public FormCacheInterface::getCache($form_build_id, FormStateInterface $form_state)
Fetches a form from the cache.
string $form_build_id: The unique form build ID.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
public function getCache($form_build_id, FormStateInterface $form_state);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormCacheInterface.php/function/FormCacheInterface::getCache/8.1.x