[CP-stable] Revert "fixed keyboardDismissBehavior on scroll without a drag" (#161329)

Author: victorsanni

packages/flutter/lib/src/widgets/single_child_scroll_view.dart

@@ -276,7 +276,9 @@ class SingleChildScrollView extends StatelessWidget {
         child: scrollable,
         onNotification: (ScrollUpdateNotification notification) {
           final FocusScopeNode currentScope = FocusScope.of(context);
-          if (!currentScope.hasPrimaryFocus && currentScope.hasFocus) {
+          if (notification.dragDetails != null &&
+              !currentScope.hasPrimaryFocus &&
+              currentScope.hasFocus) {
             FocusManager.instance.primaryFocus?.unfocus();
           }
           return false;

packages/flutter/test/widgets/single_child_scroll_view_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui';
-
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -1120,47 +1118,4 @@ void main() {
 
     expect(tester.testTextInput.isVisible, isFalse);
   });
-
-  testWidgets('keyboardDismissBehavior on scroll without a drag test', (WidgetTester tester) async {
-    await tester.pumpWidget(MaterialApp(
-      home: Scaffold(
-        body: SizedBox(
-          height: 1000,
-          child: SingleChildScrollView(
-            keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
-            child: Column(
-              children: <Widget>[
-                Autocomplete<String>(
-                  optionsBuilder: (TextEditingValue textEditingValue) {
-                    return<String>['aardvark', 'bobcat', 'chameleon']
-                        .where((String option) {
-                      return option.contains(textEditingValue.text.toLowerCase());
-                    });
-                  },
-                ),
-                const SizedBox(height: 2000),
-              ],
-            ),
-          ),
-        ),
-      ),
-    ));
-
-    await tester.tap(find.byType(Autocomplete<String>));
-    await tester.pump();
-
-    await tester.enterText(find.byType(RawAutocomplete<String>),'aard');
-    await tester.pump();
-
-    expect(find.text('aardvark'), findsOneWidget);
-
-    final TestPointer testPointer = TestPointer(1, PointerDeviceKind.mouse);
-    final Offset scrollStart = tester.getCenter(find.byType(SingleChildScrollView));
-
-    testPointer.hover(scrollStart);
-    await tester.sendEventToBinding(testPointer.scroll(Offset(scrollStart.dx, scrollStart.dy - 100)));
-    await tester.pumpAndSettle();
-
-    expect(find.text('aardvark'), findsNothing);
-  });
 }