fix(llc, core): fix message pagination parameters

packages/stream_chat_flutter_core/lib/src/paged_value_scroll_view.dart

@@ -322,7 +322,7 @@ class _PagedValueListViewState<K, V> extends State<PagedValueListView<K, V>> {
                       index == newPageRequestTriggerIndex;
                   if (nextPageKey != null && isBuildingTriggerIndexItem) {
                     // Schedules the request for the end of this frame.
-                    WidgetsBinding.instance?.addPostFrameCallback((_) async {
+                    WidgetsBinding.instance.addPostFrameCallback((_) async {
                       if (error == null) {
                         await _controller.loadMore(nextPageKey);
                       }
@@ -678,7 +678,7 @@ class _PagedValueGridViewState<K, V> extends State<PagedValueGridView<K, V>> {
                       index == newPageRequestTriggerIndex;
                   if (nextPageKey != null && isBuildingTriggerIndexItem) {
                     // Schedules the request for the end of this frame.
-                    WidgetsBinding.instance?.addPostFrameCallback((_) async {
+                    WidgetsBinding.instance.addPostFrameCallback((_) async {
                       if (error == null) {
                         await _controller.loadMore(nextPageKey);
                       }

packages/stream_chat_flutter_core/lib/src/stream_channel.dart

@@ -220,21 +220,20 @@ class StreamChannelState extends State<StreamChannel> {
   /// Loads channel at specific message
   Future<void> loadChannelAtMessage(
     String? messageId, {
-    int before = 20,
-    int after = 20,
+    @Deprecated('before is deprecated, use limit instead') int before = 20,
+    @Deprecated('before is deprecated, use limit instead') int after = 20,
+    int limit = 20,
     bool preferOffline = false,
   }) =>
       _queryAtMessage(
         messageId: messageId,
-        before: before,
-        after: after,
+        limit: limit,
         preferOffline: preferOffline,
       );
 
   Future<ChannelState?> _queryAtMessage({
     String? messageId,
-    int before = 20,
-    int after = 20,
+    int limit = 20,
     bool preferOffline = false,
   }) async {
     if (channel.state == null) return null;
@@ -244,7 +243,7 @@ class StreamChannelState extends State<StreamChannel> {
     if (messageId == null) {
       await channel.query(
         messagesPagination: PaginationParams(
-          limit: before,
+          limit: limit,
         ),
         preferOffline: preferOffline,
       );
@@ -254,8 +253,7 @@ class StreamChannelState extends State<StreamChannel> {
 
     return queryAroundMessage(
       messageId,
-      before: before,
-      after: after,
+      limit: limit,
       preferOffline: preferOffline,
     );
   }
@@ -263,15 +261,15 @@ class StreamChannelState extends State<StreamChannel> {
   ///
   Future<ChannelState> queryAroundMessage(
     String messageId, {
-    int before = 20,
-    int after = 20,
+    @Deprecated('before is deprecated, use limit instead') int before = 20,
+    @Deprecated('after is deprecated, use limit instead') int after = 20,
+    int limit = 20,
     bool preferOffline = false,
   }) =>
       channel.query(
         messagesPagination: PaginationParams(
           idAround: messageId,
-          before: before,
-          after: after,
+          limit: limit,
         ),
         preferOffline: preferOffline,
       );
@@ -338,7 +336,7 @@ class StreamChannelState extends State<StreamChannel> {
   }
 
   /// Reloads the channel with latest message
-  Future<void> reloadChannel() => _queryAtMessage(before: 30);
+  Future<void> reloadChannel() => _queryAtMessage(limit: 30);
 
   late List<Future<bool>> _futures;
 

packages/stream_chat_flutter_core/lib/src/stream_chat_core.dart

@@ -115,7 +115,7 @@ class StreamChatCoreState extends State<StreamChatCore>
   @override
   void initState() {
     super.initState();
-    WidgetsBinding.instance?.addObserver(this);
+    WidgetsBinding.instance.addObserver(this);
     _subscribeToConnectivityChange(widget.connectivityStream);
   }
 
@@ -207,7 +207,7 @@ class StreamChatCoreState extends State<StreamChatCore>
 
   @override
   void dispose() {
-    WidgetsBinding.instance?.removeObserver(this);
+    WidgetsBinding.instance.removeObserver(this);
     _unsubscribeFromConnectivityChange();
     _eventSubscription?.cancel();
     _disconnectTimer?.cancel();