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

<strong><%= l(:label_issue_hierarchy) %></strong>
(<%= link_to(l(:label_add_subtask), {:controller => 'issues', :action => 'new', :project_id => @project, :issue => {:parent_issue_id => @issue}}) if User.current.allowed_to?(:manage_subtasks, @project) %>)

<% if !@issue.leaf? || @issue.parent %>
  <% indent = 0 %>

  <form action="#">
    <table id="issue_tree" class="list">

      <!-- render parent elements -->
      <% @issue.ancestors.each do |issue| %>
        <%= render :partial => 'subissue_row', :locals => { :issue => issue, :level => indent, :relation => "parent" } %>
        <% indent += 1 %>
      <% end %>

      <!-- render current element -->
      <%= render :partial => 'subissue_row', :locals => { :issue => @issue, :level => indent, :relation => "root" } %>
      <% indent += 1 %>

      <!-- render child elements -->
      <% issue_list(@issue.descendants.sort_by(&:lft)) do |issue, level| %>
        <%= render :partial => 'subissue_row', :locals => { :issue => issue, :level => indent + level, :relation => "child" } %>
      <% end %>

    </table>
  </form>
<% end %>