slight changes

lms/static/coffee/src/discussion/content.coffee

@@ -76,6 +76,7 @@ Discussion = @Discussion
           $comment = $(response.html)
           $content.children(".comments").prepend($comment)
           Discussion.setWmdContent $content, $local, "reply-body", ""
+          Discussion.setContentInfo id, 'editable', true
           Discussion.initializeContent($comment)
           Discussion.bindContentEvents($comment)
           $local(".discussion-reply-new").hide()
@@ -200,9 +201,7 @@ Discussion = @Discussion
           type: "GET"
           dataType: 'json'
           success: (response, textStatus) ->
-            if not $$annotated_content_info?
-              window.$$annotated_content_info = {}
-            window.$$annotated_content_info = $.extend $$annotated_content_info, response['annotated_content_info']
+            Discussion.bulkExtendContentInfo response['annotated_content_info']
             $content.append(response['html'])
             $content.find(".comment").each (index, comment) ->
               Discussion.initializeContent(comment)
@@ -251,6 +250,5 @@ Discussion = @Discussion
     $contentBody.html(converter.makeHtml(raw_text))
     MathJax.Hub.Queue ["Typeset", MathJax.Hub, $contentBody.attr("id")]
     id = $content.attr("_id")
-    if $$annotated_content_info?
-      if not ($$annotated_content_info[id] || [])['editable']
-        $local(".discussion-edit").remove()
+    if not Discussion.getContentInfo id, 'editable'
+      $local(".discussion-edit").remove()

lms/static/coffee/src/discussion/discussion.coffee

@@ -108,6 +108,7 @@ initializeFollowThread = (index, thread) ->
           $thread = $(response.html)
           $discussion.children(".threads").prepend($thread)
           Discussion.setWmdContent $discussion, $local, "new-post-body", ""
+          Discussion.setContentInfo id, 'editable', true
           Discussion.initializeContent($thread)
           Discussion.bindContentEvents($thread)
           $(".new-post-form").hide()

lms/static/coffee/src/discussion/utils.coffee

@@ -109,3 +109,19 @@ wmdEditors = {}
     console.log wmdEditors
     console.log "#{cls_identifier}-#{id}"
     wmdEditors["#{cls_identifier}-#{id}"].refreshPreview()
+
+  getContentInfo: (id, attr) ->
+    if not window.$$annotated_content_info?
+      window.$$annotated_content_info = {}
+    (window.$$annotated_content_info[id] || {})[attr]
+
+  setContentInfo: (id, attr, value) ->
+    if not window.$$annotated_content_info?
+      window.$$annotated_content_info = {}
+    window.$$annotated_content_info[id] ||= {}
+    window.$$annotated_content_info[id][attr] = value
+
+  bulkExtendContentInfo: (newInfos) ->
+    if not window.$$annotated_content_info?
+      window.$$annotated_content_info = {}
+    window.$$annotated_content_info = $.extend window.$$annotated_content_info, newInfos