MAGETWO-3233: Clone - Configurable product doesn't go Out of stock with FPC enabled if customer buy the last associated product

Author: Egor Shitikov

app/code/Magento/Catalog/Helper/Product.php

@@ -185,15 +185,13 @@ public function  isDataForPriceIndexerWasChanged($data)
      * @param \Magento\Catalog\Model\Product $data
      * @return boolean
      */
-    public function isDataForProductCategoryIndexerWasChanged($data)
+    public function isDataForProductCategoryIndexerWasChanged(\Magento\Catalog\Model\Product $data)
     {
-        if ($data instanceof ModelProduct) {
             foreach ($this->_reindexProductCategoryIndexerData['byDataChange'] as $param) {
                 if ($data->dataHasChangedFor($param)) {
                     return true;
                 }
             }
-        }
         return false;
     }
 

app/code/Magento/Catalog/Model/Category.php

@@ -1026,7 +1026,7 @@ public function reindex()
         }
         $affectedProductIds = $this->getAffectedProductIds();
         $productIndexer = $this->indexerRegistry->get(Indexer\Category\Product::INDEXER_ID);
-        if (!$productIndexer->isScheduled() && $affectedProductIds != null) {
+        if (!$productIndexer->isScheduled() && !empty($affectedProductIds)) {
             $productIndexer->reindexList($this->getPathIds());
         }
     }