show searched tag

lms/templates/discussion/_search_bar.html

@@ -9,6 +9,10 @@ def base_url_for_search():
 %>
 
 <form action="${base_url_for_search()}" method="get" class="discussion-search-form">
-  <input class="search-input" type="text" value="${text}" id="keywords" autocomplete="off"/>
+  % if 'tag' in query_params:
+    <input class="search-input" type="text" value="[${tags}]${text}" id="keywords" autocomplete="off"/>
+  % else:
+    <input class="search-input" type="text" value="[${tags}]${text}" id="keywords" autocomplete="off"/>
+  % endif
   <div class="discussion-link discussion-search-link" href="javascript:void(0)">Search posts</div>
 </form>