horizontalHeightMergePercent method
全部转换为高度的 百分比值
Implementation
PercentGetter horizontalHeightMergePercent(){
if(literal != null){
return (Size size){
return percentGetter(size) + pxUnitDoubleHeightPercentGetter(literal!.call(size))(size);
};
}else{
return percentGetter;
}
}