row_inserted
Description:
This signal is emitted when a new row has been inserted in the model.
Note that the row may still be empty at this point, since it is a common pattern to first insert an empty row, and then fill it with the desired values.
Parameters:
| path | 
           a `GtkTreePath` identifying the new row  | 
      
| iter | 
           a valid `GtkTreeIter` pointing to the new row  |