perform heavy calls only first time

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -1087,8 +1087,6 @@ class _MessageListViewState extends State<MessageListView> {
     _itemPositionListener =
         widget.itemPositionListener ?? ItemPositionsListener.create();
 
-    streamChannel = StreamChannel.of(context);
-
     initialIndex = _initialIndex;
     initialAlignment = _initialAlignment;
 
@@ -1100,6 +1098,7 @@ class _MessageListViewState extends State<MessageListView> {
   void didChangeDependencies() {
     streamChannel = StreamChannel.of(context);
 
+    if (_messageNewListener == null) {
       _messageNewListener?.cancel();
       _messageNewListener =
           streamChannel.channel.on(EventType.messageNew).listen((event) {
@@ -1120,6 +1119,7 @@ class _MessageListViewState extends State<MessageListView> {
       if (_isThreadConversation) {
         streamChannel.getReplies(widget.parentMessage!.id);
       }
+    }
     super.didChangeDependencies();
   }
 

packages/stream_chat_flutter_core/lib/src/channel_list_core.dart

@@ -178,10 +178,7 @@ class ChannelListCoreState extends State<ChannelListCore> {
 
     if (_subscription == null) {
       loadData();
-    }
-
       final client = _streamChatCoreState.client;
-    _subscription?.cancel();
       _subscription = client
           .on(
             EventType.connectionRecovered,
@@ -190,6 +187,7 @@ class ChannelListCoreState extends State<ChannelListCore> {
             EventType.channelVisible,
           )
           .listen((event) => loadData());
+    }
 
     super.didChangeDependencies();
   }

packages/stream_chat_flutter_core/lib/src/channels_bloc.dart

@@ -149,7 +149,7 @@ class ChannelsBlocState extends State<ChannelsBloc>
     _streamChatCoreState = StreamChatCore.of(context);
     final client = _streamChatCoreState.client;
 
-    _cancelSubscriptions();
+    if (_subscriptions.isEmpty) {
       if (!widget.lockChannelsOrder) {
         _subscriptions.add(client
             .on(
@@ -164,7 +164,8 @@ class ChannelsBlocState extends State<ChannelsBloc>
               newChannels.insert(0, channel);
             }
           } else if (widget.shouldAddChannel?.call(e) == true) {
-          final hiddenIndex = _hiddenChannels.indexWhere((c) => c.cid == e.cid);
+            final hiddenIndex =
+                _hiddenChannels.indexWhere((c) => c.cid == e.cid);
             if (hiddenIndex != -1) {
               newChannels.insert(0, _hiddenChannels[hiddenIndex]);
               _hiddenChannels.removeAt(hiddenIndex);
@@ -185,7 +186,8 @@ class ChannelsBlocState extends State<ChannelsBloc>
       _subscriptions
         ..add(client.on(EventType.channelHidden).listen((event) async {
           final newChannels = List<Channel>.from(channels ?? []);
-        final channelIndex = newChannels.indexWhere((c) => c.cid == event.cid);
+          final channelIndex =
+              newChannels.indexWhere((c) => c.cid == event.cid);
           if (channelIndex > -1) {
             final channel = newChannels.removeAt(channelIndex);
             _hiddenChannels.add(channel);
@@ -202,6 +204,7 @@ class ChannelsBlocState extends State<ChannelsBloc>
           _channelsController.add(List.from(
               (channels ?? [])..removeWhere((c) => c.cid == channel?.cid)));
         }));
+    }
 
     super.didChangeDependencies();
   }

packages/stream_chat_flutter_core/lib/src/message_list_core.dart

@@ -173,10 +173,13 @@ class MessageListCoreState extends State<MessageListCore> {
     }
   }
 
+  var _initialized = false;
+
   @override
   void didChangeDependencies() {
     _streamChannel = StreamChannel.of(context);
-    if (_isThreadConversation) {
+    if (!_initialized && _isThreadConversation) {
+      _initialized = true;
       _streamChannel.getReplies(widget.parentMessage!.id);
     }
     super.didChangeDependencies();

packages/stream_chat_flutter_core/lib/src/message_search_list_core.dart

@@ -107,10 +107,17 @@ class MessageSearchListCore extends StatefulWidget {
 class MessageSearchListCoreState extends State<MessageSearchListCore> {
   late MessageSearchBlocState _messageSearchBloc;
 
+  var _initialized = false;
+
   @override
   void didChangeDependencies() {
     _messageSearchBloc = MessageSearchBloc.of(context);
+
+    if (!_initialized) {
       loadData();
+      _initialized = true;
+    }
+
     if (widget.messageSearchListController != null) {
       widget.messageSearchListController!.loadData = loadData;
       widget.messageSearchListController!.paginateData = paginateData;

packages/stream_chat_flutter_core/lib/src/user_list_core.dart

@@ -122,9 +122,14 @@ class UserListCore extends StatefulWidget {
 /// The current state of the [UserListCore].
 class UserListCoreState extends State<UserListCore>
     with WidgetsBindingObserver {
+  var _initialized = false;
+
   @override
   void didChangeDependencies() {
+    if (!_initialized) {
       loadData();
+      _initialized = true;
+    }
     if (widget.userListController != null) {
       widget.userListController!.loadData = loadData;
       widget.userListController!.paginateData = paginateData;