Mark this PipelineOwner as detached.
Typically, this is only called directly on the root PipelineOwner. Children are automatically detached from their parent's PipelineManifold when dropChild is called.
Implementation
void detach() {
assert(_manifold != null);
_manifold!.removeListener(_updateSemanticsOwner);
_manifold = null;
// Not updating the semantics owner here to not disrupt any of its clients
// in case we get re-attached. If necessary, semantics owner will be updated
// in "attach", or disposed in "dispose", if not reattached.
for (final PipelineOwner child in _children) {
child.detach();
}
}