Use OrderedSet

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/features/status/index.js

@@ -71,15 +71,13 @@ const makeMapStateToProps = () => {
     (_, { id }) => id,
     state => state.getIn(['contexts', 'inReplyTos']),
   ], (statusId, inReplyTos) => {
-    let ancestorsIds = Immutable.List();
-    ancestorsIds = ancestorsIds.withMutations(mutable => {
+    let ancestorsIds = Immutable.OrderedSet();
     let id = statusId;
 
     while (id) {
-        mutable.unshift(id);
+      ancestorsIds = Immutable.OrderedSet([id]).union(ancestorsIds);
       id = inReplyTos.get(id);
     }
-    });
 
     return ancestorsIds;
   });
@@ -88,8 +86,7 @@ const makeMapStateToProps = () => {
     (_, { id }) => id,
     state => state.getIn(['contexts', 'replies']),
   ], (statusId, contextReplies) => {
-    let descendantsIds = Immutable.List();
-    descendantsIds = descendantsIds.withMutations(mutable => {
+    let descendantsIds = Immutable.OrderedSet();
     const ids = [statusId];
 
     while (ids.length > 0) {
@@ -97,7 +94,7 @@ const makeMapStateToProps = () => {
       const replies = contextReplies.get(id);
 
       if (statusId !== id) {
-          mutable.push(id);
+        descendantsIds = descendantsIds.union([id]);
       }
 
       if (replies) {
@@ -106,7 +103,6 @@ const makeMapStateToProps = () => {
         });
       }
     }
-    });
 
     return descendantsIds;
   });