ViewEditForm::save

public ViewEditForm::save(array $form, FormStateInterface $form_state)

public function save(array $form, FormStateInterface $form_state) {
  $view = $this->entity;
  $executable = $view->getExecutable();
  $executable->initDisplay();

  // Go through and remove displayed scheduled for removal.
  $displays = $view->get('display');
  foreach ($displays as $id => $display) {
    if (!empty($display['deleted'])) {
      $executable->displayHandlers->remove($id);
      unset($displays[$id]);
    }
  }

  // Rename display ids if needed.
  foreach ($executable->displayHandlers as $id => $display) {
    if (!empty($display->display['new_id']) && empty($display->display['deleted'])) {
      $new_id = $display->display['new_id'];
      $display->display['id'] = $new_id;
      unset($display->display['new_id']);
      $executable->displayHandlers->set($new_id, $display);

      $displays[$new_id] = $displays[$id];
      unset($displays[$id]);

      // Redirect the user to the renamed display to be sure that the page itself exists and doesn't throw errors.
      $form_state->setRedirect('entity.view.edit_display_form', array(
        'view' => $view->id(),
        'display_id' => $new_id,
      ));
    }
  }
  $view->set('display', $displays);

  // @todo: Revisit this when https://www.drupal.org/node/1668866 is in.
  $query = $this->requestStack->getCurrentRequest()->query;
  $destination = $query->get('destination');

  if (!empty($destination)) {
    // Find out the first display which has a changed path and redirect to this url.
    $old_view = Views::getView($view->id());
    $old_view->initDisplay();
    foreach ($old_view->displayHandlers as $id => $display) {
      // Only check for displays with a path.
      $old_path = $display->getOption('path');
      if (empty($old_path)) {
        continue;
      }

      if (($display->getPluginId() == 'page') && ($old_path == $destination) && ($old_path != $view->getExecutable()->displayHandlers->get($id)->getOption('path'))) {
        $destination = $view->getExecutable()->displayHandlers->get($id)->getOption('path');
        $query->remove('destination');
      }
    }
    // @todo Use Url::fromPath() once https://www.drupal.org/node/2351379 is
    //   resolved.
    $form_state->setRedirectUrl(Url::fromUri("base:$destination"));
  }

  $view->save();

  drupal_set_message($this->t('The view %name has been saved.', array('%name' => $view->label())));

  // Remove this view from cache so we can edit it properly.
  $this->tempStore->delete($view->id());
}