move get replies logic to didupdatewidget

packages/stream_chat_flutter_core/lib/src/message_list_core.dart

@@ -178,10 +178,10 @@ class MessageListCoreState extends State<MessageListCore> {
     final newStreamChannel = StreamChannel.of(context);
 
     if (newStreamChannel != _streamChannel) {
-      _streamChannel = newStreamChannel;
-      if (_isThreadConversation) {
+      if (_streamChannel == null /*only first time*/ && _isThreadConversation) {
         _streamChannel!.getReplies(widget.parentMessage!.id);
       }
+      _streamChannel = newStreamChannel;
     }
 
     super.didChangeDependencies();
@@ -194,6 +194,12 @@ class MessageListCoreState extends State<MessageListCore> {
     if (widget.messageListController != oldWidget.messageListController) {
       _setupController();
     }
+
+    if (widget.parentMessage?.id != widget.parentMessage?.id) {
+      if (_isThreadConversation) {
+        _streamChannel!.getReplies(widget.parentMessage!.id);
+      }
+    }
   }
 
   @override