[various] prepare for more const widgets (#7074)

Author: goderbauer

packages/google_maps_flutter/google_maps_flutter/test/map_creation_test.dart

@@ -29,8 +29,12 @@ void main() {
   ) async {
     // Inject two map widgets...
     await tester.pumpWidget(
+      // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+      // ignore: prefer_const_constructors
       Directionality(
         textDirection: TextDirection.ltr,
+        // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+        // ignore: prefer_const_constructors
         child: Column(
           children: const <Widget>[
             GoogleMap(

packages/local_auth/local_auth/example/lib/main.dart

@@ -183,6 +183,8 @@ class _MyAppState extends State<MyApp> {
                 if (_isAuthenticating)
                   ElevatedButton(
                     onPressed: _cancelAuthentication,
+                    // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                    // ignore: prefer_const_constructors
                     child: Row(
                       mainAxisSize: MainAxisSize.min,
                       children: const <Widget>[
@@ -196,6 +198,8 @@ class _MyAppState extends State<MyApp> {
                     children: <Widget>[
                       ElevatedButton(
                         onPressed: _authenticate,
+                        // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                        // ignore: prefer_const_constructors
                         child: Row(
                           mainAxisSize: MainAxisSize.min,
                           children: const <Widget>[

packages/local_auth/local_auth_android/example/lib/main.dart

@@ -188,6 +188,8 @@ class _MyAppState extends State<MyApp> {
                 if (_isAuthenticating)
                   ElevatedButton(
                     onPressed: _cancelAuthentication,
+                    // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                    // ignore: prefer_const_constructors
                     child: Row(
                       mainAxisSize: MainAxisSize.min,
                       children: const <Widget>[
@@ -201,6 +203,8 @@ class _MyAppState extends State<MyApp> {
                     children: <Widget>[
                       ElevatedButton(
                         onPressed: _authenticate,
+                        // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                        // ignore: prefer_const_constructors
                         child: Row(
                           mainAxisSize: MainAxisSize.min,
                           children: const <Widget>[

packages/local_auth/local_auth_ios/example/lib/main.dart

@@ -187,6 +187,8 @@ class _MyAppState extends State<MyApp> {
                 if (_isAuthenticating)
                   ElevatedButton(
                     onPressed: _cancelAuthentication,
+                    // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                    // ignore: prefer_const_constructors
                     child: Row(
                       mainAxisSize: MainAxisSize.min,
                       children: const <Widget>[
@@ -200,6 +202,8 @@ class _MyAppState extends State<MyApp> {
                     children: <Widget>[
                       ElevatedButton(
                         onPressed: _authenticate,
+                        // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                        // ignore: prefer_const_constructors
                         child: Row(
                           mainAxisSize: MainAxisSize.min,
                           children: const <Widget>[

packages/local_auth/local_auth_windows/example/lib/main.dart

@@ -150,6 +150,8 @@ class _MyAppState extends State<MyApp> {
                 if (_isAuthenticating)
                   ElevatedButton(
                     onPressed: _cancelAuthentication,
+                    // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                    // ignore: prefer_const_constructors
                     child: Row(
                       mainAxisSize: MainAxisSize.min,
                       children: const <Widget>[
@@ -163,6 +165,8 @@ class _MyAppState extends State<MyApp> {
                     children: <Widget>[
                       ElevatedButton(
                         onPressed: _authenticate,
+                        // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+                        // ignore: prefer_const_constructors
                         child: Row(
                           mainAxisSize: MainAxisSize.min,
                           children: const <Widget>[

packages/url_launcher/url_launcher/example/lib/encoding.dart

@@ -22,8 +22,14 @@ String? encodeQueryParameters(Map<String, String> params) {
 // #enddocregion encode-query-parameters
 
 void main() => runApp(
+      // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+      // ignore: prefer_const_constructors
       MaterialApp(
+        // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+        // ignore: prefer_const_constructors
         home: Material(
+          // TODO(goderbauer): Make this const when this package requires Flutter 3.8 or later.
+          // ignore: prefer_const_constructors
           child: Column(
             mainAxisAlignment: MainAxisAlignment.spaceEvenly,
             children: const <Widget>[