anchor.diff:  
   extension DevToolsColorScheme on ColorScheme {
     bool get isLight => brightness == Brightness.light;
  +
     bool get isDark => brightness == Brightness.dark;
   
     // Commonly used themed colors.
  
positive.code: 
    Color get expandedTopContentColor =>
        isLight ? Colors.grey[50] : Colors.grey[850];
    Color get expandedBottomContentColor =>
        isLight ? Colors.grey[200] : Colors.grey[800];
  
  
negative.code:     // Same values for both light and dark themes.
      primaryColorDark: devtoolsBlue[700],
      primaryColorLight: devtoolsBlue[400],
      // ignore: deprecated_member_use
      accentColor: devtoolsBlue[400],
      backgroundColor: devtoolsGrey[600],
      toggleableActiveColor: devtoolsBlue[400],
  