fix(ActivityStream): fix display order of previous activities

Author: lalli-flores

src/adapters/RoomsAdapter.js

@@ -66,7 +66,7 @@ export default class RoomsAdapter extends WebexAdapter {
    * Returns an observable that emits an array of the next chunk of previous
    * activity data of the given roomID. If `hasMoreActivities` returns false,
    * the observable will complete.
-   * **Previous activity data must be sorted oldest-to-latest.**
+   * **Previous activity data must be sorted newest-to-oldest.**
    *
    * @param {string} ID  ID of the room for which to get activities.
    * @returns {Observable.<Array.<string|ActivityDate>>}

src/adapters/RoomsJSONAdapter.js

@@ -72,7 +72,7 @@ export default class RoomsJSONAdapter extends RoomsAdapter {
    * Returns an observable that emits an array of the next chunk of previous
    * activity data of the given roomID. If `hasMoreActivities` returns false,
    * the observable will complete.
-   * **Previous activity data must be sorted oldest-to-latest.**
+   * **Previous activity data must be sorted newest-to-oldest.**
    *
    * The next chunk is based on the adapter's `dataChunkSize`.
    *

src/components/hooks/useActivityStream.js

@@ -19,7 +19,7 @@ function reducer(activities, action) {
 
   switch (action.type) {
     case PREPEND_ACTIVITIES:
-      newActivities = action.payload.concat(activities);
+      newActivities = action.payload.reverse().concat(activities);
       break;
     case APPEND_ACTIVITIES:
       newActivities = activities.concat(action.payload);