Windows: Focus text field on gaining a11y focus (#94898)

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

@@ -1160,15 +1160,14 @@ class _CupertinoTextFieldState extends State<CupertinoTextField> with Restoratio
       case TargetPlatform.android:
       case TargetPlatform.fuchsia:
       case TargetPlatform.linux:
-      case TargetPlatform.windows:
         textSelectionControls ??= cupertinoTextSelectionControls;
         break;
 
       case TargetPlatform.macOS:
+      case TargetPlatform.windows:
         textSelectionControls ??= cupertinoDesktopTextSelectionControls;
         handleDidGainAccessibilityFocus = () {
-          // macOS automatically activated the TextField when it receives
-          // accessibility focus.
+          // Automatically activate the TextField when it receives accessibility focus.
           if (!_effectiveFocusNode.hasFocus && _effectiveFocusNode.canRequestFocus) {
             _effectiveFocusNode.requestFocus();
           }

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

@@ -1197,8 +1197,7 @@ class _TextFieldState extends State<TextField> with RestorationMixin implements
         cursorRadius ??= const Radius.circular(2.0);
         cursorOffset = Offset(iOSHorizontalOffset / MediaQuery.of(context).devicePixelRatio, 0);
         handleDidGainAccessibilityFocus = () {
-          // macOS automatically activated the TextField when it receives
-          // accessibility focus.
+          // Automatically activate the TextField when it receives accessibility focus.
           if (!_effectiveFocusNode.hasFocus && _effectiveFocusNode.canRequestFocus) {
             _effectiveFocusNode.requestFocus();
           }
@@ -1216,6 +1215,14 @@ class _TextFieldState extends State<TextField> with RestorationMixin implements
         break;
 
       case TargetPlatform.linux:
+        forcePressEnabled = false;
+        textSelectionControls ??= desktopTextSelectionControls;
+        paintCursorAboveText = false;
+        cursorOpacityAnimates = false;
+        cursorColor ??= selectionTheme.cursorColor ?? theme.colorScheme.primary;
+        selectionColor = selectionTheme.selectionColor ?? theme.colorScheme.primary.withOpacity(0.40);
+        break;
+
       case TargetPlatform.windows:
         forcePressEnabled = false;
         textSelectionControls ??= desktopTextSelectionControls;
@@ -1223,6 +1230,12 @@ class _TextFieldState extends State<TextField> with RestorationMixin implements
         cursorOpacityAnimates = false;
         cursorColor ??= selectionTheme.cursorColor ?? theme.colorScheme.primary;
         selectionColor = selectionTheme.selectionColor ?? theme.colorScheme.primary.withOpacity(0.40);
+        handleDidGainAccessibilityFocus = () {
+          // Automatically activate the TextField when it receives accessibility focus.
+          if (!_effectiveFocusNode.hasFocus && _effectiveFocusNode.canRequestFocus) {
+            _effectiveFocusNode.requestFocus();
+          }
+        };
         break;
     }
 

packages/flutter/test/cupertino/text_field_test.dart

@@ -314,7 +314,7 @@ void main() {
     );
   });
 
-  testWidgets('Activates the text field when receives semantics focus on Mac', (WidgetTester tester) async {
+  testWidgets('Activates the text field when receives semantics focus on Mac, Windows', (WidgetTester tester) async {
     final SemanticsTester semantics = SemanticsTester(tester);
     final SemanticsOwner semanticsOwner = tester.binding.pipelineOwner.semanticsOwner!;
     final FocusNode focusNode = FocusNode();
@@ -362,7 +362,7 @@ void main() {
     await tester.pumpAndSettle();
     expect(focusNode.hasFocus, isTrue);
     semantics.dispose();
-  }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.macOS }));
+  }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.macOS, TargetPlatform.windows }));
 
   testWidgets(
     'takes available space horizontally and takes intrinsic space vertically no-strut',

packages/flutter/test/material/search_test.dart

@@ -629,7 +629,8 @@ void main() {
                                 debugDefaultTargetPlatformOverride != TargetPlatform.macOS) SemanticsFlag.namesRoute,
                             ],
                             actions: <SemanticsAction>[
-                              if (debugDefaultTargetPlatformOverride == TargetPlatform.macOS)
+                              if (debugDefaultTargetPlatformOverride == TargetPlatform.macOS ||
+                                debugDefaultTargetPlatformOverride == TargetPlatform.windows)
                                 SemanticsAction.didGainAccessibilityFocus,
                               SemanticsAction.tap,
                               SemanticsAction.setSelection,

packages/flutter/test/material/text_field_test.dart

@@ -286,7 +286,7 @@ void main() {
     skip: isContextMenuProvidedByPlatform, // [intended] only applies to platforms where we supply the context menu.
   );
 
-  testWidgets('Activates the text field when receives semantics focus on Mac', (WidgetTester tester) async {
+  testWidgets('Activates the text field when receives semantics focus on Mac, Windows', (WidgetTester tester) async {
     final SemanticsTester semantics = SemanticsTester(tester);
     final SemanticsOwner semanticsOwner = tester.binding.pipelineOwner.semanticsOwner!;
     final FocusNode focusNode = FocusNode();
@@ -337,7 +337,7 @@ void main() {
     await tester.pumpAndSettle();
     expect(focusNode.hasFocus, isTrue);
     semantics.dispose();
-  }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.macOS }));
+  }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.macOS, TargetPlatform.windows }));
 
   testWidgets('TextField passes onEditingComplete to EditableText', (WidgetTester tester) async {
     void onEditingComplete() { }