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//scene rect. If the connection was direct, we could thus enter an infinite
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//loop when the constraint visualizer enlarges itself in reaction to the
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//changed sceneRect, thereby changing the autogrowing sceneRect again.
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connect(scene, SIGNAL(sceneRectChanged(const QRectF&)), this, SLOT(update(const QRectF&)), Qt::QueuedConnection);
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connect(scene, SIGNAL(sceneRectChanged(QRectF)), this, SLOT(update(QRectF)), Qt::QueuedConnection);
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bool Palapeli::ConstraintVisualizer::isActive() const