if (action == Action::toggleGrabs && _current != _head) {
// the toggleGrabs key can only be set up as a root key, since if
// it was a chain key, we'd have to not ungrab the whole chain up
if (action == Action::toggleGrabs && _current != _head) {
// the toggleGrabs key can only be set up as a root key, since if
// it was a chain key, we'd have to not ungrab the whole chain up