openproject/app/views/issues/_form_custom_fields.html.erb

<div class="splitcontentleft">
  <% i = 0 %>
  <% split_on = (@issue.custom_field_values.size / 2.0).ceil - 1 %>
  <% @issue.custom_field_values.each do |value| %>
    <p><%= custom_field_tag_with_label :issue, value %></p>
    <% if i == split_on -%>
      </div><div class="splitcontentright">
    <% end -%>
    <% i += 1 -%>
  <% end -%>
</div>
<div style="clear:both;"> </div>