MAGETWO-98748: Incorrect behavior in the category menu on the Storefront

Author: VeronikaYarats

app/code/Magento/Catalog/Plugin/Block/Topmenu.php

@@ -14,11 +14,6 @@
  */
 class Topmenu
 {
-    /**
-     * Cache tag for menu block
-     */
-    private $cacheTag = "top_menu";
-
     /**
      * Catalog category
      *
@@ -124,7 +119,6 @@ public function beforeGetIdentities(\Magento\Theme\Block\Html\Topmenu $subject)
         $subject->addIdentity(Category::CACHE_TAG);
         $rootId = $this->storeManager->getStore()->getRootCategoryId();
         $storeId = $this->storeManager->getStore()->getId();
-        $currentCategory = $this->getCurrentCategory();
         /** @var \Magento\Catalog\Model\ResourceModel\Category\Collection $collection */
         $collection = $this->getCategoryTree($storeId, $rootId);
         $mapping = [$rootId => $subject->getMenu()];  // use nodes stack to avoid recursion
@@ -134,9 +128,6 @@ public function beforeGetIdentities(\Magento\Theme\Block\Html\Topmenu $subject)
             }
             $subject->addIdentity(Category::CACHE_TAG . '_' . $category->getId());
         }
-        if ($currentCategory) {
-            $subject->addIdentity($this->cacheTag . '_' . Category::CACHE_TAG . '_' . $currentCategory->getId());
-        }
     }
 
     /**

app/code/Magento/Catalog/Test/Mftf/Section/AdminCategorySidebarTreeSection.xml

@@ -13,8 +13,6 @@
         <element name="expandAll" type="button" selector=".tree-actions a:last-child"/>
         <element name="categoryTreeRoot" type="text" selector="div.x-tree-root-node>li.x-tree-node:first-of-type>div.x-tree-node-el:first-of-type" timeout="30"/>
         <element name="categoryInTree" type="text" selector="//a/span[contains(text(), '{{name}}')]" parameterized="true" timeout="30"/>
-        <element name="categoryHighlighted" type="text" selector="//ul[@id='ui-id-2']//li//a/span[contains(text(),'{{name}}')]/../.." parameterized="true" timeout="30"/>
-        <element name="categoryNotHighlighted" type="text" selector="ul[id=\'ui-id-2\'] li[class~=\'active\']" timeout="30"/>
         <element name="categoryInTreeUnderRoot" type="text" selector="//li/ul/li[@class='x-tree-node']/div/a/span[contains(text(), '{{name}}')]" parameterized="true"/>
         <element name="lastCreatedCategory" type="block" selector=".x-tree-root-ct li li:last-child" />
         <element name="treeContainer" type="block" selector=".tree-holder" />

app/code/Magento/Catalog/Test/Mftf/Test/CheckCurrentCategoryIsHighlightedAndProductsDisplayed.xml

@@ -74,16 +74,6 @@ protected function getCacheLifetime()
         return parent::getCacheLifetime() ?: 3600;
     }
 
-    /**
-     * Get cache key informative items
-     *
-     * @return array
-     */
-    public function getCacheKeyInfo()
-    {
-        return array_merge(parent::getCacheKeyInfo(), $this->getIdentities());
-    }
-
     /**
      * Get top menu html
      *