public FormSubmitterInterface::doSubmitForm(&$form, FormStateInterface &$form_state)
Handles the submitted form, executing callbacks and processing responses.
array $form: An associative array containing the structure of the form.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
null|\Symfony\Component\HttpFoundation\Response If a response was set by a submit handler, or if the form needs to redirect, a Response object will be returned.
public function doSubmitForm(&$form, FormStateInterface &$form_state);
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