anchor.diff:      <div data-hook="admin_shipping_method_form_code" class="col-md-4">
         <%= f.field_container :code, :class => ['form-group'] do %>
           <%= f.label :code, Spree.t(:code) %>
  -        <%= f.text_field :code, :class => 'form-control', :label => false  %>
  +        <%= f.text_field :code, :class => 'form-control', :label => false %>
           <%= error_message_on :shipping_method, :code %>
         <% end %>
       </div>
  
positive.code: 
        <div class="panel-body">
          <%= f.field_container :categories, :class => ['form-group'] do %>
            <%= f.select :tax_category_id, @tax_categories.map { |tc| [tc.name, tc.id] }, {include_blank: true}, class: "select2" %>
            <%= error_message_on :shipping_method, :tax_category_id %>
          <% end %>
        </div>
  
negative.code:     <div data-hook="admin_shipping_method_form_display_field" class="col-md-6">
        <%= f.field_container :display_on, :class => ['form-group'] do %>
          <%= f.label :display_on, Spree.t(:display) %>
          <%= select(:shipping_method, :display_on, Spree::ShippingMethod::DISPLAY.collect { |display| [Spree.t(display), display == :both ? nil : display.to_s] }, {}, { :class => 'select2' }) %>
          <%= error_message_on :shipping_method, :display_on %>
        <% end %>
      </div>
  