Implements \Drupal\aggregator\Plugin\ProcessorInterface::settingsSubmit().
Overrides ProcessorInterface::settingsSubmit
public function settingsSubmit(array $form, array &$form_state) {
$config = config('aggregator.settings');
$config
->set('items.expire', $form_state['values']['aggregator_clear'])
->set('items.teaser_length', $form_state['values']['aggregator_teaser_length'])
->set('source.list_max', $form_state['values']['aggregator_summary_items'])
->set('source.category_selector', $form_state['values']['aggregator_category_selector'])
->save();
}