==12020== Invalid read of size 4                                                                                                                                                                     
==12020==    at 0x602DA3C: QGraphicsScene::d_func() const (qgraphicsscene.h:270)                                                                                                                     
==12020==    by 0x601F5CC: QGraphicsScene::views() const (qgraphicsscene.cpp:2903)                                                                                                                   
==12020==    by 0xBE0D395: WindowTaskItem::publishIconGeometry() (windowtaskitem.cpp:211)                                                                                                            
==12020==    by 0xBE0D730: WindowTaskItem::setGeometry(QRectF const&) (windowtaskitem.cpp:204)                                                                                                       
==12020==    by 0x60490BA: QGraphicsWidget::resize(QSizeF const&) (qgraphicswidget.cpp:249)                                                                                                          
==12020==    by 0x604A99F: QGraphicsWidget::updateGeometry() (qgraphicswidget.cpp:874)                                                                                                               
==12020==    by 0xBE0922F: AbstractTaskItem::setIcon(QIcon const&) (abstracttaskitem.cpp:230)                                                                                                        
==12020==    by 0xBE0DCD7: WindowTaskItem::updateTask() (windowtaskitem.cpp:118)                                                                                                                     
==12020==    by 0xBE0DDDC: WindowTaskItem::qt_metacall(QMetaObject::Call, int, void**) (windowtaskitem.moc:72)                                                                                       
==12020==    by 0x57C2422: QMetaObject::activate(QObject*, int, int, void**) (qobject.cpp:2998)                                                                                                      
==12020==    by 0x57C28A4: QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (qobject.cpp:3071)                                                                                       
==12020==    by 0xBE20B20: TaskManager::Task::changed() (task.moc:224)