Reset autovalidate in the text input form field of the Date Picker when...

Reset autovalidate in the text input form field of the Date Picker when switching back to input mode from calendar mode. (#53434)

packages/flutter/lib/src/material/pickers/date_picker_dialog.dart

@@ -296,6 +296,7 @@ class _DatePickerDialogState extends State<_DatePickerDialog> {
     setState(() {
       switch (_entryMode) {
         case DatePickerEntryMode.calendar:
+          _autoValidate = false;
           _entryMode = DatePickerEntryMode.input;
           break;
         case DatePickerEntryMode.input:

packages/flutter/test/material/date_picker_test.dart

@@ -136,6 +136,30 @@ void main() {
       });
     });
 
+    testWidgets('Switching to input mode resets input error state', (WidgetTester tester) async {
+      await prepareDatePicker(tester, (Future<DateTime> date) async {
+        // Enter text input mode and type an invalid date to get error.
+        await tester.tap(find.byIcon(Icons.edit));
+        await tester.pumpAndSettle();
+        await tester.enterText(find.byType(TextField), '1234567');
+        await tester.tap(find.text('OK'));
+        await tester.pumpAndSettle();
+        expect(find.text('Invalid format.'), findsOneWidget);
+
+        // Toggle to calender mode and then back to input mode
+        await tester.tap(find.byIcon(Icons.calendar_today));
+        await tester.pumpAndSettle();
+        await tester.tap(find.byIcon(Icons.edit));
+        await tester.pumpAndSettle();
+        expect(find.text('Invalid format.'), findsNothing);
+
+        // Edit the text, the error should not be showing until ok is tapped
+        await tester.enterText(find.byType(TextField), '1234567');
+        await tester.pumpAndSettle();
+        expect(find.text('Invalid format.'), findsNothing);
+      });
+    });
+
     testWidgets('builder parameter', (WidgetTester tester) async {
       Widget buildFrame(TextDirection textDirection) {
         return MaterialApp(