A variant of set_valist which takes the columns and values as two arrays, instead of varargs.
This function is mainly intended for language bindings or in case the number of columns to change is not known until run-time.
| this |
A `GtkTreeStore` |
| iter |
A valid `GtkTreeIter` for the row being modified |
| columns |
an array of column numbers |
| values |
an array of GValues |
| n_values |
the length of the |