*<Null safety>*
void setChildProperties (double width, double height, double insetTop, double insetRight, double insetBottom, double insetLeft, {bool focusable: true})
void setChildProperties(double width, double height, double insetTop, double insetRight, double insetBottom, double insetLeft, {bool focusable = true}) { _sceneHost?.setProperties( width, height, insetTop, insetRight, insetBottom, insetLeft, focusable); }