Fix public timelines being broken by new toots when they are not mounted (#10131)

app/javascript/mastodon/actions/compose.js

@@ -158,7 +158,9 @@ export function submitCompose(routerHistory) {
       // into the columns
 
       const insertIfOnline = timelineId => {
-        if (getState().getIn(['timelines', timelineId, 'items', 0]) !== null) {
+        const timeline = getState().getIn(['timelines', timelineId]);
+
+        if (timeline && timeline.get('items').size > 0 && timeline.getIn(['items', 0]) !== null && timeline.get('online')) {
           dispatch(updateTimeline(timelineId, { ...response.data }));
         }
       };

app/javascript/mastodon/actions/streaming.js

@@ -3,6 +3,7 @@ import {
   updateTimeline,
   deleteFromTimelines,
   expandHomeTimeline,
+  connectTimeline,
   disconnectTimeline,
 } from './timelines';
 import { updateNotifications, expandNotifications } from './notifications';
@@ -16,7 +17,12 @@ export function connectTimelineStream (timelineId, path, pollingRefresh = null,
 
   return connectStream (path, pollingRefresh, (dispatch, getState) => {
     const locale = getState().getIn(['meta', 'locale']);
+
     return {
+      onConnect() {
+        dispatch(connectTimeline(timelineId));
+      },
+
       onDisconnect() {
         dispatch(disconnectTimeline(timelineId));
       },

app/javascript/mastodon/actions/timelines.js

@@ -12,6 +12,7 @@ export const TIMELINE_EXPAND_FAIL    = 'TIMELINE_EXPAND_FAIL';
 
 export const TIMELINE_SCROLL_TOP = 'TIMELINE_SCROLL_TOP';
 
+export const TIMELINE_CONNECT    = 'TIMELINE_CONNECT';
 export const TIMELINE_DISCONNECT = 'TIMELINE_DISCONNECT';
 
 export function updateTimeline(timeline, status, accept) {
@@ -143,6 +144,13 @@ export function scrollTopTimeline(timeline, top) {
   };
 };
 
+export function connectTimeline(timeline) {
+  return {
+    type: TIMELINE_CONNECT,
+    timeline,
+  };
+};
+
 export function disconnectTimeline(timeline) {
   return {
     type: TIMELINE_DISCONNECT,

app/javascript/mastodon/reducers/timelines.js

@@ -6,6 +6,7 @@ import {
   TIMELINE_EXPAND_REQUEST,
   TIMELINE_EXPAND_FAIL,
   TIMELINE_SCROLL_TOP,
+  TIMELINE_CONNECT,
   TIMELINE_DISCONNECT,
 } from '../actions/timelines';
 import {
@@ -20,6 +21,7 @@ const initialState = ImmutableMap();
 
 const initialTimeline = ImmutableMap({
   unread: 0,
+  online: false,
   top: true,
   isLoading: false,
   hasMore: true,
@@ -142,14 +144,13 @@ export default function timelines(state = initialState, action) {
     return filterTimeline('home', state, action.relationship, action.statuses);
   case TIMELINE_SCROLL_TOP:
     return updateTop(state, action.timeline, action.top);
+  case TIMELINE_CONNECT:
+    return state.update(action.timeline, initialTimeline, map => map.set('online', true));
   case TIMELINE_DISCONNECT:
     return state.update(
       action.timeline,
       initialTimeline,
-      map => map.update(
-        'items',
-        items => items.first() ? items.unshift(null) : items
-      )
+      map => map.set('online', false).update('items', items => items.first() ? items.unshift(null) : items)
     );
   default:
     return state;

app/javascript/mastodon/stream.js

@@ -2,11 +2,11 @@ import WebSocketClient from 'websocket.js';
 
 const randomIntUpTo = max => Math.floor(Math.random() * Math.floor(max));
 
-export function connectStream(path, pollingRefresh = null, callbacks = () => ({ onDisconnect() {}, onReceive() {} })) {
+export function connectStream(path, pollingRefresh = null, callbacks = () => ({ onConnect() {}, onDisconnect() {}, onReceive() {} })) {
   return (dispatch, getState) => {
     const streamingAPIBaseURL = getState().getIn(['meta', 'streaming_api_base_url']);
     const accessToken = getState().getIn(['meta', 'access_token']);
-    const { onDisconnect, onReceive } = callbacks(dispatch, getState);
+    const { onConnect, onDisconnect, onReceive } = callbacks(dispatch, getState);
 
     let polling = null;
 
@@ -28,6 +28,8 @@ export function connectStream(path, pollingRefresh = null, callbacks = () => ({
         if (pollingRefresh) {
           clearPolling();
         }
+
+        onConnect();
       },
 
       disconnected () {
@@ -47,6 +49,8 @@ export function connectStream(path, pollingRefresh = null, callbacks = () => ({
           clearPolling();
           pollingRefresh(dispatch);
         }
+
+        onConnect();
       },
 
     });