ENGCOM-8030: Prevent side effect on category objects store_id and url…

…_key on save #28164

 - Merge Pull Request #28164 from schmengler/magento2:url-rewrite-side-effect
 - Merged commits:
   1. 7bd5e25
   2. 8bcd2fa
   3. 87c5c60
   4. 31c5963
   5. c051134
   6. 6083a7c

app/code/Magento/CatalogUrlRewrite/Model/CategoryUrlRewriteGenerator.php

@@ -54,6 +54,11 @@ class CategoryUrlRewriteGenerator
      */
     private $mergeDataProviderPrototype;
 
+    /**
+     * @var CategoryRepositoryInterface
+     */
+    private $categoryRepository;
+
     /**
      * @var bool
      */
@@ -124,10 +129,11 @@ protected function generateForGlobalScope(
         $mergeDataProvider = clone $this->mergeDataProviderPrototype;
         $categoryId = $category->getId();
         foreach ($category->getStoreIds() as $storeId) {
-            $category->setStoreId($storeId);
             if (!$this->isGlobalScope($storeId)
                 && $this->isOverrideUrlsForStore($storeId, $categoryId, $overrideStoreUrls)
             ) {
+                $category = clone $category; // prevent undesired side effects on original object
+                $category->setStoreId($storeId);
                 $this->updateCategoryUrlForStore($storeId, $category);
                 $mergeDataProvider->merge($this->generateForSpecificStoreView($storeId, $category, $rootCategoryId));
             }

app/code/Magento/CatalogUrlRewrite/Test/Unit/Model/CategoryUrlRewriteGeneratorTest.php

@@ -158,6 +158,7 @@ public function testGenerationForGlobalScope()
             ],
             $this->categoryUrlRewriteGenerator->generate($this->category, false, $categoryId)
         );
+        $this->assertEquals(0, $this->category->getStoreId(), 'Store ID should not have been modified');
     }
 
     /**