Apply media padding in UserAccountsDrawerHeader (#13619)

Applies top, left, right media padding to avoid placing content within
the safe area insets (e.g. iPhone X notch area in landscape
orientation).

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

@@ -200,6 +200,8 @@ class _UserAccountsDrawerHeaderState extends State<UserAccountsDrawerHeader> {
         color: Theme.of(context).primaryColor,
       ),
       margin: widget.margin,
+      child: new SafeArea(
+        bottom: false,
         child: new Column(
           crossAxisAlignment: CrossAxisAlignment.stretch,
           children: <Widget>[
@@ -217,6 +219,7 @@ class _UserAccountsDrawerHeaderState extends State<UserAccountsDrawerHeader> {
             ),
           ],
         ),
+      ),
     );
   }
 }

packages/flutter/test/material/user_accounts_drawer_header_test.dart

@@ -14,7 +14,16 @@ void main() {
 
     await tester.pumpWidget(
       new MaterialApp(
-        home: new Material(
+        home: new MediaQuery(
+          data: const MediaQueryData(
+            padding: const EdgeInsets.only(
+              left: 10.0,
+              top: 20.0,
+              right: 30.0,
+              bottom: 40.0,
+            ),
+          ),
+          child: new Material(
             child: new Center(
               child: new UserAccountsDrawerHeader(
                 currentAccountPicture: new CircleAvatar(
@@ -43,6 +52,7 @@ void main() {
             ),
           ),
         ),
+      ),
     );
 
     expect(find.text('A'), findsOneWidget);
@@ -62,8 +72,9 @@ void main() {
     expect(box.size.width, equals(40.0));
     expect(box.size.height, equals(40.0));
 
+    // Verify height = height + top padding + bottom margin + bottom edge)
     box = tester.renderObject(find.byType(UserAccountsDrawerHeader));
-    expect(box.size.height, equals(160.0 + 8.0 + 1.0)); // height + bottom margin + bottom edge)
+    expect(box.size.height, equals(160.0 + 20.0 + 8.0 + 1.0));
 
     final Offset topLeft = tester.getTopLeft(find.byType(UserAccountsDrawerHeader));
     final Offset topRight = tester.getTopRight(find.byType(UserAccountsDrawerHeader));
@@ -72,10 +83,10 @@ void main() {
     final Offset avatarDTopRight = tester.getTopRight(find.byKey(avatarD));
     final Offset avatarCTopRight = tester.getTopRight(find.byKey(avatarC));
 
-    expect(avatarATopLeft.dx - topLeft.dx, equals(16.0));
-    expect(avatarATopLeft.dy - topLeft.dy, equals(16.0));
-    expect(topRight.dx - avatarDTopRight.dx, equals(16.0));
-    expect(avatarDTopRight.dy - topRight.dy, equals(16.0));
+    expect(avatarATopLeft.dx - topLeft.dx, equals(16.0 + 10.0)); // left padding
+    expect(avatarATopLeft.dy - topLeft.dy, equals(16.0 + 20.0)); // add top padding
+    expect(topRight.dx - avatarDTopRight.dx, equals(16.0 + 30.0)); // right padding
+    expect(avatarDTopRight.dy - topRight.dy, equals(16.0 + 20.0)); // add top padding
     expect(avatarDTopRight.dx - avatarCTopRight.dx, equals(40.0 + 16.0)); // size + space between
   });