ViewEditForm::submitDisplayAdd

public ViewEditForm::submitDisplayAdd($form, FormStateInterface $form_state)

public function submitDisplayAdd($form, FormStateInterface $form_state) {
  $view = $this->entity;
  // Create the new display.
  $parents = $form_state->getTriggeringElement()['#parents'];
  $display_type = array_pop($parents);
  $display = $view->getExecutable()->newDisplay($display_type);
  $display_id = $display->display['id'];
  // A new display got added so the asterisks symbol should appear on the new
  // display.
  $view->getExecutable()->current_display = $display_id;
  $view->cacheSet();

  // Redirect to the new display's edit page.
  $form_state->setRedirect('entity.view.edit_display_form', array(
    'view' => $view->id(),
    'display_id' => $display_id,
  ));
}