Fixing the case when an error message appears twice

Author: rogyar

app/code/Magento/Quote/Model/Cart/AddProductsToCart.php

@@ -39,7 +39,7 @@ class AddProductsToCart
         'Could not find a product with SKU' => self::ERROR_PRODUCT_NOT_FOUND,
         'The required options you selected are not available' => self::ERROR_NOT_SALABLE,
         'Product that you are trying to add is not available.' => self::ERROR_NOT_SALABLE,
-        'This product is out of stock' => self::ERROR_NOT_SALABLE,
+        'This product is out of stock' => self::ERROR_INSUFFICIENT_STOCK,
         'There are no source items' => self::ERROR_NOT_SALABLE,
         'The fewest you may purchase is' => self::ERROR_INSUFFICIENT_STOCK,
         'The most you may purchase is' => self::ERROR_INSUFFICIENT_STOCK,
@@ -153,6 +153,8 @@ private function addItemToCart(CartInterface $cart, Data\CartItem $cartItem, int
                 __($e->getMessage())->render(),
                 $cartItemPosition
             );
+            $cart->setHasError(false);
+
             return;
         }
 

app/code/Magento/QuoteGraphQl/etc/schema.graphqls

@@ -320,7 +320,7 @@ type SetGuestEmailOnCartOutput {
 }
 
 input EnteredOptionInput {
-    id: String! @doc(description: "base64 encoded option ID")
+    id: ID! @doc(description: "base64 encoded option ID")
     value: String!
 }