Fix focus behavior and provided thumb and focus color aren't applied to...

Fix focus behavior and provided thumb and focus color aren't applied to Cupertino variant of `Switch.adaptive` (#126688)

fixes https://github.com/flutter/flutter/issues/126637
fixes https://github.com/flutter/flutter/issues/126669

##  ~~To be merged after https://github.com/flutter/flutter/pull/126684~~

### Description

1.  Fix the Cupertino variant of `Switch.adaptive` requires two tab key presses to focus.
2.  Fix `thumbColor` & `focusColor` aren't applied.

### Before
Requires two tab presses to focus. and `thumbColor` & `focusColor` aren't applied.

https://github.com/flutter/flutter/assets/48603081/24635551-0794-443f-8320-32fdaa5de57a

### After
Single tab key to focus (no additional focus node) and `thumbColor` & `focusColor` are applied.

https://github.com/flutter/flutter/assets/48603081/9bf42fd8-c7e0-475a-b933-192a94650b0c

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

@@ -570,22 +570,22 @@ class Switch extends StatelessWidget {
 
   Widget _buildCupertinoSwitch(BuildContext context) {
     final Size size = _getSwitchSize(context);
-    return Focus(
-      focusNode: focusNode,
-      onFocusChange: onFocusChange,
-      autofocus: autofocus,
-      child: Container(
-        width: size.width, // Same size as the Material switch.
-        height: size.height,
-        alignment: Alignment.center,
-        child: CupertinoSwitch(
-          dragStartBehavior: dragStartBehavior,
-          value: value,
-          onChanged: onChanged,
-          activeColor: activeColor,
-          trackColor: inactiveTrackColor,
-          applyTheme: applyCupertinoTheme,
-        ),
+    return Container(
+      width: size.width, // Same size as the Material switch.
+      height: size.height,
+      alignment: Alignment.center,
+      child: CupertinoSwitch(
+        dragStartBehavior: dragStartBehavior,
+        value: value,
+        onChanged: onChanged,
+        activeColor: activeColor,
+        trackColor: inactiveTrackColor,
+        thumbColor: thumbColor?.resolve(<MaterialState>{}),
+        applyTheme: applyCupertinoTheme,
+        focusColor: focusColor,
+        focusNode: focusNode,
+        onFocusChange: onFocusChange,
+        autofocus: autofocus,
       ),
     );
   }

packages/flutter/test/material/switch_test.dart

@@ -791,7 +791,10 @@ void main() {
 
   testWidgets('Switch.adaptive', (WidgetTester tester) async {
     bool value = false;
-    const Color inactiveTrackColor = Colors.pink;
+    const Color activeTrackColor =  Color(0xffff1200);
+    const Color inactiveTrackColor =  Color(0xffff12ff);
+    const Color thumbColor = Color(0xffffff00);
+    const Color focusColor = Color(0xff00ff00);
 
     Widget buildFrame(TargetPlatform platform) {
       return MaterialApp(
@@ -802,7 +805,10 @@ void main() {
               child: Center(
                 child: Switch.adaptive(
                   value: value,
+                  activeColor: activeTrackColor,
                   inactiveTrackColor: inactiveTrackColor,
+                  thumbColor: const MaterialStatePropertyAll<Color?>(thumbColor),
+                  focusColor: focusColor,
                   onChanged: (bool newValue) {
                     setState(() {
                       value = newValue;
@@ -822,7 +828,10 @@ void main() {
       expect(find.byType(CupertinoSwitch), findsOneWidget, reason: 'on ${platform.name}');
 
       final CupertinoSwitch adaptiveSwitch = tester.widget(find.byType(CupertinoSwitch));
+      expect(adaptiveSwitch.activeColor, activeTrackColor, reason: 'on ${platform.name}');
       expect(adaptiveSwitch.trackColor, inactiveTrackColor, reason: 'on ${platform.name}');
+      expect(adaptiveSwitch.thumbColor, thumbColor, reason: 'on ${platform.name}');
+      expect(adaptiveSwitch.focusColor, focusColor, reason: 'on ${platform.name}');
 
       expect(value, isFalse, reason: 'on ${platform.name}');
       await tester.tap(find.byType(Switch));
@@ -3278,6 +3287,89 @@ void main() {
       );
     });
   });
+
+  testWidgets('Switch.adaptive(Cupertino) is focusable and has correct focus color', (WidgetTester tester) async {
+    final FocusNode focusNode = FocusNode(debugLabel: 'Switch.adaptive');
+    tester.binding.focusManager.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
+    bool value = true;
+    const Color focusColor = Color(0xffff0000);
+
+    Widget buildApp({bool enabled = true}) {
+      return MaterialApp(
+        theme: ThemeData(platform: TargetPlatform.iOS),
+        home: Material(
+          child: StatefulBuilder(
+            builder: (BuildContext context, StateSetter setState) {
+              return Center(
+                child: Switch.adaptive(
+                  value: value,
+                  onChanged: enabled ? (bool newValue) {
+                    setState(() {
+                      value = newValue;
+                    });
+                  } : null,
+                  focusColor: focusColor,
+                  focusNode: focusNode,
+                  autofocus: true,
+                ),
+              );
+            },
+          ),
+        ),
+      );
+    }
+
+    await tester.pumpWidget(buildApp());
+    await tester.pumpAndSettle();
+
+    expect(focusNode.hasPrimaryFocus, isTrue);
+    expect(
+      find.byType(CupertinoSwitch),
+      paints
+        ..rrect(color: const Color(0xff34c759))
+        ..rrect(color: focusColor)
+        ..clipRRect()
+        ..rrect(color: const Color(0x26000000))
+        ..rrect(color: const Color(0x0f000000))
+        ..rrect(color: const Color(0x0a000000))
+        ..rrect(color: const Color(0xffffffff)),
+    );
+
+    // Check the false value.
+    value = false;
+    await tester.pumpWidget(buildApp());
+    await tester.pumpAndSettle();
+
+    expect(focusNode.hasPrimaryFocus, isTrue);
+    expect(
+      find.byType(CupertinoSwitch),
+      paints
+        ..rrect(color: const Color(0x28787880))
+        ..rrect(color: focusColor)
+        ..clipRRect()
+        ..rrect(color: const Color(0x26000000))
+        ..rrect(color: const Color(0x0f000000))
+        ..rrect(color: const Color(0x0a000000))
+        ..rrect(color: const Color(0xffffffff)),
+    );
+
+    // Check what happens when disabled.
+    value = false;
+    await tester.pumpWidget(buildApp(enabled: false));
+    await tester.pumpAndSettle();
+
+    expect(focusNode.hasPrimaryFocus, isFalse);
+    expect(
+      find.byType(CupertinoSwitch),
+      paints
+        ..rrect(color: const Color(0x28787880))
+        ..clipRRect()
+        ..rrect(color: const Color(0x26000000))
+        ..rrect(color: const Color(0x0f000000))
+        ..rrect(color: const Color(0x0a000000))
+        ..rrect(color: const Color(0xffffffff)),
+    );
+  });
 }
 
 class DelayedImageProvider extends ImageProvider<DelayedImageProvider> {