fix: add message search thread navigation support

Signed-off-by: xsahil03x <xdsahil@gmail.com>

packages/stream_chat_v1/lib/channel_page.dart

@@ -142,9 +142,7 @@ class _ChannelPageState extends State<ChannelPage> {
                     );
                   },
                   threadBuilder: (_, parentMessage) {
-                    return ThreadPage(
-                      parent: parentMessage,
-                    );
+                    return ThreadPage(parent: parentMessage!);
                   },
                   pinPermissions: ['owner', 'admin', 'member'],
                 ),

packages/stream_chat_v1/lib/routes/app_routes.dart

@@ -1,3 +1,4 @@
+import 'package:collection/src/iterable_extensions.dart';
 import 'package:example/channel_list_page.dart';
 import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
@@ -12,6 +13,7 @@ import '../home_page.dart';
 import '../main.dart';
 import '../new_chat_screen.dart';
 import '../new_group_chat_screen.dart';
+import '../thread_page.dart';
 import 'routes.dart';
 
 class AppRoutes {
@@ -49,17 +51,34 @@ class AppRoutes {
       case Routes.CHANNEL_PAGE:
         return MaterialPageRoute(
           settings: RouteSettings(arguments: args, name: Routes.CHANNEL_PAGE),
-            builder: (_) {
+          builder: (context) {
             final channelPageArgs = args as ChannelPageArgs;
+            final initialMessage = channelPageArgs.initialMessage;
+
             return StreamChannel(
               channel: channelPageArgs.channel!,
-                initialMessageId: channelPageArgs.initialMessage?.id,
-                child: ChannelPage(
+              initialMessageId: initialMessage?.id,
+              child: Builder(
+                builder: (context) {
+                  final parentId = initialMessage?.parentId;
+                  Message? parentMessage;
+                  if (parentId != null) {
+                    final channel = StreamChannel.of(context).channel;
+                    parentMessage = channel.state!.messages
+                        .firstWhereOrNull((it) => it.id == parentId);
+                  }
+                  if (parentMessage != null) {
+                    return ThreadPage(parent: parentMessage);
+                  }
+                  return ChannelPage(
                     highlightInitialMessage:
                         channelPageArgs.initialMessage != null,
+                  );
+                },
               ),
             );
-            });
+          },
+        );
       case Routes.NEW_CHAT:
         return MaterialPageRoute(
             settings: RouteSettings(arguments: args, name: Routes.NEW_CHAT),

packages/stream_chat_v1/lib/thread_page.dart

@@ -2,13 +2,13 @@ import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 class ThreadPage extends StatefulWidget {
-  final Message? parent;
+  final Message parent;
   final int? initialScrollIndex;
   final double? initialAlignment;
 
   ThreadPage({
     Key? key,
-    this.parent,
+    required this.parent,
     this.initialScrollIndex,
     this.initialAlignment,
   }) : super(key: key);
@@ -39,7 +39,7 @@ class _ThreadPageState extends State<ThreadPage> {
     return Scaffold(
       backgroundColor: StreamChatTheme.of(context).colorTheme.appBg,
       appBar: ThreadHeader(
-        parent: widget.parent!,
+        parent: widget.parent,
       ),
       body: Column(
         children: <Widget>[
@@ -50,6 +50,8 @@ class _ThreadPageState extends State<ThreadPage> {
               initialAlignment: widget.initialAlignment,
               onMessageSwiped: _reply,
               messageFilter: defaultFilter,
+              showScrollToBottom: false,
+              highlightInitialMessage: true,
               messageBuilder: (context, details, messages, defaultMessage) {
                 return defaultMessage.copyWith(
                   onReplyTap: _reply,
@@ -61,7 +63,7 @@ class _ThreadPageState extends State<ThreadPage> {
               pinPermissions: ['owner', 'admin', 'member'],
             ),
           ),
-          if (widget.parent!.type != 'deleted')
+          if (widget.parent.type != 'deleted')
             MessageInput(
               parentMessage: widget.parent,
               focusNode: _focusNode,