Issue #3260219 by trackleft2, smustgrave, joegraduate, mikelutz: Allow...

Issue #3260219 by trackleft2, smustgrave, joegraduate, mikelutz: Allow migrating <none> <button> url special menu items and empty string

core/modules/menu_link_content/src/Plugin/migrate/process/LinkUri.php

@@ -93,9 +93,12 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
       if ($path == '<front>') {
         $path = '';
       }
-      elseif ($path == '<nolink>') {
+      elseif (empty($path) || in_array($path, ['<nolink>', '<none>'])) {
         return 'route:<nolink>';
       }
+      elseif ($path == '<button>') {
+        return 'route:<button>';
+      }
       $path = 'internal:/' . $path;
 
       // Convert entity URIs to the entity scheme, if the path matches a route

core/modules/menu_link_content/tests/src/Kernel/Plugin/migrate/process/LinkUriTest.php

@@ -73,10 +73,22 @@ public static function providerTestRouted() {
     $expected = 'internal:/';
     $tests['front'] = [$value, $expected];
 
+    $value = '';
+    $expected = 'route:<nolink>';
+    $tests['empty'] = [$value, $expected];
+
+    $value = '<none>';
+    $expected = 'route:<nolink>';
+    $tests['none'] = [$value, $expected];
+
     $value = '<nolink>';
     $expected = 'route:<nolink>';
     $tests['nolink'] = [$value, $expected];
 
+    $value = '<button>';
+    $expected = 'route:<button>';
+    $tests['button'] = [$value, $expected];
+
     return $tests;
   }