Programmatically indicate nested discussions in filter

This is an a11y fix on the discussion topic display on the left. We are going to write out all the parent catagories for each topic
EDUCATOR-1549

lms/templates/discussion/_filter_dropdown.html

@@ -5,37 +5,47 @@ from lms.djangoapps.django_comment_client.constants import TYPE_ENTRY
 from openedx.core.djangolib.markup import HTML
 %>
 
-<%def name="render_dropdown(map)">
+<%def name="render_dropdown(map, topic_list)">
     % for child, c_type in map["children"]:
         % if child in map["entries"] and c_type == TYPE_ENTRY:
-            ${HTML(render_entry(map["entries"], child))}
+            ${HTML(render_entry(map["entries"], child, topic_list))}
         %else:
-            ${HTML(render_category(map["subcategories"], child))}
+            ${HTML(render_category(map["subcategories"], child, topic_list))}
         %endif
     %endfor
 </%def>
 
-<%def name="render_entry(entries, entry)">
+<%def name="render_entry(entries, entry, topic_list)">
     <li
         class="forum-nav-browse-menu-item"
         data-discussion-id='${entries[entry]["id"]}'
         id='${entries[entry]["id"]}'
         data-divided="${str(entries[entry]['is_divided']).lower()}"
-        role="option"
+        role="presentation"
     >
-         % if entry:
-        <span class="forum-nav-browse-title">${entry}</span>
-         %endif
+    %if entry:
+        <span class="forum-nav-browse-title" role="option">
+        %if topic_list:
+            <span class="sr">
+                ${', '.join(topic_list)},  
+            </span>
+        %endif
+        ${entry}
+        </span>
+    %endif
     </li>
 </%def>
 
-<%def name="render_category(categories, category)">
+<%def name="render_category(categories, category, topic_list)">
     <li class="forum-nav-browse-menu-item"
         id='${category | u}'
+        role="presentation"
     >
-        <span class="forum-nav-browse-title">${category}</span>
-        <ul class="forum-nav-browse-submenu">
-            ${HTML(render_dropdown(categories[category]))}
+        <span class="forum-nav-browse-title" role="option">${category}</span>
+        <ul class="forum-nav-browse-submenu" role="presentation">
+            <% topic_list.append(category) %>
+            ${HTML(render_dropdown(categories[category], topic_list))}
+            <% topic_list.remove(category) %>
         </ul>
     </li>
 </%def>
@@ -49,13 +59,13 @@ from openedx.core.djangolib.markup import HTML
         </label>
     </form>
     <ul class="forum-nav-browse-menu" role="listbox" id="discussion_topics_listbox">
-        <li class="forum-nav-browse-menu-item forum-nav-browse-menu-all" role="option" id="all_discussions">
-            <span class="forum-nav-browse-title">${_("All Discussions")}</span>
+        <li class="forum-nav-browse-menu-item forum-nav-browse-menu-all" role="presentation" id="all_discussions">
+            <span class="forum-nav-browse-title" role="option">${_("All Discussions")}</span>
         </li>
-        <li class="forum-nav-browse-menu-item forum-nav-browse-menu-following" role="option" id="posts_following">
+        <li class="forum-nav-browse-menu-item forum-nav-browse-menu-following" role="presentation" id="posts_following">
             <span class="icon fa fa-star" aria-hidden="true"></span>
-            <span class="forum-nav-browse-title">${_("Posts I'm Following")}</span>
+            <span class="forum-nav-browse-title" role="option">${_("Posts I'm Following")}</span>
         </li>
-        ${HTML(render_dropdown(category_map))}
+        ${HTML(render_dropdown(category_map, []))}
     </ul>
 </div>