Set Semantics.button to true for date widget (#128824)

Fixes #127863

This PR is to set `Semantics.button` to true for date widget in `DatePicker`.

https://github.com/flutter/flutter/assets/36861262/b366f25a-6bf3-4e3f-b944-ab71197b73e5

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

@@ -1013,6 +1013,8 @@ class _DayPickerState extends State<_DayPicker> {
               // for the day of month. To do that we prepend day of month to the
               // formatted full date.
               label: '${localizations.formatDecimal(day)}, ${localizations.formatFullDate(dayToBuild)}$semanticLabelSuffix',
+              // Set button to true to make the date selectable.
+              button: true,
               selected: isSelectedDay,
               excludeSemantics: true,
               child: dayWidget,

packages/flutter/test/material/calendar_date_picker_test.dart

@@ -688,152 +688,182 @@ void main() {
         // Day grid.
         expect(tester.getSemantics(find.text('1')), matchesSemantics(
           label: '1, Friday, January 1, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('2')), matchesSemantics(
           label: '2, Saturday, January 2, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('3')), matchesSemantics(
           label: '3, Sunday, January 3, 2016, Today',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('4')), matchesSemantics(
           label: '4, Monday, January 4, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('5')), matchesSemantics(
           label: '5, Tuesday, January 5, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('6')), matchesSemantics(
           label: '6, Wednesday, January 6, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('7')), matchesSemantics(
           label: '7, Thursday, January 7, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('8')), matchesSemantics(
           label: '8, Friday, January 8, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('9')), matchesSemantics(
           label: '9, Saturday, January 9, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('10')), matchesSemantics(
           label: '10, Sunday, January 10, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('11')), matchesSemantics(
           label: '11, Monday, January 11, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('12')), matchesSemantics(
           label: '12, Tuesday, January 12, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('13')), matchesSemantics(
           label: '13, Wednesday, January 13, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('14')), matchesSemantics(
           label: '14, Thursday, January 14, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('15')), matchesSemantics(
           label: '15, Friday, January 15, 2016',
+          isButton: true,
           hasTapAction: true,
           isSelected: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('16')), matchesSemantics(
           label: '16, Saturday, January 16, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('17')), matchesSemantics(
           label: '17, Sunday, January 17, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('18')), matchesSemantics(
           label: '18, Monday, January 18, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('19')), matchesSemantics(
           label: '19, Tuesday, January 19, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('20')), matchesSemantics(
           label: '20, Wednesday, January 20, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('21')), matchesSemantics(
           label: '21, Thursday, January 21, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('22')), matchesSemantics(
           label: '22, Friday, January 22, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('23')), matchesSemantics(
           label: '23, Saturday, January 23, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('24')), matchesSemantics(
           label: '24, Sunday, January 24, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('25')), matchesSemantics(
           label: '25, Monday, January 25, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('26')), matchesSemantics(
           label: '26, Tuesday, January 26, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('27')), matchesSemantics(
           label: '27, Wednesday, January 27, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('28')), matchesSemantics(
           label: '28, Thursday, January 28, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('29')), matchesSemantics(
           label: '29, Friday, January 29, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('30')), matchesSemantics(
           label: '30, Saturday, January 30, 2016',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));

packages/flutter/test/material/date_picker_test.dart

@@ -1268,6 +1268,7 @@ void main() {
 
         expect(tester.getSemantics(find.text('3')), matchesSemantics(
           label: '3, Sunday, January 3, 2016, Today',
+          isButton: true,
           hasTapAction: true,
           isFocusable: true,
         ));