Method childRemoved

src/backend/worksheet/InfoElement.cpp:615–656

! * Delete child and remove from markerpoint list if it is a markerpoint. If it is a textlabel delete complete InfoElement */

 * Delete child and remove from markerpoint list if it is a markerpoint. If it is a textlabel delete complete InfoElement
 */
void InfoElement::childRemoved(const AbstractAspect* parent, const AbstractAspect* /*before*/, const AbstractAspect* child) {
	Q_D(InfoElement);

	// when childs are reordered, don't remove them
	// problem: when the order was changed the elements are deleted for a short time and recreated. This function will called then
	if (m_suppressChildRemoved)
		return;

	if (parent != this) // why do I need this?
		return;

	// point removed
	const auto* point = dynamic_cast<const CustomPoint*>(child);
	if (point) {
		for (int i = 0; i < markerpoints.length(); i++) {
			if (point == markerpoints[i].customPoint)
				markerpoints.removeAt(i);
			// no point->remove() needed, because it was already deleted
		}
		// recreate text, because when marker was deleted,
		// the placeholder should not be replaced anymore by a value
		m_title->setUndoAware(false);
		m_title->setText(createTextLabelText());
		m_title->setUndoAware(true);
	}

	// textlabel was deleted
	const auto* textlabel = dynamic_cast<const TextLabel*>(child);
	if (textlabel) {
		Q_ASSERT(m_title == textlabel);
		m_title = nullptr;
		for (int i = 0; i < markerpoints.length(); i++) { // why it's not working without?
			m_suppressChildRemoved = true;
			markerpoints[i].customPoint->remove();
			markerpoints.removeAt(i);
			m_suppressChildRemoved = false;
		}
		remove(); // delete marker if textlabel was deleted, because there is no use case of this
	}

	d->retransform();
}

void InfoElement::childAdded(const AbstractAspect* child) {
	const auto* point = dynamic_cast<const CustomPoint*>(child);