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