From c05c9f77c04143efb912ffb7e7aad6d313c9d63d Mon Sep 17 00:00:00 2001
From: chunhtai <47866232+chunhtai@users.noreply.github.com>
Date: Wed, 6 Apr 2022 09:51:35 -0700
Subject: [PATCH] Makes AutomaticKeepAlive.child non null (#101376)

---
 .../flutter/lib/src/widgets/automatic_keep_alive.dart | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/packages/flutter/lib/src/widgets/automatic_keep_alive.dart b/packages/flutter/lib/src/widgets/automatic_keep_alive.dart
index 19c7b84730..2fa5a55eeb 100644
--- a/packages/flutter/lib/src/widgets/automatic_keep_alive.dart
+++ b/packages/flutter/lib/src/widgets/automatic_keep_alive.dart
@@ -28,13 +28,13 @@ class AutomaticKeepAlive extends StatefulWidget {
   /// [KeepAlive] widget appropriately.
   const AutomaticKeepAlive({
     Key? key,
-    this.child,
+    required this.child,
   }) : super(key: key);
 
   /// The widget below this widget in the tree.
   ///
   /// {@macro flutter.widgets.ProxyWidget.child}
-  final Widget? child;
+  final Widget child;
 
   @override
   State<AutomaticKeepAlive> createState() => _AutomaticKeepAliveState();
@@ -42,7 +42,7 @@ class AutomaticKeepAlive extends StatefulWidget {
 
 class _AutomaticKeepAliveState extends State<AutomaticKeepAlive> {
   Map<Listenable, VoidCallback>? _handles;
-  Widget? _child;
+  late Widget _child;
   bool _keepingAlive = false;
 
   @override
@@ -60,7 +60,7 @@ class _AutomaticKeepAliveState extends State<AutomaticKeepAlive> {
   void _updateChild() {
     _child = NotificationListener<KeepAliveNotification>(
       onNotification: _addClient,
-      child: widget.child!,
+      child: widget.child,
     );
   }
 
@@ -228,10 +228,9 @@ class _AutomaticKeepAliveState extends State<AutomaticKeepAlive> {
 
   @override
   Widget build(BuildContext context) {
-    assert(_child != null);
     return KeepAlive(
       keepAlive: _keepingAlive,
-      child: _child!,
+      child: _child,
     );
   }