Method validate

UnitTests/UnitTest_TreeControl/TreeControl.cpp:293–387

	}

	void TreeControl::validate()
	{
		using PairNodeEnumeration = std::pair<VectorNodePtr::iterator, VectorNodePtr::iterator>;
		using ListNodeEnumeration = std::list<PairNodeEnumeration>;
		ListNodeEnumeration EnumerationStack;
		PairNodeEnumeration Enumeration;
		VectorNodePtr vectorNodePtr;
		if (mbRootVisible)
		{
			vectorNodePtr.push_back(mpRoot);
			Enumeration = PairNodeEnumeration(vectorNodePtr.begin(), vectorNodePtr.end());
		}
		else
			Enumeration = PairNodeEnumeration(mpRoot->getChildren().begin(), mpRoot->getChildren().end());

		size_t nLevel = 0;
		size_t nIndex = 0;
		size_t nItem = 0;
		int nOffset = 0 - mnTopOffset;

		while (true)
		{
			if (Enumeration.first == Enumeration.second)
			{
				if (EnumerationStack.empty())
					break;

				Enumeration = EnumerationStack.back();
				EnumerationStack.pop_back();
				nLevel--;
				continue;
			}

			Node* pNode = *Enumeration.first;
			Enumeration.first++;

			if (nIndex >= (size_t)mnTopIndex)
			{
				// FIXME проверка вставлена так как падает индекс айтема больше чем всего айтемов
				if (nItem >= mItemWidgets.size())
					break;

				if (nIndex >= mnExpandedNodes || mItemWidgets[nItem]->getTop() > getClientWidget()->getHeight())
					break;

				TreeControlItem* pItem = mItemWidgets[nItem];
				pItem->setVisible(true);
				pItem->setCaption(pNode->getText());
				pItem->setPosition(IntPoint(nLevel * mnLevelOffset, nOffset));
				pItem->setStateSelected(pNode == mpSelection);
				pItem->setUserData(pNode);

				Button* pButtonExpandCollapse = pItem->getButtonExpandCollapse();
				pButtonExpandCollapse->setVisible(pNode->hasChildren());
				pButtonExpandCollapse->setStateSelected(!pNode->isExpanded());

				ImageBox* pIcon = pItem->getIcon();
				if (pIcon)