Show "edit thread" link only on opening post, not every post in the thread

boards/templates/boards/post.html

@@ -38,8 +38,10 b''
                 <span class="moderator_info">
                     [<a href="{% url 'admin:boards_post_change' post.id %}"
                         >{% trans 'Edit' %}</a>]
-                    [<a href="{% url 'admin:boards_thread_change' thread.id %}"
-                        >{% trans 'Edit thread' %}</a>]
+                    {% if is_opening %}
+                        [<a href="{% url 'admin:boards_thread_change' thread.id %}"
+                            >{% trans 'Edit thread' %}</a>]
+                    {% endif %}
                 </span>
             {% endif %}
         </div>