borderGradient property
      
      LinearGradient?
      get
      borderGradient
      
    
    
    
Implementation
LinearGradient? get borderGradient => _borderGradient;
      
      set
      borderGradient
      (LinearGradient? value) 
      
    
    
    
Implementation
set borderGradient(LinearGradient? value) {
  if (_borderGradient != value) {
    _borderGradient = value;
    markNeedsLegendUpdate();
    markNeedsSegmentsPaint();
  }
}