https://bugs.kde.org/show_bug.cgi?id=396666

            Bug ID: 396666
           Summary: Assert dragging desktop items
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Folder
          Assignee: h...@kde.org
          Reporter: k...@davidedmundson.co.uk
                CC: plasma-b...@kde.org
  Target Milestone: 1.0

Thread 1 "plasmashell" received signal SIGABRT, Aborted.
0x00007ffff032d86b in raise () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007ffff032d86b in raise () at /usr/lib/libc.so.6
#1  0x00007ffff031840e in abort () at /usr/lib/libc.so.6
#2  0x00007ffff1085d04 in qt_message_fatal(QtMsgType, QMessageLogContext
const&, QString const&) (context=..., message=...)
    at /home/david/projects/qt5/qtbase/src/corelib/global/qlogging.cpp:1842
#3  0x00007ffff1086a8d in QMessageLogger::fatal(char const*, ...) const
(this=this@entry=0x7fffffff7360, msg=msg@entry=0x7ffff13214d8 "ASSERT: \"%s\"
in file %s, line %d")
    at /home/david/projects/qt5/qtbase/src/corelib/global/qlogging.cpp:880
#4  0x00007ffff107f6c2 in qt_assert(char const*, char const*, int)
(assertion=assertion@entry=0x7ffff133026a "last < rowCount(parent)",
file=file@entry=0x7ffff13276d8
"/home/david/projects/qt5/qtbase/src/corelib/itemmodels/qabstractitemmodel.cpp",
line=line@entry=2766) at
/home/david/projects/qt5/qtbase/src/corelib/global/qglobal.cpp:3193
#5  0x00007ffff120fd94 in QAbstractItemModel::beginRemoveRows(QModelIndex
const&, int, int) (this=0x5555563a2850, parent=..., first=5, last=16)
    at
/home/david/projects/qt5/qtbase/src/corelib/itemmodels/qabstractitemmodel.cpp:2766
#6  0x00007fffc8ad73a0 in Positioner::move(QList<QVariant> const&)
(this=0x5555563a2850, moves=...)
    at
/home/david/projects/kde5/src/kde/workspace/plasma-desktop/containments/desktop/plugins/folder/positioner.cpp:437
#7  0x00007fffc8af4309 in Positioner::qt_static_metacall(QObject*,
QMetaObject::Call, int, void**) (_o=0x5555563a2850,
_c=QMetaObject::InvokeMetaMethod, _id=22, _a=0x7fffffff7620) at
containments/desktop/plugins/folder/folderplugin_autogen/EWIEGA46WW/moc_positioner.cpp:238
#8  0x00007fffc8af47d1 in Positioner::qt_metacall(QMetaObject::Call, int,
void**) (this=0x5555563a2850, _c=QMetaObject::InvokeMetaMethod, _id=22,
_a=0x7fffffff7620)
    at
containments/desktop/plugins/folder/folderplugin_autogen/EWIEGA46WW/moc_positioner.cpp:337
#9  0x00007ffff12628a4 in QMetaObject::metacall(QObject*, QMetaObject::Call,
int, void**) (object=<optimized out>, cl=<optimized out>, idx=<optimized out>,
argv=<optimized out>) at
/home/david/projects/qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:301
#10 0x00007ffff528796b in QQmlObjectOrGadget::metacall(QMetaObject::Call, int,
void**) const (this=this@entry=0x7fffffff7930,
type=type@entry=QMetaObject::InvokeMetaMethod, index=<optimized out>,
index@entry=77, argv=0x7fffffff7620) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlpropertycache.cpp:1733
#11 0x00007ffff51d94d5 in CallMethod(QQmlObjectOrGadget const&, int, int, int,
int*, QV4::ExecutionEngine*, QV4::CallData*, QMetaObject::Call) (object=...,
index=<optimized out>, returnType=returnType@entry=43, argCount=<optimized
out>, argTypes=<optimized out>, engine=engine@entry=0x55555590dc50,
callArgs=<optimized out>, callType=<optimized out>)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1175
#12 0x00007ffff51d9bd7 in CallPrecise(QQmlObjectOrGadget const&,
QQmlPropertyData const&, QV4::ExecutionEngine*, QV4::CallData*,
QMetaObject::Call) (object=..., data=..., engine=engine@entry=0x55555590dc50,
callArgs=callArgs@entry=0x7fffe04546b8,
callType=callType@entry=QMetaObject::InvokeMetaMethod)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1437
#13 0x00007ffff51da498 in QV4::QObjectMethod::callInternal(QV4::Value const*,
QV4::Value const*, int) const (this=0x7fffe04546b0, thisObject=0x7fffe0454658,
argv=0x7fffe0454610, argc=1) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1975
#14 0x00007ffff51da831 in QV4::QObjectMethod::call(QV4::FunctionObject const*,
QV4::Value const*, QV4::Value const*, int) (m=<optimized out>,
thisObject=<optimized out>, argv=<optimized out>, argc=<optimized out>) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1912
#15 0x00007ffff51ffab5 in QV4::FunctionObject::call(QV4::Value const*,
QV4::Value const*, int) const (argc=1, argv=0x7fffe0454610,
thisObject=0x7fffe0454658, this=<optimized out>) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4functionobject_p.h:163
#16 0x00007ffff51ffab5 in
QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, QV4::Value*, int,
QV4::Value*, int) (engine=engine@entry=0x55555590dc50, base=0x7fffe0454658,
nameIndex=<optimized out>, argv=0x7fffe0454610, argc=1) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4runtime.cpp:1062
#17 0x00007ffff51ecced in QV4::Moth::VME::exec(QV4::FunctionObject const*,
QV4::Value const*, QV4::Value const*, int) (fo=<optimized out>, 
    fo@entry=0x7fffffff7c51, thisObject=thisObject@entry=0x7fffe0454568,
argv=argv@entry=0x7fffe0454578, argc=<optimized out>)
---Type <return> to continue, or q <return> to quit---
   /jsruntime/qv4vme_moth.cpp:800                                               
#18 0x00007ffff52bf2a0 in QV4::Moth::VME::exec(QV4::Function*, QV4::Value
const*, QV4::Value const*, int, QV4::ExecutionContext const*)
(context=<optimized out>, argc=<optimized out>, argv=0x7fffe0454578,
thisObject=0x7fffe0454568, v4Function=0x5555563865f0) at
../../include/QtQml/5.11.1/QtQml/private/../../../../../../../qt5/qtdeclarative/src/qml/jsruntime/qv4vme_moth_p.h:72
 
#19 0x00007ffff52bf2a0 in QV4::Function::call(QV4::Value const*, QV4::Value
const*, int, QV4::ExecutionContext const*) (context=<optimized out>,
argc=<optimized out>, argv=0x7fffe0454578, thisObject=0x7fffe0454568,
this=0x5555563865f0) at
../../include/QtQml/5.11.1/QtQml/private/../../../../../../../qt5/qtdeclarative/src/qml/jsruntime/qv4function_p.h:72
 
#20 0x00007ffff52bf2a0 in QQmlJavaScriptExpression::evaluate(QV4::CallData*,
bool*) (this=this@entry=0x5555563b2d20, callData=callData@entry=0x7fffe0454550,
isUndefined=isUndefined@entry=0x0)                                  
    at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmljavascriptexpression.cpp:217
 
#21 0x00007ffff5246db4 in QQmlBoundSignalExpression::evaluate(void**)
(this=0x5555563b2d20, a=a@entry=0x7fffffff98d0) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlboundsignal.cpp:237      
#22 0x00007ffff524714a in QQmlBoundSignal_callback(QQmlNotifierEndpoint*,
void**) (e=0x5555563b2ca0, a=0x7fffffff98d0) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlboundsignal.cpp:370      
#23 0x00007ffff5292585 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*,
void**) (endpoint=<optimized out>, a=a@entry=0x7fffffff98d0) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlnotifier.cpp:106         
#24 0x00007ffff5221a1a in QQmlData::signalEmitted(QAbstractDeclarativeData*,
QObject*, int, void**) (object=0x5555563a5940, index=50, a=0x7fffffff98d0) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlengine.cpp:861 
#25 0x00007ffff1288765 in QMetaObject::activate(QObject*, int, int, void**)
(sender=sender@entry=0x5555563a5940, signalOffset=<optimized out>,
local_signal_index=local_signal_index@entry=23, argv=argv@entry=0x7fffffff98d0) 
    at /home/david/projects/qt5/qtbase/src/corelib/kernel/qobject.cpp:3648      
#26 0x00007ffff12890bd in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) (sender=0x5555563a5940, m=<optimized out>, local_signal_index=23,
argv=0x7fffffff98d0)                                                
    at /home/david/projects/qt5/qtbase/src/corelib/kernel/qobject.cpp:3633      
#27 0x00007fffc8af2552 in FolderModel::move(int, int, QList<QUrl>)
(this=0x5555563a5940, _t1=314, _t2=74, _t3=...) at
containments/desktop/plugins/folder/folderplugin_autogen/EWIEGA46WW/moc_foldermodel.cpp:1109
#28 0x00007fffc8aad8ad in FolderModel::drop(QQuickItem*, QObject*, int)
(this=0x5555563a5940, target=0x5555562fa920, dropEvent=0x7fffffffc340, row=-1)
    at
/home/david/projects/kde5/src/kde/workspace/plasma-desktop/containments/desktop/plugins/folder/foldermodel.cpp:1085
#29 0x00007fffc8af0b20 in FolderModel::qt_static_metacall(QObject*,
QMetaObject::Call, int, void**) (_o=0x5555563a5940,
_c=QMetaObject::InvokeMetaMethod, _id=59, _a=0x7fffffff9dd0)
    at
containments/desktop/plugins/folder/folderplugin_autogen/EWIEGA46WW/moc_foldermodel.cpp:631
#30 0x00007fffc8af203d in FolderModel::qt_metacall(QMetaObject::Call, int,
void**) (this=0x5555563a5940, _c=QMetaObject::InvokeMetaMethod, _id=59,
_a=0x7fffffff9dd0)
    at
containments/desktop/plugins/folder/folderplugin_autogen/EWIEGA46WW/moc_foldermodel.cpp:940
#31 0x00007ffff12628a4 in QMetaObject::metacall(QObject*, QMetaObject::Call,
int, void**) (object=<optimized out>, cl=<optimized out>, idx=<optimized out>,
argv=<optimized out>)
    at /home/david/projects/qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:301
#32 0x00007ffff528796b in QQmlObjectOrGadget::metacall(QMetaObject::Call, int,
void**) const (this=this@entry=0x7fffffffa0e0,
type=type@entry=QMetaObject::InvokeMetaMethod, index=<optimized out>, 
    index@entry=145, argv=0x7fffffff9dd0) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlpropertycache.cpp:1733
#33 0x00007ffff51d94d5 in CallMethod(QQmlObjectOrGadget const&, int, int, int,
int*, QV4::ExecutionEngine*, QV4::CallData*, QMetaObject::Call) (object=...,
index=<optimized out>, returnType=returnType@entry=43, argCount=<optimized
out>, argTypes=<optimized out>, engine=engine@entry=0x55555590dc50,
callArgs=<optimized out>, callType=<optimized out>) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1175
#34 0x00007ffff51d9bd7 in CallPrecise(QQmlObjectOrGadget const&,
QQmlPropertyData const&, QV4::ExecutionEngine*, QV4::CallData*,
QMetaObject::Call) (object=..., data=..., engine=engine@entry=0x55555590dc50,
callArgs=callArgs@entry=0x7fffe04544f0,
callType=callType@entry=QMetaObject::InvokeMetaMethod) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1437
#35 0x00007ffff51da498 in QV4::QObjectMethod::callInternal(QV4::Value const*,
QV4::Value const*, int) const (this=0x7fffe04544e8, thisObject=0x7fffe0454490,
argv=0x7fffe0454498, argc=3)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1975
#36 0x00007ffff51da831 in QV4::QObjectMethod::call(QV4::FunctionObject const*,
QV4::Value const*, QV4::Value const*, int) (m=<optimized out>,
thisObject=<optimized out>, argv=<optimized out>, argc=<optimized out>)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:1912
#37 0x00007ffff51ffab5 in QV4::FunctionObject::call(QV4::Value const*,
QV4::Value const*, int) const (argc=3, argv=0x7fffe0454498,
thisObject=0x7fffe0454490, this=<optimized out>)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4functionobject_p.h:163
#38 0x00007ffff51ffab5 in
QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, QV4::Value*, int,
QV4::Value*, int) (engine=engine@entry=0x55555590dc50, base=0x7fffe0454490,
nameIndex=<optimized out>, argv=0x7fffe0454498, argc=3) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4runtime.cpp:1062
#39 0x00007ffff51ecced in QV4::Moth::VME::exec(QV4::FunctionObject const*,
QV4::Value const*, QV4::Value const*, int) (fo=<optimized out>,
thisObject=<optimized out>, argv=<optimized out>, argc=<optimized out>)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4vme_moth.cpp:800
#40 0x00007ffff513cb01 in QV4::ScriptFunction::call(QV4::FunctionObject const*,
QV4::Value const*, QV4::Value const*, int) (fo=<optimized out>,
thisObject=<optimized out>, argv=<optimized out>, argc=<optimized out>)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4functionobject.cpp:408
#41 0x00007ffff51ffab5 in QV4::FunctionObject::call(QV4::Value const*,
QV4::Value const*, int) const (argc=3, argv=0x7fffe04543b0,
thisObject=0x7fffe04543a8, this=<optimized out>)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4functionobject_p.h:163
#42 0x00007ffff51ffab5 in
QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, QV4::Value*, int,
QV4::Value*, int) (engine=engine@entry=0x55555590dc50, base=0x7fffe04543a8,
nameIndex=<optimized out>, argv=0x7fffe04543b0, argc=3) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4runtime.cpp:1062
#43 0x00007ffff51ecced in QV4::Moth::VME::exec(QV4::FunctionObject const*,
QV4::Value const*, QV4::Value const*, int) (fo=<optimized out>, 
    fo@entry=0x7fffffffa5f1, thisObject=thisObject@entry=0x7fffe0454348,
argv=argv@entry=0x7fffe0454358, argc=<optimized out>) at
/home/david/projects/qt5/qtdeclarative/src/qml/jsruntime/qv4vme_moth.cpp:800
#44 0x00007ffff52bf2a0 in QV4::Moth::VME::exec(QV4::Function*, QV4::Value
const*, QV4::Value const*, int, QV4::ExecutionContext const*)
(context=<optimized out>, argc=<optimized out>, argv=0x7fffe0454358,
thisObject=0x7fffe0454348, v4Function=0x555555f6bae0) at
../../include/QtQml/5.11.1/QtQml/private/../../../../../../../qt5/qtdeclarative/src/qml/jsruntime/qv4vme_moth_p.h:72
#45 0x00007ffff52bf2a0 in QV4::Function::call(QV4::Value const*, QV4::Value
const*, int, QV4::ExecutionContext const*) (context=<optimized out>,
argc=<optimized out>, argv=0x7fffe0454358, thisObject=0x7fffe0454348,
this=0x555---Type <return> to continue, or q <return> to quit---
555f6bae0) at
../../include/QtQml/5.11.1/QtQml/private/../../../../../../../qt5/qtdeclarative/src/qml/jsruntime/qv4function_p.h:72
#46 0x00007ffff52bf2a0 in QQmlJavaScriptExpression::evaluate(QV4::CallData*,
bool*) (this=this@entry=0x55555630fcc0, callData=callData@entry=0x7fffe0454330,
isUndefined=isUndefined@entry=0x0)
    at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmljavascriptexpression.cpp:217
#47 0x00007ffff5246db4 in QQmlBoundSignalExpression::evaluate(void**)
(this=0x55555630fcc0, a=a@entry=0x7fffffffc260) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlboundsignal.cpp:237
#48 0x00007ffff524714a in QQmlBoundSignal_callback(QQmlNotifierEndpoint*,
void**) (e=0x555556313d00, a=0x7fffffffc260) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlboundsignal.cpp:370
#49 0x00007ffff5292585 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*,
void**) (endpoint=<optimized out>, a=a@entry=0x7fffffffc260) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlnotifier.cpp:106
#50 0x00007ffff5221a1a in QQmlData::signalEmitted(QAbstractDeclarativeData*,
QObject*, int, void**) (object=0x5555562fa920, index=33, a=0x7fffffffc260) at
/home/david/projects/qt5/qtdeclarative/src/qml/qml/qqmlengine.cpp:861
#51 0x00007ffff1288765 in QMetaObject::activate(QObject*, int, int, void**)
(sender=sender@entry=0x5555562fa920, signalOffset=<optimized out>,
local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fffffffc260)
    at /home/david/projects/qt5/qtbase/src/corelib/kernel/qobject.cpp:3648
#52 0x00007ffff12890bd in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) (sender=0x5555562fa920, m=<optimized out>, local_signal_index=3,
argv=0x7fffffffc260)
    at /home/david/projects/qt5/qtbase/src/corelib/kernel/qobject.cpp:3633
#53 0x00007fffc98e9b0c in DeclarativeDropArea::drop(DeclarativeDragDropEvent*)
(this=0x5555562fa920, _t1=0x7fffffffc340) at
src/qmlcontrols/draganddrop/draganddropplugin_autogen/EWIEGA46WW/moc_DeclarativeDropArea.cpp:284
#54 0x00007fffc98e5edd in DeclarativeDropArea::dropEvent(QDropEvent*)
(this=0x5555562fa920, event=0x7fffffffc620)
    at
/home/david/projects/kde5/src/frameworks/kdeclarative/src/qmlcontrols/draganddrop/DeclarativeDropArea.cpp:121
#55 0x00007ffff56b0192 in QQuickItem::event(QEvent*) (this=0x5555562fa920,
ev=0x7fffffffc620) at
/home/david/projects/qt5/qtdeclarative/src/quick/items/qquickitem.cpp:7994
#56 0x00007ffff232f2c3 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=this@entry=0x555555851dc0, receiver=receiver@entry=0x5555562fa920,
e=e@entry=0x7fffffffc620)
    at /home/david/projects/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3727
#57 0x00007ffff2336b0c in QApplication::notify(QObject*, QEvent*)
(this=0x7fffffffde70, receiver=0x5555562fa920, e=0x7fffffffc620) at
/home/david/projects/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3099
#58 0x00007ffff12570b5 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=0x5555562fa920, event=event@entry=0x7fffffffc620) at
/home/david/projects/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1048
#59 0x00007ffff56cd7b0 in QCoreApplication::sendEvent(QObject*, QEvent*)
(event=0x7fffffffc620, receiver=<optimized out>)
    at
/home/david/projects/qt5-build/qtbase/include/QtCore/../../../../qt5/qtbase/src/corelib/kernel/qcoreapplication.h:234
#60 0x00007ffff56cd7b0 in
QQuickWindowPrivate::deliverDragEvent(QQuickDragGrabber*, QEvent*)
(this=this@entry=0x555555ce5380, grabber=0x555555c784b0,
event=event@entry=0x7fffffffc930)
    at
/home/david/projects/qt5/qtdeclarative/src/quick/items/qquickwindow.cpp:2647
#61 0x00007ffff56ce027 in QQuickWindow::event(QEvent*) (this=0x555555c7db50,
e=0x7fffffffc930) at
/home/david/projects/qt5/qtdeclarative/src/quick/items/qquickwindow.cpp:1591
#62 0x0000555555584c0b in DesktopView::event(QEvent*) (this=0x555555c7db50,
e=0x7fffffffc930) at
/home/david/projects/kde5/src/kde/workspace/plasma-workspace/shell/desktopview.cpp:237
#63 0x00007ffff232f2c3 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=this@entry=0x555555851dc0, receiver=receiver@entry=0x555555c7db50,
e=e@entry=0x7fffffffc930)
    at /home/david/projects/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3727
#64 0x00007ffff2336b0c in QApplication::notify(QObject*, QEvent*)
(this=0x7fffffffde70, receiver=0x555555c7db50, e=0x7fffffffc930) at
/home/david/projects/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3099
#65 0x00007ffff12570b5 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=receiver@entry=0x555555c7db50, event=event@entry=0x7fffffffc930)
    at
/home/david/projects/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1048
#66 0x00007ffff16170d0 in QCoreApplication::sendEvent(QObject*, QEvent*)
(event=0x7fffffffc930, receiver=0x555555c7db50) at
../../include/QtCore/../../../../qt5/qtbase/src/corelib/kernel/qcoreapplication.h:234
#67 0x00007ffff16170d0 in QGuiApplicationPrivate::processDrop(QWindow*,
QMimeData const*, QPoint const&, QFlags<Qt::DropAction>)
(w=w@entry=0x555555c7db50, dropData=dropData@entry=0x5555572ae960, p=...,
supportedActions=supportedActions@entry=...) at
/home/david/projects/qt5/qtbase/src/gui/kernel/qguiapplication.cpp:3101
#68 0x00007ffff15ef250 in QWindowSystemInterface::handleDrop(QWindow*,
QMimeData const*, QPoint const&, QFlags<Qt::DropAction>)
(window=0x555555c7db50, dropData=dropData@entry=0x5555572ae960, p=...,
supportedActions=...)
    at
/home/david/projects/qt5/qtbase/src/gui/kernel/qwindowsysteminterface.cpp:805
#69 0x00007fffe4c6005d in
QtWaylandClient::QWaylandDataDevice::data_device_drop() (this=0x5555558621a0)
at qwaylanddatadevice.cpp:145
#70 0x00007fffe4c64c0c in QtWayland::wl_data_device::handle_drop(void*,
wl_data_device*) (data=<optimized out>, object=<optimized out>) at
qwayland-wayland.cpp:756
#71 0x00007fffe84591c8 in ffi_call_unix64 () at /usr/lib/libffi.so.6
#72 0x00007fffe8458c2a in ffi_call () at /usr/lib/libffi.so.6
#73 0x00007fffef4aff9f in  () at /usr/lib/libwayland-client.so.0
#74 0x00007fffef4ac70a in  () at /usr/lib/libwayland-client.so.0
#75 0x00007fffef4adc5c in wl_display_dispatch_queue_pending () at
/usr/lib/libwayland-client.so.0
#76 0x00007fffe4c33784 in QtWaylandClient::QWaylandDisplay::flushRequests()
(this=0x5555558513f0) at qwaylanddisplay.cpp:182
#77 0x00007fffe4c67140 in
QtWaylandClient::QWaylandDisplay::qt_static_metacall(QObject*,
QMetaObject::Call, int, void**) (_o=_o@entry=0x5555558513f0,
_c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=1, _a=<optimized out>)
at .moc/moc_qwaylanddisplay_p.cpp:76
#78 0x00007ffff1288d94 in QMetaObject::activate(QObject*, int, int, void**)
(sender=sender@entry=0x555555876c70, signalOffset=<optimized out>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffffffcef0)
    at /home/david/projects/qt5/qtbase/src/corelib/kernel/qobject.cpp:3771
#79 0x00007ffff12890bd in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) (sender=sender@entry=0x555555876c70, m=m@entry=0x7ffff1504b60
<QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffffffcef0)
at /home/david/projects/qt5/qtbase/src/corelib/kernel/qobject.cpp:3633
#80 0x00007ffff1295141 in QSocketNotifier::activated(int,
QSocketNotifier::QPrivateSignal) (this=this@entry=0x555555876c70,
_t1=<optimized out>, _t2=...) at .moc/moc_qsocketnotifier.cpp:136
#81 0x00007ffff1295603 in QSocketNotifier::event(QEvent*) (this=0x555555876c70,
e=0x7fffffffd1a0) at
/home/david/projects/qt5/qtbase/src/corelib/kernel/qsocketnotifier.cpp:266


positioner.cpp:433
clearly moves index before calling beginRemoveRows which is very naughty.

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