Issue #3367611: Support Layout Builder on menu item

src/Controller/MenuLinksController.php

@@ -108,6 +108,7 @@ public function exportMenuLinks(array $form = NULL, FormStateInterface $form_sta
         'langcode' => $menuLink->langcode->value,
         'uuid' => $menuLink->uuid(),
         'options' => $menuLink->link->options,
+        'layout_builder__layout' => serialize($menuLink->layout_builder__layout),
       ];
 
       StructureSyncHelper::logMessage('Exported "' . $menuLink->title->value . '" of menu "' . $menuLink->menu_name->value . '"');
@@ -392,6 +393,7 @@ public static function importMenuLinksFull($menus, &$context) {
               'weight' => $menuLink['weight'],
               'langcode' => $menuLink['langcode'],
               'uuid' => $menuLink['uuid'],
+              'layout_builder__layout' => isset($menuLink['layout_builder__layout']) ? unserialize($menuLink['layout_builder__layout']) : '',
             ])->save();
           }
           else {
@@ -411,6 +413,7 @@ public static function importMenuLinksFull($menus, &$context) {
                     ->set('parent', $menuLink['parent'])
                     ->set('description', $menuLink['description'])
                     ->set('weight', $menuLink['weight'])
+                    ->set('layout_builder__layout', isset($menuLink['layout_builder__layout']) ? unserialize($menuLink['layout_builder__layout']) : '')
                     ->save();
                 }
 
@@ -477,6 +480,7 @@ public static function importMenuLinksSafe($menus, &$context) {
         'weight' => $menuLink['weight'],
         'langcode' => $menuLink['langcode'],
         'uuid' => $menuLink['uuid'],
+        'layout_builder__layout' => isset($menuLink['layout_builder__layout']) ? unserialize($menuLink['layout_builder__layout']) : '',
       ])->save();
 
       StructureSyncHelper::logMessage('Imported "' . $menuLink['title'] . '" into "' . $menuLink['menu_name'] . '" menu');
@@ -520,6 +524,7 @@ public static function importMenuLinksForce($menus, &$context) {
         'weight' => $menuLink['weight'],
         'langcode' => $menuLink['langcode'],
         'uuid' => $menuLink['uuid'],
+        'layout_builder__layout' => isset($menuLink['layout_builder__layout']) ? unserialize($menuLink['layout_builder__layout']) : '',
       ])->save();
 
       StructureSyncHelper::logMessage('Imported "' . $menuLink['title'] . '" into "' . $menuLink['menu_name'] . '" menu');