anchor.diff:          <div class="filter" id="department-filter">
             <div class="filter-inner">
               <%= label_tag "departments", "Department" %>
  -            <%= select_tag :departments, organisation_filter_options(all_organisations_with(document_type), @filter.selected_organisations), class: "single-row-select" %>
  +            <%= select_tag "departments[]", organisation_filter_options(all_organisations_with(document_type), @filter.selected_organisations), class: "single-row-select" %>
             </div>
           </div>
         <% end %>
  
positive.code:         <div class="filter" id="topic-filter">
            <div class="filter-inner">
              <%= label_tag "topics", "Topic" %>
              <%= select_tag :topics, topic_filter_options(all_topics_with(document_type), @filter.selected_topics), class: "single-row-select" %>
            </div>
          </div>
        <% end %>
  
negative.code:           <div class="filter-inner">
              <div class="publication-type">
                <%= label_tag "world_locations", t('document_filters.world_locations.label'), class: "title" %>
                <%= select_tag "world_locations[]", locations_options(all_locations_with(document_type), @filter.selected_locations), class: "single-row-select" %>
              </div>
            </div>
          </div>
  