From ec3b449baa122cb881556422f1b3d586ad5a9a6c Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Sat, 9 Dec 2017 02:22:13 +0100
Subject: [PATCH] Fix #5630 - Prevent duplicate load of favourites (#5931)

---
 app/javascript/mastodon/actions/favourites.js        |  6 +++++-
 .../mastodon/features/favourited_statuses/index.js   | 10 +++++++---
 app/javascript/mastodon/reducers/status_lists.js     | 12 ++++++++++++
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/app/javascript/mastodon/actions/favourites.js b/app/javascript/mastodon/actions/favourites.js
index 09ce51fce..93094c526 100644
--- a/app/javascript/mastodon/actions/favourites.js
+++ b/app/javascript/mastodon/actions/favourites.js
@@ -10,6 +10,10 @@ export const FAVOURITED_STATUSES_EXPAND_FAIL    = 'FAVOURITED_STATUSES_EXPAND_FA
 
 export function fetchFavouritedStatuses() {
   return (dispatch, getState) => {
+    if (getState().getIn(['status_lists', 'favourites', 'isLoading'])) {
+      return;
+    }
+
     dispatch(fetchFavouritedStatusesRequest());
 
     api(getState).get('/api/v1/favourites').then(response => {
@@ -46,7 +50,7 @@ export function expandFavouritedStatuses() {
   return (dispatch, getState) => {
     const url = getState().getIn(['status_lists', 'favourites', 'next'], null);
 
-    if (url === null) {
+    if (url === null || getState().getIn(['status_lists', 'favourites', 'isLoading'])) {
       return;
     }
 
diff --git a/app/javascript/mastodon/features/favourited_statuses/index.js b/app/javascript/mastodon/features/favourited_statuses/index.js
index 1e1f5873c..67b107bc8 100644
--- a/app/javascript/mastodon/features/favourited_statuses/index.js
+++ b/app/javascript/mastodon/features/favourited_statuses/index.js
@@ -9,6 +9,7 @@ import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import StatusList from '../../components/status_list';
 import { defineMessages, injectIntl } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import { debounce } from 'lodash';
 
 const messages = defineMessages({
   heading: { id: 'column.favourites', defaultMessage: 'Favourites' },
@@ -16,6 +17,7 @@ const messages = defineMessages({
 
 const mapStateToProps = state => ({
   statusIds: state.getIn(['status_lists', 'favourites', 'items']),
+  isLoading: state.getIn(['status_lists', 'favourites', 'isLoading'], true),
   hasMore: !!state.getIn(['status_lists', 'favourites', 'next']),
 });
 
@@ -30,6 +32,7 @@ export default class Favourites extends ImmutablePureComponent {
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
     hasMore: PropTypes.bool,
+    isLoading: PropTypes.bool,
   };
 
   componentWillMount () {
@@ -59,12 +62,12 @@ export default class Favourites extends ImmutablePureComponent {
     this.column = c;
   }
 
-  handleScrollToBottom = () => {
+  handleScrollToBottom = debounce(() => {
     this.props.dispatch(expandFavouritedStatuses());
-  }
+  }, 300, { leading: true })
 
   render () {
-    const { intl, statusIds, columnId, multiColumn, hasMore } = this.props;
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
     const pinned = !!columnId;
 
     return (
@@ -85,6 +88,7 @@ export default class Favourites extends ImmutablePureComponent {
           statusIds={statusIds}
           scrollKey={`favourited_statuses-${columnId}`}
           hasMore={hasMore}
+          isLoading={isLoading}
           onScrollToBottom={this.handleScrollToBottom}
         />
       </Column>
diff --git a/app/javascript/mastodon/reducers/status_lists.js b/app/javascript/mastodon/reducers/status_lists.js
index c4aeb338f..6c5f33557 100644
--- a/app/javascript/mastodon/reducers/status_lists.js
+++ b/app/javascript/mastodon/reducers/status_lists.js
@@ -1,6 +1,10 @@
 import {
+  FAVOURITED_STATUSES_FETCH_REQUEST,
   FAVOURITED_STATUSES_FETCH_SUCCESS,
+  FAVOURITED_STATUSES_FETCH_FAIL,
+  FAVOURITED_STATUSES_EXPAND_REQUEST,
   FAVOURITED_STATUSES_EXPAND_SUCCESS,
+  FAVOURITED_STATUSES_EXPAND_FAIL,
 } from '../actions/favourites';
 import {
   PINNED_STATUSES_FETCH_SUCCESS,
@@ -30,6 +34,7 @@ const normalizeList = (state, listType, statuses, next) => {
   return state.update(listType, listMap => listMap.withMutations(map => {
     map.set('next', next);
     map.set('loaded', true);
+    map.set('isLoading', false);
     map.set('items', ImmutableList(statuses.map(item => item.id)));
   }));
 };
@@ -37,6 +42,7 @@ const normalizeList = (state, listType, statuses, next) => {
 const appendToList = (state, listType, statuses, next) => {
   return state.update(listType, listMap => listMap.withMutations(map => {
     map.set('next', next);
+    map.set('isLoading', false);
     map.set('items', map.get('items').concat(statuses.map(item => item.id)));
   }));
 };
@@ -55,6 +61,12 @@ const removeOneFromList = (state, listType, status) => {
 
 export default function statusLists(state = initialState, action) {
   switch(action.type) {
+  case FAVOURITED_STATUSES_FETCH_REQUEST:
+  case FAVOURITED_STATUSES_EXPAND_REQUEST:
+    return state.setIn(['favourites', 'isLoading'], true);
+  case FAVOURITED_STATUSES_FETCH_FAIL:
+  case FAVOURITED_STATUSES_EXPAND_FAIL:
+    return state.setIn(['favourites', 'isLoading'], false);
   case FAVOURITED_STATUSES_FETCH_SUCCESS:
     return normalizeList(state, 'favourites', action.statuses, action.next);
   case FAVOURITED_STATUSES_EXPAND_SUCCESS: