anchor.diff:    Widget build(BuildContext context) {
       final ThemeData theme = Theme.of(context);
       final FloatingActionButtonThemeData floatingActionButtonTheme = theme.floatingActionButtonTheme;
  -
  -    // Applications should no longer use accentIconTheme's color to configure
  -    // the foreground color of floating action buttons. For more information, see
  -    // https://flutter.dev/go/remove-fab-accent-theme-dependency.
  -    if (this.foregroundColor == null && floatingActionButtonTheme.foregroundColor == null) {
  -      final bool accentIsDark = theme.accentColorBrightness == Brightness.dark;
  -      final Color defaultAccentIconThemeColor = accentIsDark ? Colors.white : Colors.black;
  -      if (theme.accentIconTheme.color != defaultAccentIconThemeColor) {
  -        debugPrint(
  -          'Warning: '
  -          'The support for configuring the foreground color of '
  -          'FloatingActionButtons using ThemeData.accentIconTheme '
  -          'has been deprecated. Please use ThemeData.floatingActionButtonTheme '
  -          'instead. See '
  -          'https://flutter.dev/go/remove-fab-accent-theme-dependency. '
  -          'This feature was deprecated after v1.13.2.'
  -        );
  -      }
  -    }
   
       final Color foregroundColor = this.foregroundColor
         ?? floatingActionButtonTheme.foregroundColor
  
positive.code:   /// [ThemeData.floatingActionButtonTheme] is used. If that property is also
    /// null, then the [ColorScheme.onSecondary] color of [ThemeData.colorScheme]
    /// is used.
    ///
    /// Although the color of theme's `accentIconTheme` currently provides a
    /// default that supersedes the `onSecondary` color, this dependency
    /// has been deprecated:  https://flutter.dev/go/remove-fab-accent-theme-dependency.
    /// It will be removed in the future.
    final Color? foregroundColor;
  
    /// The button's background color.
  
negative.code: import 'package:flutter/widgets.dart';
  
  import 'button.dart';
  import 'floating_action_button_theme.dart';
  import 'scaffold.dart';
  import 'theme.dart';
  