Method fadeOut

src/frontend/worksheet/WorksheetView.cpp:1478–1482

}

void WorksheetView::fadeOut(qreal value) {
	auto* effect = new QGraphicsOpacityEffect();
	effect->setOpacity(1 - value);
	lastAddedWorksheetElement->graphicsItem()->setGraphicsEffect(effect);
}

/*!
 * called when one of the layout-actions in WorkseetView was triggered.