Issue #3311791 by pivica: Prevent sidebar dropdown hiding only for menu items

  });

  $(document).on('hide.bs.dropdown', function (e) {

    // Don't hide dropdown which is in sidebar navigation. This will prevent

    // hiding open submenus in sidebar navigation.

    if (Drupal.bs_bootstrap.navbar.isNavbarCollapseShow($(e.target))) {

    // Don't hide dropdown navigation menus which are in sidebar navigation.

    // This will prevent hiding open submenus in sidebar navigation when we want

    // to open a new sub navigation - the rest will stay open.

    if (e.target.classList.contains('nav-item') && Drupal.bs_bootstrap.navbar.isNavbarCollapseShow($(e.target))) {

      e.preventDefault();

    }

  });