ACP2E-2842: Switching to single store mode - global content no longer appears

Author: bubasuma

app/code/Magento/Theme/Observer/MoveStoreLevelDesignConfigToWebsiteScopeOnSingleStoreMode.php

@@ -0,0 +1,69 @@
+<?php
+/************************************************************************
+ *
+ * Copyright 2024 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
+ * ************************************************************************
+ */
+declare(strict_types=1);
+
+namespace Magento\Theme\Observer;
+
+use Magento\Framework\App\Config\ScopeConfigInterface;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\Event\ObserverInterface;
+use Magento\Store\Model\ScopeInterface;
+use Magento\Store\Model\StoreManager;
+use Magento\Store\Model\StoreManagerInterface;
+use Magento\Theme\Api\DesignConfigRepositoryInterface;
+
+class MoveStoreLevelDesignConfigToWebsiteScopeOnSingleStoreMode implements ObserverInterface
+{
+    /**
+     * @param ScopeConfigInterface $scopeConfig
+     * @param DesignConfigRepositoryInterface $designConfigRepository
+     * @param StoreManagerInterface $storeManager
+     */
+    public function __construct(
+        private readonly ScopeConfigInterface $scopeConfig,
+        private readonly DesignConfigRepositoryInterface $designConfigRepository,
+        private readonly StoreManagerInterface $storeManager
+    ) {
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function execute(Observer $observer)
+    {
+        $changedPaths = (array)$observer->getEvent()->getChangedPaths();
+        if (in_array(StoreManager::XML_PATH_SINGLE_STORE_MODE_ENABLED, $changedPaths, true)
+            && $this->scopeConfig->getValue(StoreManager::XML_PATH_SINGLE_STORE_MODE_ENABLED)
+        ) {
+            $store = $this->storeManager->getDefaultStoreView();
+            if ($store) {
+                $websiteId = $store->getWebsiteId();
+                $storeId = $store->getId();
+                $designConfig = $this->designConfigRepository->getByScope(ScopeInterface::SCOPE_STORES, $storeId);
+                // Copy design config from store scope to website scope
+                $designConfig->setScope(ScopeInterface::SCOPE_WEBSITES);
+                $designConfig->setScopeId($websiteId);
+                $this->designConfigRepository->save($designConfig);
+                // At this point store design config the same as website design config.
+                // By saving store design config, we will preserve inheritance from website scope.
+                $designConfig->setScope(ScopeInterface::SCOPE_STORES);
+                $designConfig->setScopeId($storeId);
+                $this->designConfigRepository->save($designConfig);
+            }
+        }
+    }
+}

app/code/Magento/Theme/etc/events.xml

@@ -12,4 +12,7 @@
     <event name="theme_save_after">
         <observer name="check_theme_is_assigned" instance="Magento\Theme\Observer\CheckThemeIsAssignedObserver" />
     </event>
+    <event name="admin_system_config_changed_section_general">
+        <observer name="move_store_level_design_config_to_website_scope_on_single_store_mode" instance="Magento\Theme\Observer\MoveStoreLevelDesignConfigToWebsiteScopeOnSingleStoreMode" />
+    </event>
 </config>