Using `get_active_node` might result in a locked `Node`; calling `add_view` on that `Node` throws an error. `get_active_node_default` always returns an unlocked `Node`.
Using `get_active_node` might result in a locked `Node`; calling `add_view` on that `Node` throws an error. `get_active_node_default` always returns an unlocked `Node`.