Used to redirect the form on submission.
This property is uncacheable.
Type: \Drupal\Core\Url|\Symfony\Component\HttpFoundation\RedirectResponse|null
self::getRedirect()
protected $redirect;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/property/FormState::redirect/8.1.x