MC-38625: Storefront Order History product count is doubled if has more than 10 configurables

Author: Serhii Balko

app/code/Magento/Sales/Block/Order/Items.php

@@ -71,6 +71,7 @@ protected function _prepareLayout()
 
         $this->itemCollection = $this->itemCollectionFactory->create();
         $this->itemCollection->setOrderFilter($this->getOrder());
+        $this->itemCollection->addFieldToFilter('parent_item_id', ['null' => true]);
 
         /** @var \Magento\Theme\Block\Html\Pager $pagerBlock */
         $pagerBlock = $this->getChildBlock('sales_order_item_pager');