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Expanded class hierarchy of WidgetInterface in Drupal 9

interface \Drupal\Component\Plugin\PluginInspectionInterface; interface \Drupal\Core\Config\Entity\ThirdPartySettingsInterface
- interface \Drupal\Core\Field\PluginSettingsInterface
  - interface \Drupal\Core\Field\FormatterInterface
  - interface \Drupal\Core\Field\WidgetBaseInterface
    interface \Drupal\Core\Field\WidgetInterface
    interface \Drupal\simplenews\SubscriptionWidgetInterface