Binding.unbind
void unbind()Explicitly releases the binding between the source and the target property expressed by binding.
This function will release the reference that is being held on the binding instance if the binding is still bound; if you want to hold on to the #GBinding instance after calling [gobject.binding.Binding.unbind], you will need to hold a reference to it.
Note however that this function does not take ownership of binding, it only unrefs the reference that was initially created by [gobject.object.ObjectWrap.bindProperty] and is owned by the binding.