Creates a new display and a display handler for it.
string $plugin_id: (optional) The plugin type from the Views plugin annotation. Defaults to 'page'.
string $title: (optional) The title of the display. Defaults to NULL.
string $id: (optional) The ID to use, e.g., 'default', 'page_1', 'block_2'. Defaults to NULL.
Drupal\views\Plugin\views\display\DisplayPluginBase A reference to the new handler object.
public function &newDisplay($plugin_id = 'page', $title = NULL, $id = NULL) {
$id = $this
->addDisplay($plugin_id, $title, $id);
return $this
->get('executable')
->newDisplay($id);
}