 in QQuickCanvas::mouseReleaseEvent (this=0xbffff314, event=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickcanvas.cpp:993
#77 0xb7d8014a in QQuickView::mouseReleaseEvent (this=0xbffff314, e=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickview.cpp:532
--Type <return> to continue, or q <return> to quit--
#78 0xb6c1e01b in QWindow::event (this=0xbffff314, ev=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtbase/src/gui/kernel/qwindow.cpp:965
#79 0xb7ca3cdc in QQuickCanvas::event (this=0xbffff314, e=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtdeclarative/src/quick/items/qquickcanvas.cpp:872
#80 0xb68814e1 in QCoreApplicationPrivate::notify_helper (this=0x809d088, receiver=0xbffff314, event=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:815
#81 0xb6881235 in QCoreApplication::notify (this=0xbffff368, receiver=0xbffff314, event=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:761
#82 0xb6c11de5 in QGuiApplication::notify (this=0xbffff368, object=0xbffff314, event=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtbase/src/gui/kernel/qguiapplication.cpp:784
#83 0xb688113f in QCoreApplication::notifyInternal (this=0xbffff368, receiver=0xbffff314, event=0xbfffee60)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:699
#84 0xb6c1698d in QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) ()
from /home/achoy/build/new-qt5/qtbase/lib/libQtGui.so.5
#85 0xb6c12659 in QGuiApplicationPrivate::processMouseEvent (e=0xb371f1f8)
at /home/achoy/depot/qt/json-qt5/qtbase/src/gui/kernel/qguiapplication.cpp:951
#86 0xb6c11eec in QGuiApplicationPrivate::processWindowSystemEvent (e=0xb371f1f8)
at /home/achoy/depot/qt/json-qt5/qtbase/src/gui/kernel/qguiapplication.cpp:814
#87 0xb6c049f8 in QWindowSystemInterface::sendWindowSystemEvents (eventDispatcher=0x80a52b8, flags=...)
at /home/achoy/depot/qt/json-qt5/qtbase/src/gui/kernel/qwindowsysteminterface_qpa.cpp:393
#88 0xb42b67c0 in userEventSourceDispatch (s=0x80ac9e8)
at /home/achoy/depot/qt/json-qt5/qtbase/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp:77
#89 0xb62215e5 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
--Type <return> to continue, or q <return> to quit--
#90 0xb62252d8 in ?? () from /lib/libglib-2.0.so.0
#91 0xb62254b8 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#92 0xb68e643a in QEventDispatcherGlib::processEvents (this=0x80a52b8, flags=...)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:424
#93 0xb687df26 in QEventLoop::processEvents (this=0xbffff29c, flags=...)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qeventloop.cpp:135
#94 0xb687e1e3 in QEventLoop::exec (this=0xbffff29c, flags=...)
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qeventloop.cpp:211
#95 0xb68817bf in QCoreApplication::exec ()
at /home/achoy/depot/qt/json-qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:951
#96 0xb6c11d35 in QGuiApplication::exec ()
at /home/achoy/depot/qt/json-qt5/qtbase/src/gui/kernel/qguiapplication.cpp:765
#97 0x0804a0dd in main (argc=1, argv=0xbffff464)
at /home/achoy/depot/qt/json-qt5/qtlocation/examples/declarative/places/qmlplaceswrapper.cpp:113