Properly unset the active channel in the server

app/actions/remote/channel.ts

@@ -667,6 +667,17 @@ export async function markChannelAsRead(serverUrl: string, channelId: string, up
     }
 }
 
+export async function unsetActiveChannelOnServer(serverUrl: string) {
+    try {
+        const client = NetworkManager.getClient(serverUrl);
+        await client.viewMyChannel('');
+        return {};
+    } catch (error) {
+        logDebug('error on markChannelAsRead', getFullErrorMessage(error));
+        return {error};
+    }
+}
+
 export async function switchToChannelByName(serverUrl: string, channelName: string, teamName: string, errorHandler: (intl: IntlShape) => void, intl: IntlShape) {
     const onError = (joinedTeam: boolean, teamId?: string) => {
         errorHandler(intl);

app/actions/websocket/index.ts

@@ -41,6 +41,7 @@ import {Screens, WebsocketEvents} from '@constants';
 import {SYSTEM_IDENTIFIERS} from '@constants/database';
 import DatabaseManager from '@database/manager';
 import AppsManager from '@managers/apps_manager';
+import {getActiveServerUrl} from '@queries/app/servers';
 import {getLastPostInThread} from '@queries/servers/post';
 import {
     getConfig,
@@ -171,7 +172,8 @@ async function doReconnect(serverUrl: string) {
     }
 
     const tabletDevice = isTablet();
-    if (tabletDevice && initialChannelId === currentChannelId) {
+    const isActiveServer = (await getActiveServerUrl()) === serverUrl;
+    if (isActiveServer && tabletDevice && initialChannelId === currentChannelId) {
         await markChannelAsRead(serverUrl, initialChannelId);
         markChannelAsViewed(serverUrl, initialChannelId);
     }
@@ -483,6 +485,11 @@ export async function handleEvent(serverUrl: string, msg: WebSocketMessage) {
 
 async function fetchPostDataIfNeeded(serverUrl: string) {
     try {
+        const isActiveServer = (await getActiveServerUrl()) === serverUrl;
+        if (!isActiveServer) {
+            return;
+        }
+
         const {database} = DatabaseManager.getServerDatabaseAndOperator(serverUrl);
         const currentChannelId = await getCurrentChannelId(database);
         const isCRTEnabled = await getIsCRTEnabled(database);

app/screens/channel/channel_post_list/channel_post_list.tsx

@@ -5,7 +5,7 @@ import React, {useCallback, useEffect, useRef, useState} from 'react';
 import {type StyleProp, StyleSheet, type ViewStyle, DeviceEventEmitter} from 'react-native';
 import {type Edge, SafeAreaView} from 'react-native-safe-area-context';
 
-import {markChannelAsRead} from '@actions/remote/channel';
+import {markChannelAsRead, unsetActiveChannelOnServer} from '@actions/remote/channel';
 import {fetchPosts, fetchPostsBefore} from '@actions/remote/post';
 import {PER_PAGE_DEFAULT} from '@client/rest/constants';
 import PostList from '@components/post_list';
@@ -84,12 +84,27 @@ const ChannelPostList = ({
         }
     }, [fetchingPosts, posts]);
 
-    useEffect(() => {
+    useDidUpdate(() => {
         if (oldPostsCount.current < posts.length && appState === 'active') {
             oldPostsCount.current = posts.length;
             markChannelAsRead(serverUrl, channelId, true);
         }
-    }, [isCRTEnabled, posts, channelId, serverUrl, appState === 'active']);
+    }, [posts.length]);
+
+    useDidUpdate(() => {
+        if (appState === 'active') {
+            markChannelAsRead(serverUrl, channelId, true);
+        }
+        if (appState !== 'active') {
+            unsetActiveChannelOnServer(serverUrl);
+        }
+    }, [appState === 'active']);
+
+    useEffect(() => {
+        return () => {
+            unsetActiveChannelOnServer(serverUrl);
+        };
+    }, []);
 
     const intro = (<Intro channelId={channelId}/>);