Issue #3276056 by glassb, eregeur: Fix URL encoding for special characters

use Drupal\Core\Form\FormStateInterface;

use Drupal\Core\Plugin\ContainerFactoryPluginInterface;

use Drupal\Core\Url;

use Drupal\Component\Utility\Html;

use Drupal\Component\Utility\UrlHelper;

use Symfony\Cmf\Component\Routing\RouteObjectInterface;

use Symfony\Component\DependencyInjection\ContainerInterface;

    $items['page_url'] = Url::fromRoute('<current>', [], ['absolute' => TRUE]);

    $items['description'] = '';

    $items['title'] = Html::escape($title);

    $items['title'] = UrlHelper::encodePath($title);

    $items['width'] = $this->configuration['width'] ?? $config->get('width');

    $items['radius'] = $this->configuration['radius'] ?? $config->get('radius');

    $items['facebook_app_id'] = $this->configuration['facebook_app_id'] ?? $config->get('facebook_app_id');