docs: public final DoubleProperty rowSpacingProperty() {
          if (rowSpacing == null) {
              rowSpacing = new StyleableDoubleProperty(2) {
  
                  @Override
                  public CssMetaData<AllDayView, Number> getCssMetaData() {
                      return StyleableProperties.ROW_SPACING;
                  }
  
                  @Override
                  public Object getBean() {
                      return AllDayView.this;
                  }
  
                  @Override
                  public String getName() {
                      return "rowSpacing"; //$NON-NLS-1$
                  }
              };
          }
  
          return rowSpacing;
      }