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 %>
            <% Spree::ShippingCategory.all.each do |category| %>
              <%= label_tag do %>
                <%= check_box_tag('shipping_method[shipping_categories][]', category.id, @shipping_method.shipping_categories.include?(category)) %>
                <%= category.name %>
              <% end %>
            <% end %>
            <%= error_message_on :shipping_method, :shipping_category_id %>
          <% end %>
  
negative.code:     <div data-hook="admin_shipping_method_form_internal_name_field" class="col-md-4">
        <%= f.field_container :admin_name, :class => ['form-group'] do %>
          <%= f.label :admin_name, Spree.t(:internal_name) %>
          <%= f.text_field :admin_name, :class => 'form-control', :label => false %>
          <%= error_message_on :shipping_method, :admin_name %>
        <% end %>
      </div>
  