Switch to side-by-side view

--- a/Allura/allura/controllers/discuss.py
+++ b/Allura/allura/controllers/discuss.py
@@ -299,7 +299,8 @@
                     thread=self.post.thread,
                     reply_subject=self.post.reply_subject,
                     attachments=self.post.attachments,
-                    related_artifacts=self.post.related_artifacts
+                    related_artifacts=self.post.related_artifacts,
+                    parent_security_context=lambda: None,
                     )
             else:
                 post=self.post