Make MultiChildRenderObjectWidget const (#119195)

Author: goderbauer

dev/benchmarks/platform_views_layout/lib/main.dart

@@ -55,8 +55,8 @@ class PlatformViewLayout extends StatelessWidget {
             child: Material(
               elevation: (index % 5 + 1).toDouble(),
               color: Colors.white,
-              child: Stack(
-                children: const <Widget> [
+              child: const Stack(
+                children: <Widget> [
                   DummyPlatformView(),
                   RotationContainer(),
                 ],

dev/benchmarks/platform_views_layout_hybrid_composition/lib/main.dart

@@ -59,8 +59,8 @@ class PlatformViewLayout extends StatelessWidget {
             child: Material(
               elevation: (index % 5 + 1).toDouble(),
               color: Colors.white,
-              child: Stack(
-                children: const <Widget> [
+              child: const Stack(
+                children: <Widget> [
                   DummyPlatformView(),
                   RotationContainer(),
                 ],

dev/integration_tests/android_semantics_testing/lib/src/tests/popup_page.dart

@@ -77,9 +77,9 @@ class _PopupControlsPageState extends State<PopupControlsPage> {
                       return AlertDialog(
                         key: const ValueKey<String>(alertKeyValue),
                         title: const Text('Title text', key: ValueKey<String>('$alertKeyValue.Title')),
-                        content: SingleChildScrollView(
+                        content: const SingleChildScrollView(
                           child: ListBody(
-                            children: const <Widget>[
+                            children: <Widget>[
                               Text('Body text line 1.', key: ValueKey<String>('$alertKeyValue.Body1')),
                               Text('Body text line 2.', key: ValueKey<String>('$alertKeyValue.Body2')),
                             ],

packages/flutter/lib/src/cupertino/dialog.dart

@@ -1763,7 +1763,7 @@ class CupertinoDialogAction extends StatelessWidget {
 //
 // See [_RenderCupertinoDialogActions] for specific layout policy details.
 class _CupertinoDialogActionsRenderWidget extends MultiChildRenderObjectWidget {
-  _CupertinoDialogActionsRenderWidget({
+  const _CupertinoDialogActionsRenderWidget({
     required List<Widget> actionButtons,
     double dividerThickness = 0.0,
     bool hasCancelButton = false,

packages/flutter/lib/src/cupertino/segmented_control.dart

@@ -405,7 +405,7 @@ class _SegmentedControlState<T extends Object> extends State<CupertinoSegmentedC
 }
 
 class _SegmentedControlRenderWidget<T> extends MultiChildRenderObjectWidget {
-  _SegmentedControlRenderWidget({
+  const _SegmentedControlRenderWidget({
     super.key,
     super.children,
     required this.selectedIndex,

packages/flutter/lib/src/cupertino/sliding_segmented_control.dart

@@ -711,7 +711,7 @@ class _SegmentedControlState<T> extends State<CupertinoSlidingSegmentedControl<T
 }
 
 class _SegmentedControlRenderWidget<T> extends MultiChildRenderObjectWidget {
-  _SegmentedControlRenderWidget({
+  const _SegmentedControlRenderWidget({
     super.key,
     super.children,
     required this.highlightedIndex,

packages/flutter/lib/src/material/button_bar.dart

@@ -233,7 +233,7 @@ class ButtonBar extends StatelessWidget {
 class _ButtonBarRow extends Flex {
   /// Creates a button bar that attempts to display in a row, but displays in
   /// a column if there is insufficient horizontal space.
-  _ButtonBarRow({
+  const _ButtonBarRow({
     required super.children,
     super.mainAxisSize,
     super.mainAxisAlignment,

packages/flutter/lib/src/material/dialog.dart

@@ -302,9 +302,9 @@ class Dialog extends StatelessWidget {
 ///     builder: (BuildContext context) {
 ///       return AlertDialog(
 ///         title: const Text('AlertDialog Title'),
-///         content: SingleChildScrollView(
+///         content: const SingleChildScrollView(
 ///           child: ListBody(
-///             children: const <Widget>[
+///             children: <Widget>[
 ///               Text('This is a demo alert dialog.'),
 ///               Text('Would you like to approve of this message?'),
 ///             ],

packages/flutter/lib/src/material/dropdown_menu.dart

@@ -605,7 +605,7 @@ class _ArrowDownIntent extends Intent {
 }
 
 class _DropdownMenuBody extends MultiChildRenderObjectWidget {
-  _DropdownMenuBody({
+  const _DropdownMenuBody({
     super.key,
     super.children,
     this.width,

packages/flutter/lib/src/material/mergeable_material.dart

@@ -655,7 +655,7 @@ class _MergeableMaterialSliceKey extends GlobalKey {
 }
 
 class _MergeableMaterialListBody extends ListBody {
-  _MergeableMaterialListBody({
+  const _MergeableMaterialListBody({
     required super.children,
     super.mainAxis,
     required this.items,