Initial Drupal 11 with DDEV setup

web/core/themes/olivero/src/OliveroPreRender.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\olivero;
+
+use Drupal\Core\Security\TrustedCallbackInterface;
+
+/**
+ * Implements trusted prerender callbacks for the Olivero theme.
+ *
+ * @internal
+ */
+class OliveroPreRender implements TrustedCallbackInterface {
+
+  /**
+   * Prerender callback for text_format elements.
+   */
+  public static function textFormat($element) {
+    $element['format']['#attributes']['class'][] = 'filter-wrapper';
+    $element['format']['format']['#wrapper_attributes']['class'][] = 'form-item--editor-format';
+    $element['format']['format']['#attributes']['class'][] = 'filter-list';
+    $element['format']['format']['#attributes']['class'][] = 'form-element--small';
+    $element['format']['format']['#attributes']['class'][] = 'form-element--editor-format';
+    $element['format']['guidelines']['#attributes']['class'][] = 'filter-guidelines';
+    $element['format']['help']['#attributes']['class'][] = 'filter-help';
+    return $element;
+  }
+
+  /**
+   * Prerender callback for status_messages placeholder.
+   *
+   * @param array $element
+   *   A renderable array.
+   *
+   * @return array
+   *   The updated renderable array containing the placeholder.
+   */
+  public static function messagePlaceholder(array $element) {
+    if (isset($element['fallback']['#markup'])) {
+      $element['fallback']['#markup'] = '<div data-drupal-messages-fallback class="hidden messages-list"></div>';
+    }
+    return $element;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function trustedCallbacks() {
+    return [
+      'textFormat',
+      'messagePlaceholder',
+    ];
+  }
+
+}