Merge remote-tracking branch 'magento-l3/ACP2E-74' into L3_PR_21-10-19

Author: veloraven

app/code/Magento/Quote/Model/Quote/Item/CartItemPersister.php

@@ -75,7 +75,9 @@ public function save(CartInterface $quote, CartItemInterface $item)
                 $buyRequestData = $this->cartItemOptionProcessor->getBuyRequest($productType, $item);
                 if (is_object($buyRequestData)) {
                     /** Update item product options */
-                    $item = $quote->updateItem($itemId, $buyRequestData);
+                    if ($currentItem->getQty() !== $buyRequestData->getQty()) {
+                        $item = $quote->updateItem($itemId, $buyRequestData);
+                    }
                 } else {
                     if ($item->getQty() !== $currentItem->getQty()) {
                         $currentItem->clearMessage();