Display Wrong Data On Cart Update Page

Author: VladimirZaets

app/code/Magento/Catalog/view/frontend/templates/product/view/form.phtml

@@ -22,7 +22,7 @@
         <input type="hidden" name="product" value="<?= /* @escapeNotVerified */ $_product->getId() ?>" />
         <input type="hidden" name="selected_configurable_option" value="" />
         <input type="hidden" name="related_product" id="related-products-field" value="" />
-        <input type="hidden" name="item"  value="<?= $block->getRequest()->getParam('id') ?>" />
+        <input type="hidden" name="item"  value="<?= /* @noEscape */ $block->getRequest()->getParam('id') ?>" />
         <?= $block->getBlockHtml('formkey') ?>
         <?= $block->getChildHtml('form_top') ?>
         <?php if (!$block->hasOptions()):?>

app/code/Magento/Checkout/view/frontend/web/js/view/configure/product-customer-data.js

@@ -42,7 +42,7 @@ require([
             return;
         }
         product = data.items.find(function (item) {
-            if (item['item_id'] == itemId) {
+            if (item['item_id'] === itemId) {
                 return item['product_id'] === productId ||
                     item['item_id'] === productId;
             }

app/code/Magento/ConfigurableProduct/view/frontend/web/js/options-updater.js

@@ -8,11 +8,11 @@ define([
     var selectors = {
         formSelector: '#product_addtocart_form',
         productIdSelector: '#product_addtocart_form [name="product"]',
-        itemIdSelector:'#product_addtocart_form [name="item"]'
+        itemIdSelector: '#product_addtocart_form [name="item"]'
     },
     cartData = customerData.get('cart'),
     productId = $(selectors.productIdSelector).val(),
-    itemId= $(selectors.itemIdSelector).val(),
+    itemId = $(selectors.itemIdSelector).val(),
 
     /**
     * set productOptions according to cart data from customer-data
@@ -27,7 +27,7 @@ define([
             return false;
         }
         changedProductOptions = data.items.find(function (item) {
-            if (item['item_id'] == itemId) {
+            if (item['item_id'] === itemId) {
                 return item['product_id'] === productId;
             }
         });