Issue #3419311 by bluegeek9: User Test Form: unable to see kint results

Closes #3419311

ldap_user/src/Form/LdapUserTestForm.php

@@ -7,7 +7,6 @@ namespace Drupal\ldap_user\Form;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Url;
 use Drupal\externalauth\Authmap;
 use Drupal\ldap_servers\LdapUserAttributesInterface;
 use Drupal\ldap_servers\LdapUserManager;
@@ -157,6 +156,17 @@ final class LdapUserTestForm extends FormBase implements LdapUserAttributesInter
       '#weight' => 100,
     ];
 
+    if ($form_state->has('ldap_user_test_data')) {
+      $test_data = $form_state->get('ldap_user_test_data');
+      $form['test_data'] = [
+        '#type' => 'textarea',
+        '#title' => $this->t('Test Results'),
+        '#rows' => 20,
+        '#default_value' => \json_encode($test_data, JSON_PRETTY_PRINT),
+        '#weight' => 200,
+      ];
+    }
+
     return $form;
   }
 
@@ -228,20 +238,8 @@ final class LdapUserTestForm extends FormBase implements LdapUserAttributesInter
       }
     }
 
-    if (\function_exists('kint')) {
-      // @phpcs:ignore
-      kint($results);
-    }
-    else {
-      $this->messenger()
-        ->addWarning($this->t('This form will not display results unless the devel and kint module is enabled.'));
-    }
-
-    $params = [
-      'action' => $selected_action,
-      'username' => $username,
-    ];
-    $form_state->setRedirectUrl(Url::fromRoute('ldap_user.test_form', $params));
+    $form_state->set('ldap_user_test_data', $results);
+    $form_state->setRebuild();
   }
 
   /**