BUGFIX created way of knowing whether user has permission to post

src/Model/Comment.php

@@ -765,6 +765,20 @@ class Comment extends DataObject
         return $notSpam && (!$maxLevel || $this->Depth < $maxLevel);
     }
 
+    /**
+     * Proxy for checking whether the has permission to comment on the comment parent.
+     *
+     * @param Member $member Member to check
+     *
+     * @return boolean
+     */
+    public function canPostComment($member = null)
+    {
+        return $this->Parent()
+            && $this->Parent()->exists()
+            && $this->Parent()->canPostComment($member);
+    }
+
     /**
      * Returns the list of all replies
      *