Modify the control: ButtonGroup

Modifications:
1. When select=true, the middle button, like the two side buttons, will retain rounded corners.
2. When connect=true, the middle button, like the two side buttons, will retain rounded corners.

apps/gallery/.metadata

@@ -4,7 +4,7 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "d693b4b9dbac2acd4477aea4555ca6dcbea44ba2"
+  revision: "3b62efc2a3da49882f43c372e0bc53daef7295a6"
   channel: "stable"
 
 project_type: app
@@ -13,11 +13,26 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: d693b4b9dbac2acd4477aea4555ca6dcbea44ba2
-      base_revision: d693b4b9dbac2acd4477aea4555ca6dcbea44ba2
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+    - platform: android
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+    - platform: ios
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+    - platform: linux
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+    - platform: macos
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
     - platform: web
-      create_revision: d693b4b9dbac2acd4477aea4555ca6dcbea44ba2
-      base_revision: d693b4b9dbac2acd4477aea4555ca6dcbea44ba2
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+    - platform: windows
+      create_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
+      base_revision: 3b62efc2a3da49882f43c372e0bc53daef7295a6
 
   # User provided section
 

apps/gallery/pubspec_overrides.yaml

@@ -1,30 +1,30 @@
 # melos_managed_dependency_overrides: app_bar_m3e,button_group_m3e,button_m3e,fab_m3e,icon_button_m3e,loading_indicator_m3e,m3e_collection,m3e_design,navigation_bar_m3e,navigation_rail_m3e,progress_indicator_m3e,slider_m3e,split_button_m3e,toolbar_m3e
 dependency_overrides:
   app_bar_m3e:
-    path: ..\\..\\packages\\app_bar_m3e
+    path: ../../packages/app_bar_m3e
   button_group_m3e:
-    path: ..\\..\\packages\\button_group_m3e
+    path: ../../packages/button_group_m3e
   button_m3e:
-    path: ..\\..\\packages\\button_m3e
+    path: ../../packages/button_m3e
   fab_m3e:
-    path: ..\\..\\packages\\fab_m3e
+    path: ../../packages/fab_m3e
   icon_button_m3e:
-    path: ..\\..\\packages\\icon_button_m3e
+    path: ../../packages/icon_button_m3e
   loading_indicator_m3e:
-    path: ..\\..\\packages\\loading_indicator_m3e
+    path: ../../packages/loading_indicator_m3e
   m3e_collection:
-    path: ..\\..\\packages\\m3e_collection
+    path: ../../packages/m3e_collection
   m3e_design:
-    path: ..\\..\\packages\\m3e_design
+    path: ../../packages/m3e_design
   navigation_bar_m3e:
-    path: ..\\..\\packages\\navigation_bar_m3e
+    path: ../../packages/navigation_bar_m3e
   navigation_rail_m3e:
-    path: ..\\..\\packages\\navigation_rail_m3e
+    path: ../../packages/navigation_rail_m3e
   progress_indicator_m3e:
-    path: ..\\..\\packages\\progress_indicator_m3e
+    path: ../../packages/progress_indicator_m3e
   slider_m3e:
-    path: ..\\..\\packages\\slider_m3e
+    path: ../../packages/slider_m3e
   split_button_m3e:
-    path: ..\\..\\packages\\split_button_m3e
+    path: ../../packages/split_button_m3e
   toolbar_m3e:
-    path: ..\\..\\packages\\toolbar_m3e
+    path: ../../packages/toolbar_m3e

apps/gallery/test/widget_test.dart

@@ -0,0 +1,30 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:m3e_gallery/main.dart';
+
+void main() {
+  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const MyApp());
+
+    // Verify that our counter starts at 0.
+    expect(find.text('0'), findsOneWidget);
+    expect(find.text('1'), findsNothing);
+
+    // Tap the '+' icon and trigger a frame.
+    await tester.tap(find.byIcon(Icons.add));
+    await tester.pump();
+
+    // Verify that our counter has incremented.
+    expect(find.text('0'), findsNothing);
+    expect(find.text('1'), findsOneWidget);
+  });
+}