refactor: Follow up handle logout and login with new client

lib/config/routes.dart

@@ -44,13 +44,17 @@ abstract class AppRoutes {
     BuildContext context,
     GoRouterState state,
   ) =>
-      Matrix.of(context).client.isLogged() ? '/rooms' : null;
+      Matrix.of(context).widget.clients.any((client) => client.isLogged())
+          ? '/rooms'
+          : null;
 
   static FutureOr<String?> loggedOutRedirect(
     BuildContext context,
     GoRouterState state,
   ) =>
-      Matrix.of(context).client.isLogged() ? null : '/home';
+      Matrix.of(context).widget.clients.any((client) => client.isLogged())
+          ? null
+          : '/home';
 
   AppRoutes();
 
@@ -58,7 +62,9 @@ abstract class AppRoutes {
     GoRoute(
       path: '/',
       redirect: (context, state) =>
-          Matrix.of(context).client.isLogged() ? '/rooms' : '/home',
+          Matrix.of(context).widget.clients.any((client) => client.isLogged())
+              ? '/rooms'
+              : '/home',
     ),
     GoRoute(
       path: '/home',

lib/pages/homeserver_picker/homeserver_picker_view.dart

@@ -25,7 +25,8 @@ class HomeserverPickerView extends StatelessWidget {
     final theme = Theme.of(context);
 
     return LoginScaffold(
-      enforceMobileMode: Matrix.of(context).client.isLogged(),
+      enforceMobileMode:
+          Matrix.of(context).widget.clients.any((client) => client.isLogged()),
       appBar: AppBar(
         centerTitle: true,
         title: Text(

lib/pages/login/login.dart

@@ -70,7 +70,7 @@ class LoginController extends State<Login> {
         identifier = AuthenticationUserIdentifier(user: username);
       }
       final client = await matrix.getLoginClient();
-      client.login(
+      await client.login(
         LoginType.mLoginPassword,
         identifier: identifier,
         // To stay compatible with older server versions

lib/pages/login/login_view.dart

@@ -21,7 +21,8 @@ class LoginView extends StatelessWidget {
     final titleParts = title.split(homeserver);
 
     return LoginScaffold(
-      enforceMobileMode: Matrix.of(context).client.isLogged(),
+      enforceMobileMode:
+          Matrix.of(context).widget.clients.any((client) => client.isLogged()),
       appBar: AppBar(
         leading: controller.loading ? null : const Center(child: BackButton()),
         automaticallyImplyLeading: !controller.loading,

lib/widgets/matrix.dart

@@ -174,6 +174,7 @@ class MatrixState extends State<Matrix> with WidgetsBindingObserver {
             _loginClientCandidate = null;
             FluffyChatApp.router.go('/rooms');
           });
+    if (widget.clients.isEmpty) widget.clients.add(candidate);
     return candidate;
   }
 
@@ -282,12 +283,12 @@ class MatrixState extends State<Matrix> with WidgetsBindingObserver {
     onLoginStateChanged[name] ??= c.onLoginStateChanged.stream.listen((state) {
       final loggedInWithMultipleClients = widget.clients.length > 1;
       if (state == LoginState.loggedOut) {
-        InitWithRestoreExtension.deleteSessionBackup(name);
-      }
-      if (loggedInWithMultipleClients && state != LoginState.loggedIn) {
         _cancelSubs(c.clientName);
         widget.clients.remove(c);
         ClientManager.removeClientNameFromStore(c.clientName, store);
+        InitWithRestoreExtension.deleteSessionBackup(name);
+      }
+      if (loggedInWithMultipleClients && state != LoginState.loggedIn) {
         ScaffoldMessenger.of(
           FluffyChatApp.router.routerDelegate.navigatorKey.currentContext ??
               context,
@@ -379,6 +380,7 @@ class MatrixState extends State<Matrix> with WidgetsBindingObserver {
     Logs().v('AppLifecycleState = $state');
     final foreground = state != AppLifecycleState.inactive &&
         state != AppLifecycleState.paused;
+    for (final client in widget.clients) {
       client.syncPresence =
           state == AppLifecycleState.resumed ? null : PresenceType.unavailable;
       if (PlatformInfos.isMobile) {
@@ -387,6 +389,7 @@ class MatrixState extends State<Matrix> with WidgetsBindingObserver {
         Logs().v('Set background sync to', foreground);
       }
     }
+  }
 
   void initSettings() {
     AppConfig.fontSizeFactor =