Remove accentTextTheme from sliders and chips, tests and docs (#46801)

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

@@ -78,6 +78,8 @@ abstract class ChipAttributes {
 
   /// The style to be applied to the chip's label.
   ///
+  /// If null, the value of the [ChipTheme]'s [ChipThemeData.labelStyle] is used.
+  //
   /// This only has an effect on widgets that respect the [DefaultTextStyle],
   /// such as [Text].
   ///
@@ -2935,4 +2937,3 @@ bool _tapIsOnDeleteIcon({
   }
   return tapIsOnDeleteIcon;
 }
-

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

@@ -273,8 +273,9 @@ class RangeSlider extends StatefulWidget {
   /// There are two labels: one for the start thumb and one for the end thumb.
   ///
   /// Each label is rendered using the active [ThemeData]'s
-  /// [ThemeData.accentTextTheme.body2] text style, and can be overridden
-  /// by changing the [SliderThemeData.valueIndicatorTextStyle].
+  /// [ThemeData.textTheme.body2] text style, with the
+  /// theme data's [ThemeData.colorScheme.onPrimaryColor]. The label's text
+  /// style can be overridden with [SliderThemeData.valueIndicatorTextStyle].
   ///
   /// If null, then the value indicator will not be displayed.
   ///

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

@@ -302,7 +302,9 @@ class Slider extends StatefulWidget {
   /// as part of the value indicator shape.
   ///
   /// The label is rendered using the active [ThemeData]'s
-  /// [ThemeData.accentTextTheme.body2] text style.
+  /// [ThemeData.textTheme.body2] text style, with the
+  /// theme data's [ThemeData.colorScheme.onPrimaryColor]. The label's text style
+  /// can be overridden with [SliderThemeData.valueIndicatorTextStyle].
   ///
   /// If null, then the value indicator will not be displayed.
   ///

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

@@ -615,8 +615,6 @@ class SliderThemeData extends Diagnosticable {
   final ShowValueIndicator showValueIndicator;
 
   /// The text style for the text on the value indicator.
-  ///
-  /// By default this is the [ThemeData.accentTextTheme.body2] text theme.
   final TextStyle valueIndicatorTextStyle;
 
   /// Limits the thumb's separation distance.

packages/flutter/test/material/chip_theme_test.dart

@@ -169,7 +169,7 @@ void main() {
   testWidgets('ChipThemeData generates correct opacities for defaults', (WidgetTester tester) async {
     const Color customColor1 = Color(0xcafefeed);
     const Color customColor2 = Color(0xdeadbeef);
-    final TextStyle customStyle = ThemeData.fallback().accentTextTheme.body2.copyWith(color: customColor2);
+    final TextStyle customStyle = ThemeData.fallback().textTheme.body2.copyWith(color: customColor2);
 
     final ChipThemeData lightTheme = ChipThemeData.fromDefaults(
       secondaryColor: customColor1,
@@ -230,7 +230,7 @@ void main() {
     final ChipThemeData chipThemeBlack = ChipThemeData.fromDefaults(
       secondaryColor: Colors.black,
       brightness: Brightness.dark,
-      labelStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: Colors.black),
+      labelStyle: ThemeData.fallback().textTheme.body2.copyWith(color: Colors.black),
     ).copyWith(
       elevation: 1.0,
       pressElevation: 4.0,
@@ -241,7 +241,7 @@ void main() {
     final ChipThemeData chipThemeWhite = ChipThemeData.fromDefaults(
       secondaryColor: Colors.white,
       brightness: Brightness.light,
-      labelStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: Colors.white),
+      labelStyle: ThemeData.fallback().textTheme.body2.copyWith(color: Colors.white),
     ).copyWith(
       padding: const EdgeInsets.all(2.0),
       labelPadding: const EdgeInsets.only(top: 8.0, bottom: 8.0),

packages/flutter/test/material/slider_theme_test.dart

@@ -144,7 +144,7 @@ void main() {
       primaryColor: customColor1,
       primaryColorDark: customColor2,
       primaryColorLight: customColor3,
-      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: customColor4),
+      valueIndicatorTextStyle: ThemeData.fallback().textTheme.body2.copyWith(color: customColor4),
     );
 
     expect(sliderTheme.activeTrackColor, equals(customColor1.withAlpha(0xff)));
@@ -172,7 +172,7 @@ void main() {
       primaryColor: customColor1,
       primaryColorDark: customColor2,
       primaryColorLight: customColor3,
-      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: customColor4),
+      valueIndicatorTextStyle: ThemeData.fallback().textTheme.body2.copyWith(color: customColor4),
     );
 
     expect(sliderTheme.overlayShape, const RoundSliderOverlayShape());
@@ -191,13 +191,13 @@ void main() {
       primaryColor: Colors.black,
       primaryColorDark: Colors.black,
       primaryColorLight: Colors.black,
-      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: Colors.black),
+      valueIndicatorTextStyle: ThemeData.fallback().textTheme.body2.copyWith(color: Colors.black),
     ).copyWith(trackHeight: 2.0);
     final SliderThemeData sliderThemeWhite = SliderThemeData.fromPrimaryColors(
       primaryColor: Colors.white,
       primaryColorDark: Colors.white,
       primaryColorLight: Colors.white,
-      valueIndicatorTextStyle: ThemeData.fallback().accentTextTheme.body2.copyWith(color: Colors.white),
+      valueIndicatorTextStyle: ThemeData.fallback().textTheme.body2.copyWith(color: Colors.white),
     ).copyWith(trackHeight: 6.0);
     final SliderThemeData lerp = SliderThemeData.lerp(sliderThemeBlack, sliderThemeWhite, 0.5);
     const Color middleGrey = Color(0xff7f7f7f);