anchor.diff:        <% else %>
             <input type="number"
                    name="exp_sum"
  -                 value="<%= @submission.exp %>"
  +                 value="<%= params[:exp_sum] || @submission.exp %>"
                    max="<%= @mission.exp %>"
                    class="input-small exp-input"
                    id="exp-sum"
  
positive.code:           <strong><%= @grading.total_grade %></strong>
        <% else %>
            <input type="number"
                   value="<%= @submission.grade %>"
                   max="<%= @mission.max_grade %>"
                   class="input-small"
                   name="grade_sum"
  
negative.code:             <% else %>
                <input type="number"
                       name="grades[<%= grade.id %>][grade]"
                       value="<%= (params[:grades][grade.id.to_s][:grade] if params[:grades]) || grade.grade %>"
                       class="input-small grade-input"
                       max="<%= q.max_grade %>"
                       id="grade-awarded-<%= grade.id %>"
  