Retain list person bloc state

lib/bloc/list_person.dart

@@ -1,4 +1,5 @@
 import 'package:bloc/bloc.dart';
+import 'package:kiwi/kiwi.dart';
 import 'package:logging/logging.dart';
 import 'package:nc_photos/account.dart';
 import 'package:nc_photos/entity/person.dart';
@@ -70,6 +71,22 @@ class ListPersonBlocFailure extends ListPersonBlocState {
 class ListPersonBloc extends Bloc<ListPersonBlocEvent, ListPersonBlocState> {
   ListPersonBloc() : super(ListPersonBlocInit());
 
+  static ListPersonBloc of(Account account) {
+    final id =
+        "${account.scheme}://${account.username}@${account.address}?${account.roots.join('&')}";
+    try {
+      _log.fine("[of] Resolving bloc for '$id'");
+      return KiwiContainer().resolve<ListPersonBloc>("ListPersonBloc($id)");
+    } catch (_) {
+      // no created instance for this account, make a new one
+      _log.info("[of] New bloc instance for account: $account");
+      final bloc = ListPersonBloc();
+      KiwiContainer().registerInstance<ListPersonBloc>(bloc,
+          name: "ListPersonBloc($id)");
+      return bloc;
+    }
+  }
+
   @override
   mapEventToState(ListPersonBlocEvent event) async* {
     _log.info("[mapEventToState] $event");

lib/widget/people_browser.dart

@@ -78,7 +78,16 @@ class _PeopleBrowserState extends State<PeopleBrowser> {
   }
 
   void _initBloc() {
+    if (_bloc.state is ListPersonBlocInit) {
       _log.info("[_initBloc] Initialize bloc");
+    } else {
+      // process the current state
+      WidgetsBinding.instance!.addPostFrameCallback((_) {
+        setState(() {
+          _onStateChange(context, _bloc.state);
+        });
+      });
+    }
     _reqQuery();
   }
 
@@ -212,14 +221,13 @@ class _PeopleBrowserState extends State<PeopleBrowser> {
               onTap: () => _onItemTap(e),
             ))
         .toList();
-    // _items = [];
   }
 
   void _reqQuery() {
     _bloc.add(ListPersonBlocQuery(widget.account));
   }
 
-  final _bloc = ListPersonBloc();
+  late final _bloc = ListPersonBloc.of(widget.account);
 
   var _items = <_ListItem>[];