Refactor listener out of user profile and fix thread logic

web/react/utils/utils.jsx

@@ -1417,3 +1417,7 @@ export function languages() {
 export function isPostEphemeral(post) {
     return post.type === Constants.POST_TYPE_EPHEMERAL || post.state === Constants.POST_DELETED;
 }
+
+export function getRootId(post) {
+    return post.root_id === '' ? post.id : post.root_id;
+}