MAGETWO-34740: Quote is_virtual flag not set after virtual product added to cart

Author: nsyvokonenko

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

@@ -27,7 +27,6 @@
  *  sales_quote_delete_after
  *
  * @method Quote setStoreId(int $value)
- * @method Quote setIsVirtual(int $value)
  * @method int getIsMultiShipping()
  * @method Quote setIsMultiShipping(int $value)
  * @method float getStoreToBaseRate()
@@ -556,6 +555,14 @@ public function setIsActive($isActive)
         return $this->setData(self::KEY_IS_ACTIVE, $isActive);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function setIsVirtual($isVirtual)
+    {
+        return $this->setData(self::KEY_IS_VIRTUAL, $isVirtual);
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -772,6 +779,9 @@ public function beforeSave()
             $this->setCustomerId($this->_customer->getId());
         }
 
+        //mark quote if it has virtual products only
+        $this->setIsVirtual($this->getIsVirtual());
+
         parent::beforeSave();
     }