QGraphicsScene crash on clear and adding existing QGraphicsItem.

Application crash by calling QGraphicsScene::clear() method and re adding existing item:

MyClass::MyClass() {
    scene = new QGraphicsScene(...);
    item = new MyGraphicsItem();
    scene->addItem(item);
}
...
void MyClass::f() {
    scene->clear();
    scene->addItem(item);
}

by adding QGraphicsScene::removeItem(item) before ::clear() seems to solve issue:

void MyClass::f() {
    scene->removeItem(item);
    scene->clear();
    scene->addItem(item);
}

Same behavior by trying to add existing item two times.

Also, suggestion to add method that checks for item existence in QGraphicsScene.