Implementation
set apply(NikuWrap? v) {
if (v == null) return;
this.direction = v.direction ?? direction;
this.alignment = v.alignment ?? alignment;
this.spacing = v.spacing ?? spacing;
this.runAlignment = v.runAlignment ?? runAlignment;
this.runSpacing = v.runSpacing ?? runSpacing;
this.crossAxisAlignment = v.crossAxisAlignment ?? crossAxisAlignment;
this.textDirection = v.textDirection ?? textDirection;
this.verticalDirection = v.verticalDirection ?? verticalDirection;
this.clipBehavior = v.clipBehavior ?? clipBehavior;
$parent..$merge(v.$parent);
}