anchor.diff:      li.pgn__item.interval.dropdown
         - delete(params.page)
         a.pgn__link.dropdown-toggle(
  -        href=self.link_to(route, params),
  -        data-target="#", data-toggle='dropdown') ...
  +        href=self.link_to(route, params)
  +        data-target="#"
  +        data-toggle='dropdown') ...
         mixin _pagination_dropdown_menu(route, params)
   
     //- last page always displayed, except it's current one
  
positive.code:       input.form-control(
          id=pgmpid
          name="page"
          size='8'
          type='number'
          min='1',
          max=max
          value = current
          placeholder=self.t('dropdown_placeholder')
        )
        span.input-group-btn
  
negative.code:     - params.page = current
      a.pgn__link.dropdown-toggle(
        href=self.link_to(route, params)
        data-target="#"
        data-toggle='dropdown'
      )= params.page
  
      mixin _pagination_dropdown_menu(route, params)
  