ISTWCMS-4635: Create UWDropbutton with access check

src/Plugin/views/field/UWDropbutton.php

+<?php
+
+namespace Drupal\uw_cfg_common\Plugin\views\field;
+
+use Drupal\views\Plugin\views\field\Dropbutton;
+use Drupal\views\ResultRow;
+
+/**
+ * Provides a handler that renders links as dropbutton with access check.
+ *
+ * Identical to parent class except that render() removes links for which the
+ * user has no access.
+ *
+ * @ingroup views_field_handlers
+ *
+ * @ViewsField("uwdropbutton")
+ */
+class UWDropbutton extends Dropbutton {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function render(ResultRow $values) {
+    $links = [];
+    foreach ($this->getLinks() as $link) {
+      if ($link['url']->access()) {
+        $links[] = $link;
+      }
+    }
+
+    if (!empty($links)) {
+      return [
+        '#type' => 'dropbutton',
+        '#links' => $links,
+      ];
+    }
+    else {
+      return '';
+    }
+  }
+
+}

uw_cfg_common.module

@@ -581,3 +581,11 @@ function uw_cfg_common_block_content_create_access(AccountInterface $account, ar
   // No opinion.
   return AccessResult::neutral();
 }
+
+/**
+ * Implements hook_views_plugins_field_alter().
+ */
+function uw_cfg_common_views_plugins_field_alter(array &$plugins): void {
+  // Replace Drupal\views\Plugin\views\field\Dropbutton with UW version.
+  $plugins['dropbutton']['class'] = 'Drupal\uw_cfg_common\Plugin\views\field\UWDropbutton';
+}