detachRenderObject method
void
detachRenderObject()
Detaches the render objects at the top of this subtree from the ancestor render object. The default walks down through child elements; RenderObjectElement overrides it to detach its own render object and stop (the subtree below that render object travels with it).
Implementation
void detachRenderObject() {
visitChildren((c) => c.detachRenderObject());
}