Implements \Drupal\Core\Form\FormInterface::submitForm().
Overrides SystemConfigFormBase::submitForm
public function submitForm(array &$form, array &$form_state) {
$this->configFactory
->get('system.image')
->set('toolkit', $form_state['values']['image_toolkit'])
->save();
// Call the form submit handler for each of the toolkits.
// Get the toolkit settings forms.
foreach ($this->availableToolkits as $id => $toolkit) {
$toolkit
->settingsFormSubmit($form, $form_state);
}
parent::submitForm($form, $form_state);
}