Creates a row reference based on path. This reference will keep pointing
to the node pointed to by path, so long as it exists. It listens to all
signals emitted by model, and updates its path appropriately. If path
isn't a valid path in model, then NULL is returned.
Creates a row reference based on path. This reference will keep pointing to the node pointed to by path, so long as it exists. It listens to all signals emitted by model, and updates its path appropriately. If path isn't a valid path in model, then NULL is returned.