Source
T get height => _height;
Sets the height of the rectangle.
The height must be non-negative. If a negative height is supplied, it is clamped to zero.
Setting the value will change the bottom edge of the rectangle, but will not change top.
Source
void set height(T height) {
if (height < 0) height = _clampToZero/*<T>*/(height);
_height = height;
}