Issue #3430868: Automated Drupal 11 compatibility fixes for guidelines

guidelines.module

@@ -142,7 +142,7 @@ function guidelines_attach_to_widget(&$element, FormStateInterface &$form_state,
   if (isset($descriptions[$entity_type][$key])) {
     $view_builder = \Drupal::entityTypeManager()->getViewBuilder('guideline');
     $pre_render = $view_builder->view($descriptions[$entity_type][$key], 'default');
-    $render_output = render($pre_render);
+    $render_output = \Drupal::service('renderer')->render($pre_render);
 
     if (isset($element['#description'])) {
       $element['#description'] = $render_output;

src/Controller/GuidelineJsonController.php

@@ -64,7 +64,7 @@ class GuidelineJsonController extends ControllerBase {
         if (!empty($bundle) && $bundle === $b) {
           $view_builder = $this->entityTypeManager()->getViewBuilder('guideline');
           $pre_render = $view_builder->view($guideline, 'default');
-          $render_output = render($pre_render);
+          $render_output = \Drupal::service('renderer')->render($pre_render);
 
           if (!empty($guideline->field_title->value)) {
             $title = $guideline->field_title->value;