When unfollowing, remove from home in web UI immediately (#5369)

Do NOT send "delete" through streaming API when unmerging from
home timeline. "delete" implies that the original status was
deleted, which is not true!

app/javascript/mastodon/actions/accounts.js

@@ -122,7 +122,7 @@ export function unfollowAccount(id) {
     dispatch(unfollowAccountRequest(id));
 
     api(getState).post(`/api/v1/accounts/${id}/unfollow`).then(response => {
-      dispatch(unfollowAccountSuccess(response.data));
+      dispatch(unfollowAccountSuccess(response.data, getState().get('statuses')));
     }).catch(error => {
       dispatch(unfollowAccountFail(error));
     });
@@ -157,10 +157,11 @@ export function unfollowAccountRequest(id) {
   };
 };
 
-export function unfollowAccountSuccess(relationship) {
+export function unfollowAccountSuccess(relationship, statuses) {
   return {
     type: ACCOUNT_UNFOLLOW_SUCCESS,
     relationship,
+    statuses,
   };
 };
 

app/javascript/mastodon/reducers/timelines.js

@@ -14,6 +14,7 @@ import {
 import {
   ACCOUNT_BLOCK_SUCCESS,
   ACCOUNT_MUTE_SUCCESS,
+  ACCOUNT_UNFOLLOW_SUCCESS,
 } from '../actions/accounts';
 import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable';
 
@@ -108,6 +109,12 @@ const filterTimelines = (state, relationship, statuses) => {
   return state;
 };
 
+const filterTimeline = (timeline, state, relationship, statuses) =>
+  state.updateIn([timeline, 'items'], ImmutableList(), list =>
+    list.filterNot(statusId =>
+      statuses.getIn([statusId, 'account']) === relationship.id
+    ));
+
 const updateTop = (state, timeline, top) => {
   return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
     if (top) mMap.set('unread', 0);
@@ -134,6 +141,8 @@ export default function timelines(state = initialState, action) {
   case ACCOUNT_BLOCK_SUCCESS:
   case ACCOUNT_MUTE_SUCCESS:
     return filterTimelines(state, action.relationship, action.statuses);
+  case ACCOUNT_UNFOLLOW_SUCCESS:
+    return filterTimeline('home', state, action.relationship, action.statuses);
   case TIMELINE_SCROLL_TOP:
     return updateTop(state, action.timeline, action.top);
   case TIMELINE_CONNECT:

app/lib/feed_manager.rb

@@ -85,7 +85,7 @@ class FeedManager
     oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true)&.first&.last&.to_i || 0
 
     from_account.statuses.select('id, reblog_of_id').where('id > ?', oldest_home_score).reorder(nil).find_each do |status|
-      unpush(:home, into_account, status)
+      remove_from_feed(:home, into_account, status)
     end
   end