Hint text semantics to be excluded in a11y read out if textfield in not empty and label text is provided (#115010)

* update hint semantics

* Update input_date_picker_form_field_test.dart

Author: hannah-hyj

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

@@ -2136,7 +2136,7 @@ class _InputDecoratorState extends State<InputDecorator> with TickerProviderStat
       opacity: (isEmpty && !_hasInlineLabel) ? 1.0 : 0.0,
       duration: _kTransitionDuration,
       curve: _kTransitionCurve,
-      alwaysIncludeSemantics: true,
+      alwaysIncludeSemantics: isEmpty || (decoration.labelText == null && decoration.label == null),
       child: Text(
         hintText,
         style: hintStyle,

packages/flutter/test/material/input_date_picker_form_field_test.dart

@@ -274,7 +274,7 @@ void main() {
       await tester.pumpAndSettle();
 
       expect(tester.getSemantics(find.byType(EditableText)), matchesSemantics(
-        label: 'Enter Date\nmm/dd/yyyy',
+        label: 'Enter Date',
         isTextField: true,
         isFocused: true,
         value: '01/15/2016',

packages/flutter/test/material/text_field_test.dart

@@ -6586,7 +6586,39 @@ void main() {
     expect(tester.getBottomLeft(find.byKey(keyB)).dy, rowBottomY);
   });
 
-  testWidgets('TextField semantics include label when unfocused and label/hint when focused', (WidgetTester tester) async {
+  testWidgets('TextField semantics include label when unfocused and label/hint when focused if input is empty', (WidgetTester tester) async {
+    final SemanticsTester semantics = SemanticsTester(tester);
+    final TextEditingController controller = TextEditingController(text: '');
+    final Key key = UniqueKey();
+
+    await tester.pumpWidget(
+      overlay(
+        child: TextField(
+          key: key,
+          controller: controller,
+          decoration: const InputDecoration(
+            hintText: 'hint',
+            labelText: 'label',
+          ),
+        ),
+      ),
+    );
+
+    final SemanticsNode node = tester.getSemantics(find.byKey(key));
+
+    expect(node.label, 'label');
+    expect(node.value, '');
+
+    // Focus text field.
+    await tester.tap(find.byKey(key));
+    await tester.pump();
+
+    expect(node.label, 'label\nhint');
+    expect(node.value, '');
+    semantics.dispose();
+  });
+
+  testWidgets('TextField semantics alway include label and not hint when input value is not empty', (WidgetTester tester) async {
     final SemanticsTester semantics = SemanticsTester(tester);
     final TextEditingController controller = TextEditingController(text: 'value');
     final Key key = UniqueKey();
@@ -6613,7 +6645,7 @@ void main() {
     await tester.tap(find.byKey(key));
     await tester.pump();
 
-    expect(node.label, 'label\nhint');
+    expect(node.label, 'label');
     expect(node.value, 'value');
     semantics.dispose();
   });