Michael Strelan
--- a/core/modules/views/src/Plugin/ViewsHandlerManager.php
+++ b/core/modules/views/src/Plugin/ViewsHandlerManager.php
   *   The module handler to invoke the alter hook with.
   */
  public function __construct($handler_type, \Traversable $namespaces, ViewsData $views_data, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
+    $plugin_definition_attribute_name = 'Drupal\views\Attribute\Views' . Container::camelize($handler_type);