src/Baum/Node.php
public function storeNewParent() {
    if ( $this->isDirty($this->getParentColumnName()) && ($this->exists || !$this->isRoot()) )
      static::$moveToNewParentId = $this->getParentId();
    else
      static::$moveToNewParentId = FALSE;
  }
public function storeNewParent() {
    if ( $this->isDirty($this->getParentColumnName()) && ($this->exists || !$this->isRoot()) )
      static::$moveToNewParentId = $this->getParentId();
    else
      static::$moveToNewParentId = FALSE;
  }
Store the parent_id if the attribute is modified so as we are able to move
the node to this new parent after saving.

@return void