Don't remove view insets in removePadding ctor (#13286)

This will be followed by a patch that supports independently removing
padding and view insets.

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

@@ -158,12 +158,7 @@ class MediaQueryData {
         right: removeRight ? 0.0 : null,
         bottom: removeBottom ? 0.0 : null,
       ),
-      viewInsets: viewInsets.copyWith(
-        left: removeLeft ? 0.0 : null,
-        top: removeTop ? 0.0 : null,
-        right: removeRight ? 0.0 : null,
-        bottom: removeBottom ? 0.0 : null,
-      ),
+      viewInsets: viewInsets,
     );
   }
 

packages/flutter/test/widgets/media_query_test.dart

@@ -70,4 +70,57 @@ void main() {
     expect(copied.padding, const EdgeInsets.all(9.10938));
     expect(copied.viewInsets, const EdgeInsets.all(1.67262));
   });
+
+  testWidgets('MediaQuery.removePadding removes specified padding', (WidgetTester tester) async {
+    const Size size = const Size(2.0, 4.0);
+    const double devicePixelRatio = 2.0;
+    const double textScaleFactor = 1.2;
+    const EdgeInsets padding = const EdgeInsets.only(
+      top: 1.0,
+      right: 2.0,
+      left: 3.0,
+      bottom: 4.0,
+    );
+    const EdgeInsets viewInsets = const EdgeInsets.only(
+      top: 5.0,
+      right: 6.0,
+      left: 7.0,
+      bottom: 8.0,
+    );
+
+    MediaQueryData unpadded;
+    await tester.pumpWidget(
+      new MediaQuery(
+        data: const MediaQueryData(
+          size: size,
+          devicePixelRatio: devicePixelRatio,
+          textScaleFactor: textScaleFactor,
+          padding: padding,
+          viewInsets: viewInsets,
+        ),
+        child: new Builder(
+          builder: (BuildContext context) {
+            return new MediaQuery.removePadding(
+              context: context,
+              removeTop: true,
+              removeRight: true,
+              removeLeft: true,
+              removeBottom: true,
+              child: new Builder(
+                builder: (BuildContext context) {
+                  unpadded = MediaQuery.of(context);
+                  return new Container();
+                }
+              ),
+            );
+          }),
+      )
+    );
+
+    expect(unpadded.size, size);
+    expect(unpadded.devicePixelRatio, devicePixelRatio);
+    expect(unpadded.textScaleFactor, textScaleFactor);
+    expect(unpadded.padding, EdgeInsets.zero);
+    expect(unpadded.viewInsets, viewInsets);
+  });
 }