QuoteItemQtyList.php

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<?php
namespace Magento\CatalogInventory\Model\Quote\Item\QuantityValidator;

class QuoteItemQtyList
{
    protected $_checkedQuoteItems = [];

    public function getQty($productId, $quoteItemId, $quoteId, $itemQty)
    {
        $qty = $itemQty;
        if (isset(
            $this->_checkedQuoteItems[$quoteId][$productId]['qty']
        ) && !in_array(
            $quoteItemId,
            $this->_checkedQuoteItems[$quoteId][$productId]['items']
        )
        ) {
            $qty += $this->_checkedQuoteItems[$quoteId][$productId]['qty'];
        }

        $this->_checkedQuoteItems[$quoteId][$productId]['qty'] = $qty;
        $this->_checkedQuoteItems[$quoteId][$productId]['items'][] = $quoteItemId;

        return $qty;
    }
}