Issue #3422141: use valid URI for active handler view field rendering

Closes #3422141

src/Plugin/views/field/MaestroEngineActiveHandler.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\maestro\Plugin\views\field;
 
+use Drupal\Component\Utility\UrlHelper;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\maestro\Utility\TaskHandler;
 use Drupal\views\Plugin\views\field\FieldPluginBase;
@@ -84,10 +85,11 @@ class MaestroEngineActiveHandler extends FieldPluginBase {
       $taskhandler = TaskHandler::getHandlerURL($queueID);
 
       if (isset($this->options['show_as_link']) && $this->options['show_as_link'] == 1) {
+        $uri = UrlHelper::isExternal($taskhandler) ? $taskhandler : 'internal:' . $taskhandler;
         $build['handler'][$queueID]['execute'] = [
           '#type' => 'link',
           '#title' => isset($this->options['link_text']) ? $this->options['link_text'] : $this->t('Link'),
-          '#url' => Url::fromUri($taskhandler),
+          '#url' => Url::fromUri($uri),
         ];
       }
       else {