MCP-584: Disable inventory check on quote load

- Enable Config option & remove validation for performance improvement

Author: aa-kashk

app/code/Magento/Quote/Model/Config.php

@@ -35,7 +35,6 @@ public function __construct(ScopeConfigInterface $config)
      */
     public function isEnabled(): bool
     {
-        //return (bool)$this->config->getValue(self::XML_PATH_INVENTORY_CHECK_ENABLED);
-        return false;
+        return (bool)$this->config->getValue(self::XML_PATH_INVENTORY_CHECK_ENABLED);
     }
 }

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

@@ -318,16 +318,16 @@ public function getStore()
     }
 
     /**
-     * Set and Validate Item Qty
+     * Checking item data
      *
-     * @return void
+     * @return $this
      */
-    public function setQuantity()
+    public function checkData()
     {
         $this->setHasError(false);
         $this->clearMessage();
-
         $qty = $this->_getData('qty');
+
         try {
             $this->setQty($qty);
         } catch (\Magento\Framework\Exception\LocalizedException $e) {
@@ -337,16 +337,7 @@ public function setQuantity()
             $this->setHasError(true);
             $this->setMessage(__('Item qty declaration error'));
         }
-    }
 
-    /**
-     * Checking item data
-     *
-     * @return $this
-     */
-    public function checkData()
-    {
-        $this->setQuantity();
         try {
             $this->getProduct()->getTypeInstance()->checkProductBuyState($this->getProduct());
         } catch (\Magento\Framework\Exception\LocalizedException $e) {

app/code/Magento/Quote/Model/ResourceModel/Quote/Item/Collection.php

@@ -293,8 +293,6 @@ protected function _assignProducts(): self
                 $item->setQtyOptions($qtyOptions)->setProduct($product);
                 if ($this->config->isEnabled()) {
                     $item->checkData();
-                } else {
-                    $item->setQuantity();
                 }
             }
         }