From 55bef1e34fc3b07ed7f762d565a161e74e128016 Mon Sep 17 00:00:00 2001
From: Claire <claire.github-309c@sitedethib.com>
Date: Thu, 25 Aug 2022 17:36:54 +0200
Subject: [PATCH] Fix quickly switching notification filters resulting in empty
 or incorrect list (#19052)

Follow-up to #18960

The aforementioned PR fixed an issue in which switching notification filters
while notifications were loading prevented the query for the new filter from
running, but another issue remained: if the first query completed after the
second one, its results would override the second one, thus leading to the
same issue.

This commit cancels the first request if it is still running, before issuing
the second one.
---
 .../mastodon/actions/notifications.js           | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/app/javascript/mastodon/actions/notifications.js b/app/javascript/mastodon/actions/notifications.js
index 7f62e6c0420..d4588db2c94 100644
--- a/app/javascript/mastodon/actions/notifications.js
+++ b/app/javascript/mastodon/actions/notifications.js
@@ -141,15 +141,22 @@ const excludeTypesFromFilter = filter => {
 
 const noOp = () => {};
 
+let expandNotificationsController = new AbortController();
+
 export function expandNotifications({ maxId, forceLoad } = {}, done = noOp) {
   return (dispatch, getState) => {
     const activeFilter = getState().getIn(['settings', 'notifications', 'quickFilter', 'active']);
     const notifications = getState().get('notifications');
     const isLoadingMore = !!maxId;
 
-    if (notifications.get('isLoading') && !forceLoad) {
-      done();
-      return;
+    if (notifications.get('isLoading')) {
+      if (forceLoad) {
+        expandNotificationsController.abort();
+        expandNotificationsController = new AbortController();
+      } else {
+        done();
+        return;
+      }
     }
 
     const params = {
@@ -174,7 +181,7 @@ export function expandNotifications({ maxId, forceLoad } = {}, done = noOp) {
 
     dispatch(expandNotificationsRequest(isLoadingMore));
 
-    api(getState).get('/api/v1/notifications', { params }).then(response => {
+    api(getState).get('/api/v1/notifications', { params, signal: expandNotificationsController.signal }).then(response => {
       const next = getLinks(response).refs.find(link => link.rel === 'next');
 
       dispatch(importFetchedAccounts(response.data.map(item => item.account)));
@@ -215,7 +222,7 @@ export function expandNotificationsFail(error, isLoadingMore) {
     type: NOTIFICATIONS_EXPAND_FAIL,
     error,
     skipLoading: !isLoadingMore,
-    skipAlert: !isLoadingMore,
+    skipAlert: !isLoadingMore || error.name === 'AbortError',
   };
 };