Wire up autofocus for OutlineButton (#56494)

* Wireup autofocus for OutlineButton

Fixes #56493

* add test

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

@@ -175,6 +175,7 @@ class OutlineButton extends MaterialButton {
   Widget build(BuildContext context) {
     final ButtonThemeData buttonTheme = ButtonTheme.of(context);
     return _OutlineButton(
+      autofocus: autofocus,
       onPressed: onPressed,
       onLongPress: onLongPress,
       brightness: buttonTheme.getBrightness(this),
@@ -450,6 +451,7 @@ class _OutlineButtonState extends State<_OutlineButton> with SingleTickerProvide
       animation: _controller,
       builder: (BuildContext context, Widget child) {
         return RaisedButton(
+          autofocus: widget.autofocus,
           textColor: widget.textColor,
           disabledTextColor: widget.disabledTextColor,
           color: _getFillColor(),

packages/flutter/test/material/outline_button_test.dart

@@ -133,6 +133,30 @@ void main() {
     expect(inkFeatures, paints..rect(color: focusColor));
   });
 
+  testWidgets('Does OutlineButton work with autofocus', (WidgetTester tester) async {
+    const Color focusColor = Color(0xff001122);
+
+    final FocusNode focusNode = FocusNode(debugLabel: 'OutlineButton Node');
+    await tester.pumpWidget(
+      Directionality(
+        textDirection: TextDirection.ltr,
+        child: OutlineButton(
+          autofocus: true,
+          focusColor: focusColor,
+          focusNode: focusNode,
+          onPressed: () { },
+          child: const Text('button'),
+        ),
+      ),
+    );
+
+    FocusManager.instance.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
+    await tester.pumpAndSettle();
+
+    final RenderObject inkFeatures = tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
+    expect(inkFeatures, paints..rect(color: focusColor));
+  });
+
   testWidgets('OutlineButton implements debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
     OutlineButton(