added login failed message (remains register message); installed flood_control contrib module

web/modules/custom/materio_user/materio_user.module

@@ -15,15 +15,15 @@ use \Drupal\Core\Link;
  *
  */
 function materio_user_form_user_login_form_alter(&$form, FormStateInterface $form_state, $form_id) {
-  // Drupal::logger('materio_user')->notice(print_r($form, true));
+
   $form['name']['#attributes'] += array(
     "v-model" => "mail",
-    "@keyup.enter" => "login"
+    // "@keyup.enter" => "login"
   );
 
   $form['pass']['#attributes'] = array(
     "v-model" => "password",
-    "@keyup.enter" => "login"
+    // "@keyup.enter" => "login"
   );
 
   $url = Url::fromRoute('user.pass');
@@ -34,6 +34,14 @@ function materio_user_form_user_login_form_alter(&$form, FormStateInterface $for
     "@click.prevent" => "login"
   );
 
+  $form['message'] = array(
+    '#markup' => '
+      <span class="login-message" v-if="loginMessage">
+        {{ loginMessage }}
+      </span>
+    '
+  );
+
 }
 
 function materio_user_form_user_modal_form_alter(&$form, FormStateInterface $form_state, $form_id) {