remove-anonymous-session.patch

diff --git a/src/ActionLink/ActionLinkTypeBase.php b/src/ActionLink/ActionLinkTypeBase.php
index a14e37e..bc2a154 100644
--- a/src/ActionLink/ActionLinkTypeBase.php
+++ b/src/ActionLink/ActionLinkTypeBase.php
@@ -11,6 +11,7 @@ use Drupal\Core\Cache\CacheableMetadata;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Session\SessionManagerInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\flag\FlagInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -31,6 +32,13 @@ abstract class ActionLinkTypeBase extends PluginBase implements ActionLinkTypePl
    */
   protected $currentUser;
 
+  /**
+   * The session manager.
+   *
+   * @var \Drupal\Core\Session\SessionManagerInterface $sessionManager
+   */
+  protected $sessionManager;
+
   use StringTranslationTrait;
   use RedirectDestinationTrait;
 
@@ -45,11 +53,14 @@ abstract class ActionLinkTypeBase extends PluginBase implements ActionLinkTypePl
    *   The plugin definition array.
    * @param \Drupal\Core\Session\AccountInterface $current_user
    *   The current user.
+   * @param \Drupal\Core\Session\SessionManagerInterface $session_manager
+   *   The session manager.
    */
-  public function __construct(array $configuration, $plugin_id, array $plugin_definition, AccountInterface $current_user) {
+  public function __construct(array $configuration, $plugin_id, array $plugin_definition, AccountInterface $current_user, SessionManagerInterface $session_manager) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
     $this->configuration += $this->defaultConfiguration();
     $this->currentUser = $current_user;
+    $this->sessionManager = $session_manager;
   }
 
   /**
@@ -60,7 +71,8 @@ abstract class ActionLinkTypeBase extends PluginBase implements ActionLinkTypePl
       $configuration,
       $plugin_id,
       $plugin_definition,
-      $container->get('current_user')
+      $container->get('current_user'),
+      $container->get('session_manager')
     );
   }
 
@@ -144,7 +156,14 @@ abstract class ActionLinkTypeBase extends PluginBase implements ActionLinkTypePl
    * @return string
    */
   protected function getAction(FlagInterface $flag, EntityInterface $entity) {
+    // If an anonymous user does not have a session, that user has not yet
+    // flagged anything, so the action is "flag".
+    if ($this->currentUser->isAnonymous() && !$this->sessionManager->isStarted()) {
+      return 'flag';
+    }
+
     return $flag->isFlagged($entity) ? 'unflag' : 'flag';
+
   }
 
   /**