some formatting of map, parameters and spaces (#29760)

examples/catalog/lib/custom_a11y_traversal.dart

@@ -61,14 +61,15 @@ class RowColumnTraversal extends StatelessWidget {
 /// A Button class that wraps an [IconButton] with a [RowColumnTraversal] to
 /// set its traversal order.
 class SpinnerButton extends StatelessWidget {
-  const SpinnerButton(
+  const SpinnerButton({
-      {Key key,
+    Key key,
     this.onPressed,
     this.icon,
     this.rowOrder,
     this.columnOrder,
     this.field,
-      this.increment}) : super(key: key);
+    this.increment,
+  }) : super(key: key);
 
   final VoidCallback onPressed;
   final IconData icon;

examples/catalog/test/custom_semantics_test.dart

@@ -91,7 +91,8 @@ void main() {
   });
 }
 
-void expectAdjustable(SemanticsNode node, {
+void expectAdjustable(
+  SemanticsNode node, {
   bool hasIncreaseAction = true,
   bool hasDecreaseAction = true,
   String label = '',

examples/flutter_gallery/lib/demo/material/date_and_time_picker_demo.dart

@@ -16,7 +16,8 @@ class _InputDropdown extends StatelessWidget {
     this.labelText,
     this.valueText,
     this.valueStyle,
-    this.onPressed }) : super(key: key);
+    this.onPressed,
+  }) : super(key: key);
 
   final String labelText;
   final String valueText;

examples/flutter_gallery/lib/demo/shrine/expanding_bottom_sheet.dart

@@ -71,7 +71,8 @@ Animation<T> _getEmphasizedEasingAnimation<T>({
   @required T peak,
   @required T end,
   @required bool isForward,
-  @required Animation<double> parent}) {
+  @required Animation<double> parent,
+}) {
   Curve firstCurve;
   Curve secondCurve;
   double firstWeight;

examples/flutter_gallery/lib/demo/video_demo.dart

@@ -50,8 +50,11 @@ class VideoCard extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    Widget fullScreenRoutePageBuilder(BuildContext context,
+    Widget fullScreenRoutePageBuilder(
-        Animation<double> animation, Animation<double> secondaryAnimation) {
+      BuildContext context,
+      Animation<double> animation,
+      Animation<double> secondaryAnimation,
+    ) {
       return _buildFullScreenVideo();
     }
 

examples/flutter_gallery/lib/gallery/backdrop.dart

@@ -24,7 +24,8 @@ final Animatable<BorderRadius> _kFrontHeadingBevelRadius = BorderRadiusTween(
 );
 
 class _TappableWhileStatusIs extends StatefulWidget {
-  const _TappableWhileStatusIs(this.status, {
+  const _TappableWhileStatusIs(
+    this.status, {
     Key key,
     this.controller,
     this.child,

examples/layers/rendering/src/sector_layout.dart

@@ -57,9 +57,10 @@ class SectorDimensions {
   const SectorDimensions({ this.deltaRadius = 0.0, this.deltaTheta = 0.0 });
 
   factory SectorDimensions.withConstraints(
-    SectorConstraints constraints,
+    SectorConstraints constraints, {
-    { double deltaRadius = 0.0, double deltaTheta = 0.0, }
+    double deltaRadius = 0.0,
-  ) {
+    double deltaTheta = 0.0,
+  }) {
     return SectorDimensions(
       deltaRadius: constraints.constrainDeltaRadius(deltaRadius),
       deltaTheta: constraints.constrainDeltaTheta(deltaTheta),
@@ -554,7 +555,8 @@ class RenderBoxToRenderSectorAdapter extends RenderBox with RenderObjectWithChil
 }
 
 class RenderSolidColor extends RenderDecoratedSector {
-  RenderSolidColor(this.backgroundColor, {
+  RenderSolidColor(
+    this.backgroundColor, {
     this.desiredDeltaRadius = double.infinity,
     this.desiredDeltaTheta = kTwoPi,
   }) : super(BoxDecoration(color: backgroundColor));

packages/flutter/lib/src/foundation/diagnostics.dart

@@ -1045,7 +1045,9 @@ class MessageProperty extends DiagnosticsProperty<void> {
   /// message is stored as the description.
   ///
   /// The [name], `message`, and [level] arguments must not be null.
-  MessageProperty(String name, String message, {
+  MessageProperty(
+    String name,
+    String message, {
     DiagnosticLevel level = DiagnosticLevel.info,
   }) : assert(name != null),
        assert(message != null),
@@ -1063,7 +1065,9 @@ class StringProperty extends DiagnosticsProperty<String> {
   /// Create a diagnostics property for strings.
   ///
   /// The [showName], [quoted], and [level] arguments must not be null.
-  StringProperty(String name, String value, {
+  StringProperty(
+    String name,
+    String value, {
     String description,
     String tooltip,
     bool showName = true,
@@ -1119,7 +1123,8 @@ class StringProperty extends DiagnosticsProperty<String> {
 }
 
 abstract class _NumProperty<T extends num> extends DiagnosticsProperty<T> {
-  _NumProperty(String name,
+  _NumProperty(
+    String name,
     T value, {
     String ifNull,
     this.unit,
@@ -1137,7 +1142,8 @@ abstract class _NumProperty<T extends num> extends DiagnosticsProperty<T> {
     level: level,
   );
 
-  _NumProperty.lazy(String name,
+  _NumProperty.lazy(
+    String name,
     ComputePropertyValueCallback<T> computeValue, {
     String ifNull,
     this.unit,
@@ -1190,7 +1196,9 @@ class DoubleProperty extends _NumProperty<double> {
   /// If specified, [unit] describes the unit for the [value] (e.g. px).
   ///
   /// The [showName] and [level] arguments must not be null.
-  DoubleProperty(String name, double value, {
+  DoubleProperty(
+    String name,
+    double value, {
     String ifNull,
     String unit,
     String tooltip,
@@ -1249,7 +1257,9 @@ class IntProperty extends _NumProperty<int> {
   /// Create a diagnostics property for integers.
   ///
   /// The [showName] and [level] arguments must not be null.
-  IntProperty(String name, int value, {
+  IntProperty(
+    String name,
+    int value, {
     String ifNull,
     bool showName = true,
     String unit,
@@ -1282,7 +1292,9 @@ class PercentProperty extends DoubleProperty {
   /// be sufficient to disambiguate its meaning.
   ///
   /// The [showName] and [level] arguments must not be null.
-  PercentProperty(String name, double fraction, {
+  PercentProperty(
+    String name,
+    double fraction, {
     String ifNull,
     bool showName = true,
     String tooltip,
@@ -1361,7 +1373,8 @@ class FlagProperty extends DiagnosticsProperty<bool> {
   /// be descriptions that make the property name redundant.
   ///
   /// The [showName] and [level] arguments must not be null.
-  FlagProperty(String name, {
+  FlagProperty(
+    String name, {
     @required bool value,
     this.ifTrue,
     this.ifFalse,
@@ -1456,7 +1469,9 @@ class IterableProperty<T> extends DiagnosticsProperty<Iterable<T>> {
   /// interesting to display.
   ///
   /// The [style], [showName], and [level] arguments must not be null.
-  IterableProperty(String name, Iterable<T> value, {
+  IterableProperty(
+    String name,
+    Iterable<T> value, {
     Object defaultValue = kNoDefaultValue,
     String ifNull,
     String ifEmpty = '[]',
@@ -1531,7 +1546,9 @@ class EnumProperty<T> extends DiagnosticsProperty<T> {
   /// Create a diagnostics property that displays an enum.
   ///
   /// The [level] argument must also not be null.
-  EnumProperty(String name, T value, {
+  EnumProperty(
+    String name,
+    T value, {
     Object defaultValue = kNoDefaultValue,
     DiagnosticLevel level  = DiagnosticLevel.info,
   }) : assert(level != null),
@@ -1575,7 +1592,9 @@ class ObjectFlagProperty<T> extends DiagnosticsProperty<T> {
   ///
   /// The [showName] and [level] arguments must not be null. Additionally, at
   /// least one of [ifPresent] and [ifNull] must not be null.
-  ObjectFlagProperty(String name, T value, {
+  ObjectFlagProperty(
+    String name,
+    T value, {
     this.ifPresent,
     String ifNull,
     bool showName = false,

packages/flutter/lib/src/gestures/pointer_signal_resolver.dart

@@ -59,7 +59,7 @@ class PointerSignalResolver {
         informationCollector: (StringBuffer information) {
           information.writeln('Event:');
           information.write('  $event');
-        }
+        },
       ));
     }
     _firstRegisteredCallback = null;

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

@@ -162,7 +162,8 @@ class DataCell {
   /// If the cell has no data, then a [Text] widget with placeholder
   /// text should be provided instead, and then the [placeholder]
   /// argument should be set to true.
-  const DataCell(this.child, {
+  const DataCell(
+    this.child, {
     this.placeholder = false,
     this.showEditIcon = false,
     this.onTap,

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

@@ -47,15 +47,13 @@ abstract class InteractiveInkFeature extends InkFeature {
   ///
   /// Typically causes the ink to propagate faster across the material. By default this
   /// method does nothing.
-  void confirm() {
+  void confirm() { }
-  }
 
   /// Called when the user input that triggered this feature's appearance was canceled.
   ///
   /// Typically causes the ink to gradually disappear. By default this method does
   /// nothing.
-  void cancel() {
+  void cancel() { }
-  }
 
   /// The ink's color.
   Color get color => _color;

packages/flutter/lib/src/painting/image_provider.dart

@@ -736,7 +736,8 @@ class ExactAssetImage extends AssetBundleImageProvider {
   /// The [package] argument must be non-null when fetching an asset that is
   /// included in a package. See the documentation for the [ExactAssetImage] class
   /// itself for details.
-  const ExactAssetImage(this.assetName, {
+  const ExactAssetImage(
+    this.assetName, {
     this.scale = 1.0,
     this.bundle,
     this.package,

packages/flutter/lib/src/painting/image_resolution.dart

@@ -128,7 +128,8 @@ class AssetImage extends AssetBundleImageProvider {
   /// from the set of images to choose from. The [package] argument must be
   /// non-null when fetching an asset that is included in package. See the
   /// documentation for the [AssetImage] class itself for details.
-  const AssetImage(this.assetName, {
+  const AssetImage(
+    this.assetName, {
     this.bundle,
     this.package,
   }) : assert(assetName != null);

packages/flutter/lib/src/painting/matrix_utils.dart

@@ -265,7 +265,9 @@ class TransformProperty extends DiagnosticsProperty<Matrix4> {
   /// Create a diagnostics property for [Matrix4] objects.
   ///
   /// The [showName] and [level] arguments must not be null.
-  TransformProperty(String name, Matrix4 value, {
+  TransformProperty(
+    String name,
+    Matrix4 value, {
     bool showName = true,
     Object defaultValue = kNoDefaultValue,
     DiagnosticLevel level = DiagnosticLevel.info,

packages/flutter/lib/src/painting/strut_style.dart

@@ -302,7 +302,8 @@ class StrutStyle extends Diagnosticable {
   /// is inherited by being prepended onto the font family names. If
   /// [fontFamilyFallback] is meant to be empty, pass an empty list instead of null.
   /// This prevents the previous package name from being prepended twice.
-  StrutStyle.fromTextStyle(TextStyle textStyle, {
+  StrutStyle.fromTextStyle(
+    TextStyle textStyle, {
     String fontFamily,
     List<String> fontFamilyFallback,
     double fontSize,

packages/flutter/lib/src/physics/clamped_simulation.dart

@@ -21,7 +21,8 @@ class ClampedSimulation extends Simulation {
   ///
   /// The named arguments specify the ranges for the clamping behavior, as
   /// applied to [x] and [dx].
-  ClampedSimulation(this.simulation, {
+  ClampedSimulation(
+    this.simulation, {
     this.xMin = double.negativeInfinity,
     this.xMax = double.infinity,
     this.dxMin = double.negativeInfinity,

packages/flutter/lib/src/physics/friction_simulation.dart

@@ -18,7 +18,10 @@ class FrictionSimulation extends Simulation {
   /// drag coefficient, a unitless value; the initial position, in the same
   /// length units as used for [x]; and the initial velocity, in the same
   /// velocity units as used for [dx].
-  FrictionSimulation(double drag, double position, double velocity, {
+  FrictionSimulation(
+    double drag,
+    double position,
+    double velocity, {
     Tolerance tolerance = Tolerance.defaultTolerance,
   }) : _drag = drag,
        _dragLog = math.log(drag),

packages/flutter/lib/src/rendering/editable.dart

@@ -300,14 +300,14 @@ class RenderEditable extends RenderBox {
 
     final Offset startOffset = _textPainter.getOffsetForCaret(
       TextPosition(offset: _selection.start, affinity: _selection.affinity),
-      Rect.zero
+      Rect.zero,
     );
 
     _selectionStartInViewport.value = visibleRegion.contains(startOffset + effectiveOffset);
 
     final Offset endOffset =  _textPainter.getOffsetForCaret(
       TextPosition(offset: _selection.end, affinity: _selection.affinity),
-      Rect.zero
+      Rect.zero,
     );
 
     _selectionEndInViewport.value = visibleRegion.contains(endOffset + effectiveOffset);

packages/flutter/lib/src/rendering/paragraph.dart

@@ -41,7 +41,8 @@ class RenderParagraph extends RenderBox {
   ///
   /// The [maxLines] property may be null (and indeed defaults to null), but if
   /// it is not null, it must be greater than zero.
-  RenderParagraph(TextSpan text, {
+  RenderParagraph(
+    TextSpan text, {
     TextAlign textAlign = TextAlign.start,
     @required TextDirection textDirection,
     bool softWrap = true,

packages/flutter/lib/src/rendering/sliver.dart

@@ -773,7 +773,8 @@ class SliverHitTestEntry extends HitTestEntry {
   /// Creates a sliver hit test entry.
   ///
   /// The [mainAxisPosition] and [crossAxisPosition] arguments must not be null.
-  const SliverHitTestEntry(RenderSliver target, {
+  const SliverHitTestEntry(
+    RenderSliver target, {
     @required this.mainAxisPosition,
     @required this.crossAxisPosition,
   }) : assert(mainAxisPosition != null),

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

@@ -48,7 +48,8 @@ class Icon extends StatelessWidget {
   /// Creates an icon.
   ///
   /// The [size] and [color] default to the value given by the current [IconTheme].
-  const Icon(this.icon, {
+  const Icon(
+    this.icon, {
     Key key,
     this.size,
     this.color,

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

@@ -195,7 +195,8 @@ class Image extends StatefulWidget {
   /// [FilterQuality.none] which corresponds to nearest-neighbor.
   ///
   /// If [excludeFromSemantics] is true, then [semanticLabel] will be ignored.
-  Image.network(String src, {
+  Image.network(
+    String src, {
     Key key,
     double scale = 1.0,
     this.semanticLabel,
@@ -236,7 +237,8 @@ class Image extends StatefulWidget {
   /// [FilterQuality.none] which corresponds to nearest-neighbor.
   ///
   /// If [excludeFromSemantics] is true, then [semanticLabel] will be ignored.
-  Image.file(File file, {
+  Image.file(
+    File file, {
     Key key,
     double scale = 1.0,
     this.semanticLabel,
@@ -384,7 +386,8 @@ class Image extends StatefulWidget {
   ///    scale is present.
   ///  * <https://flutter.io/assets-and-images/>, an introduction to assets in
   ///    Flutter.
-  Image.asset(String name, {
+  Image.asset(
+    String name, {
     Key key,
     AssetBundle bundle,
     this.semanticLabel,
@@ -425,7 +428,8 @@ class Image extends StatefulWidget {
   /// [FilterQuality.none] which corresponds to nearest-neighbor.
   ///
   /// If [excludeFromSemantics] is true, then [semanticLabel] will be ignored.
-  Image.memory(Uint8List bytes, {
+  Image.memory(
+    Uint8List bytes, {
     Key key,
     double scale = 1.0,
     this.semanticLabel,

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

@@ -23,7 +23,8 @@ class ImageIcon extends StatelessWidget {
   /// Creates an image icon.
   ///
   /// The [size] and [color] default to the value given by the current [IconTheme].
-  const ImageIcon(this.image, {
+  const ImageIcon(
+    this.image, {
     Key key,
     this.size,
     this.color,

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

@@ -844,7 +844,8 @@ class _NestedScrollCoordinator implements ScrollActivityDelegate, ScrollHoldCont
 }
 
 class _NestedScrollController extends ScrollController {
-  _NestedScrollController(this.coordinator, {
+  _NestedScrollController(
+    this.coordinator, {
     double initialScrollOffset = 0.0,
     String debugLabel,
   }) : super(initialScrollOffset: initialScrollOffset, debugLabel: debugLabel);

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

@@ -36,11 +36,12 @@ class PerformanceOverlay extends LeafRenderObjectWidget {
   }) : super(key: key);
 
   /// Create a performance overlay that displays all available statistics
-  PerformanceOverlay.allEnabled({ Key key,
+  PerformanceOverlay.allEnabled({
+    Key key,
     this.rasterizerThreshold = 0,
     this.checkerboardRasterCacheImages = false,
-                                  this.checkerboardOffscreenLayers = false })
+    this.checkerboardOffscreenLayers = false,
-    : optionsMask =
+  }) : optionsMask =
         1 << PerformanceOverlayOption.displayRasterizerStatistics.index |
         1 << PerformanceOverlayOption.visualizeRasterizerStatistics.index |
         1 << PerformanceOverlayOption.displayEngineStatistics.index |

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

@@ -224,7 +224,8 @@ class Text extends StatelessWidget {
   /// closest enclosing [DefaultTextStyle].
   ///
   /// The [data] parameter must not be null.
-  const Text(this.data, {
+  const Text(
+    this.data, {
     Key key,
     this.style,
     this.strutStyle,
@@ -246,7 +247,8 @@ class Text extends StatelessWidget {
   /// Creates a text widget with a [TextSpan].
   ///
   /// The [textSpan] parameter must not be null.
-  const Text.rich(this.textSpan, {
+  const Text.rich(
+    this.textSpan, {
     Key key,
     this.style,
     this.strutStyle,

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

@@ -640,7 +640,7 @@ class _TextSelectionHandleOverlayState
             ],
           ),
         ),
-      )
+      ),
     );
   }
 

packages/flutter/test/cupertino/route_test.dart

@@ -348,7 +348,7 @@ void main() {
                           onPressed: () {
                             Navigator.pop<void>(context);
                           },
-                        )
+                        ),
                       ],
                     );
                   },

packages/flutter/test/material/radio_test.dart

@@ -267,7 +267,7 @@ void main() {
                 groupValue: 1,
                 onChanged: (int value) { },
               ),
-            )
+            ),
           ),
         ),
       ),

packages/flutter/test/material/tab_bar_theme_test.dart

@@ -26,7 +26,10 @@ final List<SizedBox> _sizedTabs = <SizedBox>[
 ];
 
 Widget _withTheme(
-  TabBarTheme theme, { List<Widget> tabs = _tabs, bool isScrollable = false }) {
+  TabBarTheme theme, {
+  List<Widget> tabs = _tabs,
+  bool isScrollable = false,
+}) {
   return MaterialApp(
     theme: ThemeData(tabBarTheme: theme),
     home: Scaffold(
@@ -102,7 +105,7 @@ void main() {
     const double indicatorWeight = 2.0; // default value
 
     const EdgeInsetsGeometry labelPadding = EdgeInsets.fromLTRB(
-      leftPadding, topPadding, rightPadding, bottomPadding
+      leftPadding, topPadding, rightPadding, bottomPadding,
     );
 
     const TabBarTheme tabBarTheme = TabBarTheme(labelPadding: labelPadding);

packages/flutter/test/material/theme_test.dart

@@ -741,7 +741,7 @@ class _TextStyleProxy implements TextStyle {
     double wordSpacingFactor = 1.0,
     double wordSpacingDelta = 0.0,
     double heightFactor = 1.0,
-    double heightDelta = 0.0
+    double heightDelta = 0.0,
   }) {
     throw UnimplementedError();
   }
@@ -773,7 +773,7 @@ class _TextStyleProxy implements TextStyle {
     Color decorationColor,
     TextDecorationStyle decorationStyle,
     double decorationThickness,
-    String debugLabel
+    String debugLabel,
   }) {
     throw UnimplementedError();
   }
@@ -796,7 +796,7 @@ class _TextStyleProxy implements TextStyle {
     FontWeight fontWeight,
     FontStyle fontStyle,
     double height,
-    StrutStyle strutStyle
+    StrutStyle strutStyle,
   }) {
     throw UnimplementedError();
   }

packages/flutter/test/rendering/mock_canvas.dart

@@ -866,9 +866,15 @@ abstract class _PaintPredicate {
 
 abstract class _DrawCommandPaintPredicate extends _PaintPredicate {
   _DrawCommandPaintPredicate(
-    this.symbol, this.name, this.argumentCount, this.paintArgumentIndex,
+    this.symbol,
-    { this.color, this.strokeWidth, this.hasMaskFilter, this.style, }
+    this.name,
-  );
+    this.argumentCount,
+    this.paintArgumentIndex, {
+    this.color,
+    this.strokeWidth,
+    this.hasMaskFilter,
+    this.style,
+  });
 
   final Symbol symbol;
   final String name;
@@ -934,7 +940,9 @@ abstract class _DrawCommandPaintPredicate extends _PaintPredicate {
 }
 
 class _OneParameterPaintPredicate<T> extends _DrawCommandPaintPredicate {
-  _OneParameterPaintPredicate(Symbol symbol, String name, {
+  _OneParameterPaintPredicate(
+    Symbol symbol,
+    String name, {
     @required this.expected,
     @required Color color,
     @required double strokeWidth,
@@ -967,7 +975,9 @@ class _OneParameterPaintPredicate<T> extends _DrawCommandPaintPredicate {
 }
 
 class _TwoParameterPaintPredicate<T1, T2> extends _DrawCommandPaintPredicate {
-  _TwoParameterPaintPredicate(Symbol symbol, String name, {
+  _TwoParameterPaintPredicate(
+    Symbol symbol,
+    String name, {
     @required this.expected1,
     @required this.expected2,
     @required Color color,

packages/flutter/test/services/text_input_test.dart

@@ -26,7 +26,9 @@ void main() {
       );
       final Map<String, dynamic> json = configuration.toJson();
       expect(json['inputType'], <String, dynamic>{
-        'name': 'TextInputType.text', 'signed': null, 'decimal': null,
+        'name': 'TextInputType.text',
+        'signed': null,
+        'decimal': null,
       });
       expect(json['obscureText'], true);
       expect(json['autocorrect'], false);
@@ -42,7 +44,9 @@ void main() {
       );
       final Map<String, dynamic> json = configuration.toJson();
       expect(json['inputType'], <String, dynamic>{
-        'name': 'TextInputType.number', 'signed': false, 'decimal': true,
+        'name': 'TextInputType.number',
+        'signed': false,
+        'decimal': true,
       });
       expect(json['obscureText'], true);
       expect(json['autocorrect'], false);

packages/flutter/test/widgets/backdrop_filter_test.dart

@@ -37,8 +37,8 @@ void main() {
                 ),
               ),
             ],
-          )
+          ),
-        )
+        ),
       )
     );
     await expectLater(

packages/flutter/test/widgets/heroes_test.dart

@@ -1649,8 +1649,7 @@ void main() {
     expect(tester.takeException(), isAssertionError);
   });
 
-  testWidgets('Hero within a Hero subtree with Builder, throws', (
+  testWidgets('Hero within a Hero subtree with Builder, throws', (WidgetTester tester) async {
-      WidgetTester tester) async {
     await tester.pumpWidget(
       MaterialApp(
         home: Material(
@@ -1672,8 +1671,7 @@ void main() {
     expect(tester.takeException(),isAssertionError);
   });
 
-  testWidgets('Hero within a Hero subtree with LayoutBuilder, throws', (
+  testWidgets('Hero within a Hero subtree with LayoutBuilder, throws', (WidgetTester tester) async {
-      WidgetTester tester) async {
     await tester.pumpWidget(
       MaterialApp(
         home: Material(

packages/flutter/test/widgets/linked_scroll_view_test.dart

@@ -105,7 +105,8 @@ class LinkedScrollController extends ScrollController {
 }
 
 class LinkedScrollPosition extends ScrollPositionWithSingleContext {
-  LinkedScrollPosition(this.owner, {
+  LinkedScrollPosition(
+    this.owner, {
     ScrollPhysics physics,
     ScrollContext context,
     double initialPixels,

packages/flutter/test/widgets/semantics_tester.dart

@@ -621,8 +621,7 @@ class SemanticsTester {
 
 class _HasSemantics extends Matcher {
   const _HasSemantics(
-    this._semantics,
+    this._semantics, {
-    {
     @required this.ignoreRect,
     @required this.ignoreTransform,
     @required this.ignoreId,

packages/flutter/test/widgets/sliver_appbar_opacity.dart

@@ -166,7 +166,7 @@ void main() {
 
 class _TestWidget extends StatelessWidget {
 
-  const _TestWidget({this.pinned, this.floating, this.bottom, this.controller,});
+  const _TestWidget({this.pinned, this.floating, this.bottom, this.controller});
 
   final bool pinned;
   final bool floating;

packages/flutter_driver/test/src/timeline_summary_test.dart

@@ -21,15 +21,22 @@ void main() {
     }
 
     Map<String, dynamic> build(int timeStamp, int duration) => <String, dynamic>{
-      'name': 'Frame', 'ph': 'X', 'ts': timeStamp, 'dur': duration,
+      'name': 'Frame',
+      'ph': 'X',
+      'ts': timeStamp,
+      'dur': duration,
     };
 
     Map<String, dynamic> begin(int timeStamp) => <String, dynamic>{
-      'name': 'GPURasterizer::Draw', 'ph': 'B', 'ts': timeStamp,
+      'name': 'GPURasterizer::Draw',
+      'ph': 'B',
+      'ts': timeStamp,
     };
 
     Map<String, dynamic> end(int timeStamp) => <String, dynamic>{
-      'name': 'GPURasterizer::Draw', 'ph': 'E', 'ts': timeStamp,
+      'name': 'GPURasterizer::Draw',
+      'ph': 'E',
+      'ts': timeStamp,
     };
 
     List<Map<String, dynamic>> rasterizeTimeSequenceInMillis(List<int> sequence) {

packages/flutter_test/lib/src/binding.dart

@@ -231,7 +231,8 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
   /// [AutomatedTestWidgetsFlutterBinding] implementation to increase the
   /// current timeout. See [AutomatedTestWidgetsFlutterBinding.addTime] for
   /// details. The value is ignored by the [LiveTestWidgetsFlutterBinding].
-  Future<T> runAsync<T>(Future<T> callback(), {
+  Future<T> runAsync<T>(
+    Future<T> callback(), {
     Duration additionalTime = const Duration(milliseconds: 1000),
   });
 
@@ -740,7 +741,8 @@ class AutomatedTestWidgetsFlutterBinding extends TestWidgetsFlutterBinding {
   }
 
   @override
-  Future<T> runAsync<T>(Future<T> callback(), {
+  Future<T> runAsync<T>(
+    Future<T> callback(), {
     Duration additionalTime = const Duration(milliseconds: 1000),
   }) {
     assert(additionalTime != null);
@@ -1249,7 +1251,8 @@ class LiveTestWidgetsFlutterBinding extends TestWidgetsFlutterBinding {
   }
 
   @override
-  Future<T> runAsync<T>(Future<T> callback(), {
+  Future<T> runAsync<T>(
+    Future<T> callback(), {
     Duration additionalTime = const Duration(milliseconds: 1000),
   }) async {
     assert(() {

packages/flutter_test/lib/src/finders.dart

@@ -654,7 +654,9 @@ class _ElementPredicateFinder extends MatchFinder {
 }
 
 class _DescendantFinder extends Finder {
-  _DescendantFinder(this.ancestor, this.descendant, {
+  _DescendantFinder(
+    this.ancestor,
+    this.descendant, {
     this.matchRoot = false,
     bool skipOffstage = true,
   }) : super(skipOffstage: skipOffstage);

packages/flutter_test/lib/src/widget_tester.dart

@@ -409,7 +409,8 @@ class WidgetTester extends WidgetController implements HitTestDispatcher, Ticker
   /// are required to wait for the returned future to complete before calling
   /// this method again. Attempts to do otherwise will result in a
   /// [TestFailure] error being thrown.
-  Future<T> runAsync<T>(Future<T> callback(), {
+  Future<T> runAsync<T>(
+    Future<T> callback(), {
     Duration additionalTime = const Duration(milliseconds: 1000),
   }) => binding.runAsync<T>(callback, additionalTime: additionalTime);
 

packages/flutter_test/lib/src/window.dart

@@ -315,9 +315,11 @@ class TestWindow implements Window {
   }
 
   @override
-  void sendPlatformMessage(String name,
+  void sendPlatformMessage(
+    String name,
     ByteData data,
-                           PlatformMessageResponseCallback callback) {
+    PlatformMessageResponseCallback callback,
+  ) {
     _window.sendPlatformMessage(name, data, callback);
   }
 

packages/flutter_test/test/finders_test.dart

@@ -162,6 +162,5 @@ class SimpleCustomSemanticsRenderObject extends RenderBox {
   void describeSemanticsConfiguration(SemanticsConfiguration config) {
     super.describeSemanticsConfiguration(config);
     config..label = label..textDirection = TextDirection.ltr;
-
   }
 }

packages/flutter_tools/bin/fuchsia_attach.dart

@@ -113,7 +113,7 @@ Future<void> main(List<String> args) async {
         platformKernelDill: platformKernelDill,
         flutterPatchedSdk: flutterPatchedSdk,
       ),
-    }
+    },
   );
 }
 

packages/flutter_tools/lib/src/android/android_sdk.dart

@@ -588,7 +588,8 @@ class AndroidSdk {
 }
 
 class AndroidSdkVersion implements Comparable<AndroidSdkVersion> {
-  AndroidSdkVersion._(this.sdk, {
+  AndroidSdkVersion._(
+    this.sdk, {
     @required this.sdkLevel,
     @required this.platformName,
     @required this.buildToolsVersion,

packages/flutter_tools/lib/src/android/android_studio.dart

@@ -30,9 +30,13 @@ final RegExp _dotHomeStudioVersionMatcher =
 String get javaPath => androidStudio?.javaPath;
 
 class AndroidStudio implements Comparable<AndroidStudio> {
-  AndroidStudio(this.directory,
+  AndroidStudio(
-      {Version version, this.configured, this.studioAppName = 'AndroidStudio', this.presetPluginsPath})
+    this.directory, {
-      : version = version ?? Version.unknown {
+    Version version,
+    this.configured,
+    this.studioAppName = 'AndroidStudio',
+    this.presetPluginsPath,
+  }) : version = version ?? Version.unknown {
     _init();
   }
 

packages/flutter_tools/lib/src/build_info.dart

@@ -10,7 +10,9 @@ import 'globals.dart';
 
 /// Information about a build to be performed or used.
 class BuildInfo {
-  const BuildInfo(this.mode, this.flavor, {
+  const BuildInfo(
+    this.mode,
+    this.flavor, {
     this.trackWidgetCreation = false,
     this.compilationTraceFilePath,
     this.createBaseline = false,

packages/flutter_tools/lib/src/build_runner/build_runner.dart

@@ -119,7 +119,8 @@ class BuildRunner extends CodeGenerator {
   }
 
   @override
-  Future<CodegenDaemon> daemon(FlutterProject flutterProject, {
+  Future<CodegenDaemon> daemon(
+    FlutterProject flutterProject, {
     String mainPath,
     bool linkPlatformKernelIn = false,
     bool targetProductVm = false,

packages/flutter_tools/lib/src/commands/run.dart

@@ -34,7 +34,7 @@ abstract class RunCommandBase extends FlutterCommand {
       )
       ..addFlag('verbose-system-logs',
         negatable: false,
-        help: 'Include verbose logging from the flutter engine.'
+        help: 'Include verbose logging from the flutter engine.',
       )
       ..addOption('route',
         help: 'Which route to load when running the app.',

packages/flutter_tools/lib/src/commands/update_packages.dart

@@ -909,7 +909,10 @@ class PubspecHeader extends PubspecLine {
 
 /// A dependency, as represented by a line (or two) from a pubspec.yaml file.
 class PubspecDependency extends PubspecLine {
-  PubspecDependency(String line, this.name, this.suffix, {
+  PubspecDependency(
+    String line,
+    this.name,
+    this.suffix, {
     @required this.isTransitive,
     DependencyKind kind,
     this.version,

packages/flutter_tools/lib/src/compile.dart

@@ -412,7 +412,8 @@ class _RejectRequest extends _CompilationRequest {
 /// The wrapper is intended to stay resident in memory as user changes, reloads,
 /// restarts the Flutter app.
 class ResidentCompiler {
-  ResidentCompiler(this._sdkRoot, {
+  ResidentCompiler(
+    this._sdkRoot, {
     bool trackWidgetCreation = false,
     String packagesPath,
     List<String> fileSystemRoots,

packages/flutter_tools/lib/src/dart/pub.dart

@@ -76,7 +76,7 @@ Future<void> pubGet({
   bool upgrade = false,
   bool offline = false,
   bool checkLastModified = true,
-  bool skipPubspecYamlCheck = false
+  bool skipPubspecYamlCheck = false,
 }) async {
   directory ??= fs.currentDirectory.path;
 

packages/flutter_tools/lib/src/devfs.dart

@@ -337,8 +337,11 @@ class _DevFSHttpWriter {
 
 // Basic statistics for DevFS update operation.
 class UpdateFSReport {
-  UpdateFSReport({bool success = false,
+  UpdateFSReport({
-    int invalidatedSourcesCount = 0, int syncedBytes = 0}) {
+    bool success = false,
+    int invalidatedSourcesCount = 0,
+    int syncedBytes = 0,
+  }) {
     _success = success;
     _invalidatedSourcesCount = invalidatedSourcesCount;
     _syncedBytes = syncedBytes;

packages/flutter_tools/lib/src/device.dart

@@ -364,7 +364,8 @@ abstract class Device {
 }
 
 class DebuggingOptions {
-  DebuggingOptions.enabled(this.buildInfo, {
+  DebuggingOptions.enabled(
+    this.buildInfo, {
     this.startPaused = false,
     this.enableSoftwareRendering = false,
     this.skiaDeterministicRendering = false,

packages/flutter_tools/lib/src/fuchsia/fuchsia_device.dart

@@ -213,8 +213,7 @@ class FuchsiaDevice extends Device {
   _FuchsiaPortForwarder _portForwarder;
 
   @override
-  void clearLogs() {
+  void clearLogs() { }
-  }
 
   @override
   bool get supportsScreenshot => false;
@@ -306,7 +305,9 @@ class FuchsiaDevice extends Device {
 }
 
 class FuchsiaIsolateDiscoveryProtocol {
-  FuchsiaIsolateDiscoveryProtocol(this._device, this._isolateName, [
+  FuchsiaIsolateDiscoveryProtocol(
+    this._device,
+    this._isolateName, [
     this._vmServiceConnector = _kDefaultFuchsiaIsolateDiscoveryConnector,
     this._pollOnce = false,
   ]);

packages/flutter_tools/lib/src/ios/devices.dart

@@ -389,8 +389,7 @@ class IOSDevice extends Device {
   DevicePortForwarder get portForwarder => _portForwarder ??= _IOSDevicePortForwarder(this);
 
   @override
-  void clearLogs() {
+  void clearLogs() { }
-  }
 
   @override
   bool get supportsScreenshot => iMobileDevice.isInstalled;

packages/flutter_tools/lib/src/ios/mac.dart

@@ -625,15 +625,13 @@ Future<void> diagnoseXcodeBuildFailure(XcodeBuildResult result) async {
 }
 
 class XcodeBuildResult {
-  XcodeBuildResult(
+  XcodeBuildResult({
-    {
     @required this.success,
     this.output,
     this.stdout,
     this.stderr,
     this.xcodeBuildExecution,
-    }
+  });
-  );
 
   final bool success;
   final String output;
@@ -645,14 +643,12 @@ class XcodeBuildResult {
 
 /// Describes an invocation of a Xcode build command.
 class XcodeBuildExecution {
-  XcodeBuildExecution(
+  XcodeBuildExecution({
-    {
     @required this.buildCommands,
     @required this.appDirectory,
     @required this.buildForPhysicalDevice,
     @required this.buildSettings,
-    }
+  });
-  );
 
   /// The original list of Xcode build commands used to produce this build result.
   final List<String> buildCommands;

packages/flutter_tools/lib/src/resident_runner.dart

@@ -28,7 +28,8 @@ import 'run_hot.dart';
 import 'vmservice.dart';
 
 class FlutterDevice {
-  FlutterDevice(this.device, {
+  FlutterDevice(
+    this.device, {
     @required this.trackWidgetCreation,
     this.dillOutputPath,
     this.fileSystemRoots,
@@ -48,7 +49,8 @@ class FlutterDevice {
        );
 
   /// Create a [FlutterDevice] with optional code generation enabled.
-  static Future<FlutterDevice> create(Device device, {
+  static Future<FlutterDevice> create(
+    Device device, {
     @required bool trackWidgetCreation,
     String dillOutputPath,
     List<String> fileSystemRoots,
@@ -482,7 +484,8 @@ class FlutterDevice {
 
 // Shared code between different resident application runners.
 abstract class ResidentRunner {
-  ResidentRunner(this.flutterDevices, {
+  ResidentRunner(
+    this.flutterDevices, {
     this.target,
     this.debuggingOptions,
     this.usesTerminalUI = true,

packages/flutter_tools/lib/src/run_hot.dart

@@ -93,8 +93,11 @@ class HotRunner extends ResidentRunner {
     benchmarkData[name].add(value);
   }
 
-  Future<void> _reloadSourcesService(String isolateId,
+  Future<void> _reloadSourcesService(
-      { bool force = false, bool pause = false }) async {
+    String isolateId, {
+    bool force = false,
+    bool pause = false,
+  }) async {
     // TODO(cbernaschina): check that isolateId is the id of the UI isolate.
     final OperationResult result = await restart(pauseAfterRestart: pause);
     if (!result.isOk) {
@@ -589,7 +592,7 @@ class HotRunner extends ResidentRunner {
     }
   }
 
-  Future<OperationResult> _reloadSources({ bool pause = false, String reason, void Function(String message) onSlow, }) async {
+  Future<OperationResult> _reloadSources({ bool pause = false, String reason, void Function(String message) onSlow }) async {
     final Map<String, String> analyticsParameters = <String, String>{};
     if (reason != null) {
       analyticsParameters[kEventReloadReasonParameterName] = reason;

packages/flutter_tools/lib/src/vmservice.dart

@@ -424,8 +424,10 @@ abstract class ServiceObject {
   /// Factory constructor given a [ServiceObjectOwner] and a service map,
   /// upgrade the map into a proper [ServiceObject]. This function always
   /// returns a new instance and does not interact with caches.
-  factory ServiceObject._fromMap(ServiceObjectOwner owner,
+  factory ServiceObject._fromMap(
-                                 Map<String, dynamic> map) {
+    ServiceObjectOwner owner,
+    Map<String, dynamic> map,
+  ) {
     if (map == null)
       return null;
 

packages/flutter_tools/lib/src/vscode/vscode.dart

@@ -57,8 +57,11 @@ class VsCode {
     }
   }
 
-  factory VsCode.fromDirectory(String installPath, String extensionDirectory,
+  factory VsCode.fromDirectory(
-      { String edition }) {
+    String installPath,
+    String extensionDirectory, {
+    String edition,
+  }) {
     final String packageJsonPath =
         fs.path.join(installPath, 'resources', 'app', 'package.json');
     final String versionString = _getVersionFromPackageJson(packageJsonPath);

packages/flutter_tools/test/build_info_test.dart

@@ -9,12 +9,10 @@ import 'src/common.dart';
 import 'src/context.dart';
 
 void main() {
-  setUpAll(() {
+  setUpAll(() { });
-  });
 
   group('Validate build number', () {
-    setUp(() async {
+    setUp(() async { });
-    });
 
     testUsingContext('CFBundleVersion for iOS', () async {
       String buildName = validatedBuildNumberForPlatform(TargetPlatform.ios, 'xyz');
@@ -34,8 +32,7 @@ void main() {
   });
 
   group('Validate build name', () {
-    setUp(() async {
+    setUp(() async { });
-    });
 
     testUsingContext('CFBundleShortVersionString for iOS', () async {
       String buildName = validatedBuildNameForPlatform(TargetPlatform.ios, 'xyz');

packages/flutter_tools/test/commands/create_test.dart

@@ -900,7 +900,7 @@ void main() {
     final List<String> args = <String>[
       'create',
       '--list-samples',
-      outputFile
+      outputFile,
     ];
 
     await runner.run(args);
@@ -918,7 +918,7 @@ void main() {
     final List<String> args = <String>[
       'create',
       '--list-samples',
-      outputFile
+      outputFile,
     ];
 
     await expectLater(runner.run(args), throwsToolExit(exitCode: 2, message: 'Failed to write samples'));

packages/flutter_tools/test/commands/version_test.dart

@@ -108,12 +108,14 @@ class MockProcessManager extends Mock implements ProcessManager {
   }
 
   @override
-  Future<Process> start(List<dynamic> command,
+  Future<Process> start(
-      {String workingDirectory,
+    List<dynamic> command, {
+    String workingDirectory,
     Map<String, String> environment,
     bool includeParentEnvironment = true,
     bool runInShell = false,
-      ProcessStartMode mode = ProcessStartMode.normal}) {
+    ProcessStartMode mode = ProcessStartMode.normal,
+  }) {
     final Completer<Process> completer = Completer<Process>();
     completer.complete(MockProcess());
     return completer.future;

packages/flutter_tools/test/compile_test.dart

@@ -532,9 +532,12 @@ Future<void> _recompile(
   mockFrontendServerStdIn._stdInWrites.clear();
 }
 
-Future<void> _accept(StreamController<List<int>> streamController,
+Future<void> _accept(
-    ResidentCompiler generator, MockStdIn mockFrontendServerStdIn,
+  StreamController<List<int>> streamController,
-    String expected) async {
+  ResidentCompiler generator,
+  MockStdIn mockFrontendServerStdIn,
+  String expected,
+) async {
   // Put content into the output stream after generator.recompile gets
   // going few lines below, resets completer.
   generator.accept();
@@ -544,9 +547,13 @@ Future<void> _accept(StreamController<List<int>> streamController,
   mockFrontendServerStdIn._stdInWrites.clear();
 }
 
-Future<void> _reject(StreamController<List<int>> streamController,
+Future<void> _reject(
-    ResidentCompiler generator, MockStdIn mockFrontendServerStdIn,
+  StreamController<List<int>> streamController,
-    String mockCompilerOutput, String expected) async {
+  ResidentCompiler generator,
+  MockStdIn mockFrontendServerStdIn,
+  String mockCompilerOutput,
+  String expected,
+) async {
   // Put content into the output stream after generator.recompile gets
   // going few lines below, resets completer.
   scheduleMicrotask(() {

packages/flutter_tools/test/version_test.dart

@@ -403,11 +403,12 @@ void main() {
     expect(GitTagVersion.parse('v1.2.3-4-gx$hash').frameworkVersionFor(hash), '0.0.0-unknown');
     expect(testLogger.statusText, '');
     expect(testLogger.errorText, '');
-    expect(testLogger.traceText,
+    expect(
+      testLogger.traceText,
       'Could not interpret results of "git describe": x1.2.3-4-gabcdef\n'
       'Could not interpret results of "git describe": v1.0.0-unknown-0-gabcdef\n'
       'Could not interpret results of "git describe": beta-1-gabcdef\n'
-      'Could not interpret results of "git describe": v1.2.3-4-gxabcdef\n'
+      'Could not interpret results of "git describe": v1.2.3-4-gxabcdef\n',
     );
   });
 }