ProductQty.php

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<?php
namespace Magento\CatalogInventory\Observer;

use Magento\Quote\Model\Quote\Item as QuoteItem;

class ProductQty
{
    public function getProductQty($relatedItems)
    {
        $items = [];
        foreach ($relatedItems as $item) {
            $productId = $item->getProductId();
            if (!$productId) {
                continue;
            }
            $children = $item->getChildrenItems();
            if ($children) {
                foreach ($children as $childItem) {
                    $this->_addItemToQtyArray($childItem, $items);
                }
            } else {
                $this->_addItemToQtyArray($item, $items);
            }
        }
        return $items;
    }

    protected function _addItemToQtyArray(QuoteItem $quoteItem, &$items)
    {
        $productId = $quoteItem->getProductId();
        if (!$productId) {
            return;
        }
        if (isset($items[$productId])) {
            $items[$productId] += $quoteItem->getTotalQty();
        } else {
            $items[$productId] = $quoteItem->getTotalQty();
        }
    }
}