anchor.diff:    /// If this parameter is null, then the value of the Theme's indicatorColor
     /// property is used.
     ///
  -  /// If [indicator] is specified, this property is ignored.
  +  /// If [indicator] is specified or provided from [TabBarTheme],
  +  /// this property is ignored.
     final Color indicatorColor;
   
     /// The thickness of the line that appears below the selected tab.
  
positive.code:   ///
    /// The default value of [indicatorPadding] is [EdgeInsets.zero].
    ///
    /// If [indicator] is specified, this property is ignored.
    final EdgeInsetsGeometry indicatorPadding;
  
    /// Defines the appearance of the selected tab indicator.
    ///
    /// If [indicator] is specified, the [indicatorColor], [indicatorWeight],
    /// and [indicatorPadding] properties are ignored.
    ///
    /// The default, underline-style, selected tab indicator can be defined with
    /// [UnderlineTabIndicator].
  
negative.code:   /// The value of this parameter must be greater than zero and its default
    /// value is 2.0.
    ///
    /// If [indicator] is specified or provided from [TabBarTheme],
    /// this property is ignored.
    final double indicatorWeight;
  
    /// The horizontal padding for the line that appears below the selected tab.
  