Display list column (#5750)

app/javascript/mastodon/reducers/index.js

@@ -22,6 +22,7 @@ import media_attachments from './media_attachments';
 import notifications from './notifications';
 import height_cache from './height_cache';
 import custom_emojis from './custom_emojis';
+import lists from './lists';
 
 const reducers = {
   timelines,
@@ -47,6 +48,7 @@ const reducers = {
   notifications,
   height_cache,
   custom_emojis,
+  lists,
 };
 
 export default combineReducers(reducers);

app/javascript/mastodon/reducers/lists.js

@@ -0,0 +1,15 @@
+import { LIST_FETCH_SUCCESS } from '../actions/lists';
+import { Map as ImmutableMap, fromJS } from 'immutable';
+
+const initialState = ImmutableMap();
+
+const normalizeList = (state, list) => state.set(list.id, fromJS(list));
+
+export default function lists(state = initialState, action) {
+  switch(action.type) {
+  case LIST_FETCH_SUCCESS:
+    return normalizeList(state, action.list);
+  default:
+    return state;
+  }
+};