Add favourited toot to favourites column (#4562)

* Add faved toot to faves column

* renamed append to prepend for clarity

app/javascript/mastodon/reducers/status_lists.js

@@ -3,6 +3,7 @@ import {
   FAVOURITED_STATUSES_EXPAND_SUCCESS,
 } from '../actions/favourites';
 import { Map as ImmutableMap, List as ImmutableList } from 'immutable';
+import { FAVOURITE_SUCCESS } from '../actions/interactions';
 
 const initialState = ImmutableMap({
   favourites: ImmutableMap({
@@ -27,12 +28,20 @@ const appendToList = (state, listType, statuses, next) => {
   }));
 };
 
+const prependOneToList = (state, listType, status) => {
+  return state.update(listType, listMap => listMap.withMutations(map => {
+    map.set('items', map.get('items').unshift(status.get('id')));
+  }));
+};
+
 export default function statusLists(state = initialState, action) {
   switch(action.type) {
   case FAVOURITED_STATUSES_FETCH_SUCCESS:
     return normalizeList(state, 'favourites', action.statuses, action.next);
   case FAVOURITED_STATUSES_EXPAND_SUCCESS:
     return appendToList(state, 'favourites', action.statuses, action.next);
+  case FAVOURITE_SUCCESS:
+    return prependOneToList(state, 'favourites', action.status);
   default:
     return state;
   }