Remove "unnecessary" imports. (#74899)

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 

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

@@ -5,7 +5,6 @@
 import 'dart:math' as math;
 import 'dart:ui' as ui;
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
 import 'colors.dart';

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

@@ -5,7 +5,6 @@
 import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/painting.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'ink_well.dart' show InteractiveInkFeature;

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

@@ -4,7 +4,6 @@
 
 import 'dart:math' as math;
 
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'ink_well.dart';

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

@@ -4,7 +4,6 @@
 
 import 'dart:math' as math;
 
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'ink_well.dart';

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 
 import 'date.dart';

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

@@ -5,7 +5,6 @@
 import 'dart:math' as math;
 
 import 'package:flutter/widgets.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
 
 import 'colors.dart';

packages/flutter/lib/src/material/material_state.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' show Color;
-
 import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
 

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

@@ -6,15 +6,12 @@ import 'dart:ui';
 
 import 'package:flutter/widgets.dart';
 
-import '../../scheduler.dart';
-
 import 'color_scheme.dart';
 import 'ink_well.dart';
 import 'material.dart';
 import 'material_localizations.dart';
 import 'navigation_rail_theme.dart';
 import 'theme.dart';
-import 'theme_data.dart';
 
 /// A material widget that is meant to be displayed at the left or right of an
 /// app to navigate between a small number of views, typically between three and

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

@@ -10,7 +10,6 @@ import 'package:flutter/widgets.dart';
 
 import 'navigation_rail.dart';
 import 'theme.dart';
-import 'theme_data.dart';
 
 /// Defines default property values for descendant [NavigationRail]
 /// widgets.

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

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/cupertino.dart';
-import 'package:flutter/widgets.dart';
 
 import 'page_transitions_theme.dart';
 import 'theme.dart';

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

@@ -4,7 +4,6 @@
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/widgets.dart';
 
 import 'colors.dart';
 import 'theme.dart';

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

@@ -5,7 +5,6 @@
 import 'dart:math' as math;
 
 import 'package:flutter/widgets.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/gestures.dart' show DragStartBehavior;
 
 import 'button_bar.dart';

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

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/widgets.dart';
 
 import 'material.dart';
 import 'theme.dart';

packages/flutter/lib/src/material/radio.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 'package:flutter/foundation.dart';
-import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 

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

@@ -8,7 +8,6 @@ import 'dart:math' as math;
 import 'dart:ui' show lerpDouble;
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter/gestures.dart' show DragStartBehavior;
 
@@ -27,7 +26,6 @@ import 'material.dart';
 import 'snack_bar.dart';
 import 'snack_bar_theme.dart';
 import 'theme.dart';
-import 'theme_data.dart';
 
 // Examples can assume:
 // late TabController tabController;

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

@@ -4,7 +4,6 @@
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/gestures.dart';
-import 'package:flutter/widgets.dart';
 
 import 'color_scheme.dart';
 import 'material_state.dart';

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
 import 'app_bar.dart';

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

@@ -4,8 +4,6 @@
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/rendering.dart';
-import 'package:flutter/services.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 

packages/flutter/lib/src/material/shadows.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' show Color, Offset;
-
 import 'package:flutter/painting.dart';
 
 // Based on https://material.io/design/environment/elevation.html

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

@@ -11,7 +11,6 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart' show timeDilation;
 import 'package:flutter/services.dart';
-import 'package:flutter/widgets.dart';
 
 import 'constants.dart';
 import 'debug.dart';

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

@@ -11,7 +11,6 @@ import 'package:flutter/widgets.dart';
 
 import 'colors.dart';
 import 'theme.dart';
-import 'theme_data.dart';
 
 /// Applies a slider theme to descendant [Slider] widgets.
 ///

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

@@ -14,7 +14,6 @@ import 'snack_bar_theme.dart';
 import 'text_button.dart';
 import 'text_button_theme.dart';
 import 'theme.dart';
-import 'theme_data.dart';
 
 const double _singleLineVerticalPadding = 14.0;
 

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

@@ -6,7 +6,6 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
-import 'package:flutter/widgets.dart';
 
 import 'colors.dart';
 import 'constants.dart';