namespace Drupal\system\Plugin\ImageToolkit;
use Drupal\Component\Utility\Color;
-use Drupal\Component\Utility\Unicode;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\ImageToolkit\ImageToolkitBase;
foreach (static::supportedTypes() as $image_type) {
// @todo Automatically fetch possible extensions for each mime type.
// @see https://www.drupal.org/node/2311679
- $extension = Unicode::strtolower(image_type_to_extension($image_type, FALSE));
+ $extension = mb_strtolower(image_type_to_extension($image_type, FALSE));
$extensions[] = $extension;
// Add some known similar extensions.
if ($extension === 'jpeg') {