anchor.diff:    final theme = ThemeData.dark();
     final background = isValidDarkColor(ideTheme?.backgroundColor)
         ? ideTheme?.backgroundColor
  -      : null;
  +      : theme.canvasColor;
   
     return theme.copyWith(
       primaryColor: devtoolsGrey[900],
  
positive.code:     selectedRowColor: devtoolsBlue[600],
      buttonTheme: theme.buttonTheme.copyWith(minWidth: buttonMinWidth),
      scaffoldBackgroundColor: background,
    );
  }
  
  
negative.code:     selectedRowColor: devtoolsGrey[600],
      buttonTheme: theme.buttonTheme.copyWith(minWidth: buttonMinWidth),
      scaffoldBackgroundColor: background,
      colorScheme: theme.colorScheme.copyWith(background: background),
    );
  }
  
  