When starting the game, exactly 8 identical warnings appear:

> QGraphicsScene::addItem: item has already been added to this scene

Their origin lies in the ScoreSprite constructor, which instantiates
several QGraphicsTextItems, passing itself as parent. Afterwards each
of them is explicitely added to the same scene as the ScoreSprite using
scene->addItem. However, this is redundant because passing the
ScoreSprite as parent already makes the new QGraphicsTextItems part of
the same scene. Hence the warning.

REVIEW:127869