Revert "[Slider] Rebase. (#52663)" (#53698)

This reverts commit e71cf1cd.

dev/integration_tests/flutter_gallery/lib/demo/material/slider_demo.dart

@@ -69,7 +69,6 @@ class _CustomRangeThumbShape extends RangeSliderThumbShape {
     @required SliderThemeData sliderTheme,
     TextDirection textDirection,
     Thumb thumb,
-    bool isPressed,
   }) {
     final Canvas canvas = context.canvas;
     final ColorTween colorTween = ColorTween(
@@ -131,8 +130,6 @@ class _CustomThumbShape extends SliderComponentShape {
     SliderThemeData sliderTheme,
     TextDirection textDirection,
     double value,
-    double textScaleFactor,
-    Size sizeWithOverflow,
   }) {
     final Canvas canvas = context.canvas;
     final ColorTween colorTween = ColorTween(
@@ -172,8 +169,6 @@ class _CustomValueIndicatorShape extends SliderComponentShape {
     SliderThemeData sliderTheme,
     TextDirection textDirection,
     double value,
-    double textScaleFactor,
-    Size sizeWithOverflow,
   }) {
     final Canvas canvas = context.canvas;
     final ColorTween enableColor = ColorTween(
@@ -273,12 +268,7 @@ class _SlidersState extends State<_Sliders> {
                   ),
                 ),
               ),
-              SliderTheme(
-                data: const SliderThemeData(
-                  showValueIndicator: ShowValueIndicator.always,
-                ),
-                child: Slider.adaptive(
-                  label: _continuousValue.toStringAsFixed(6).toString(),
+              Slider.adaptive(
                 value: _continuousValue,
                 min: 0.0,
                 max: 100.0,
@@ -288,7 +278,6 @@ class _SlidersState extends State<_Sliders> {
                   });
                 },
               ),
-              ),
               const Text('Continuous with Editable Numerical Value'),
             ],
           ),

dev/integration_tests/flutter_gallery/lib/gallery/themes.dart

@@ -21,12 +21,10 @@ ThemeData _buildDarkTheme() {
   final ColorScheme colorScheme = const ColorScheme.dark().copyWith(
     primary: primaryColor,
     secondary: secondaryColor,
-    onPrimary: secondaryColor,
   );
   final ThemeData base = ThemeData(
     brightness: Brightness.dark,
     accentColorBrightness: Brightness.dark,
-    colorScheme: colorScheme,
     primaryColor: primaryColor,
     primaryColorDark: const Color(0xFF0050a0),
     primaryColorLight: secondaryColor,

packages/flutter/test/painting/system_fonts_test.dart

@@ -169,10 +169,7 @@ void main() {
         (ByteData data) { },
     );
     final RenderObject renderObject = tester.renderObject(find.byType(RangeSlider));
-
-    bool sliderBoxNeedsLayout;
-    renderObject.visitChildren((RenderObject child) {sliderBoxNeedsLayout = child.debugNeedsLayout;});
-    expect(sliderBoxNeedsLayout, isTrue);
+    expect(renderObject.debugNeedsLayout, isTrue);
   });
 
   testWidgets('Slider relayout upon system fonts changes', (WidgetTester tester) async {
@@ -195,10 +192,7 @@ void main() {
         (ByteData data) { },
     );
     final RenderObject renderObject = tester.renderObject(find.byType(Slider));
-
-     bool sliderBoxNeedsLayout;
-     renderObject.visitChildren((RenderObject child) {sliderBoxNeedsLayout = child.debugNeedsLayout;});
-     expect(sliderBoxNeedsLayout, isTrue);
+    expect(renderObject.debugNeedsLayout, isTrue);
   });
 
   testWidgets('TimePicker relayout upon system fonts changes', (WidgetTester tester) async {