addAll method
Implementation
void addAll(List<Component> components) {
children.addAll(components);
element.children.addAll(components.map((c) => c.element));
spacing = _spacing;
}
void addAll(List<Component> components) {
children.addAll(components);
element.children.addAll(components.map((c) => c.element));
spacing = _spacing;
}