set_nat_lines
Description:
Sets the `nat-lines` of the inscription.
See the [property@Gtk.Inscription:nat-lines] property.
Parameters:
| this | a `GtkInscription` | 
| nat_lines | the number of lines that should ideally fit | 
Sets the `nat-lines` of the inscription.
See the [property@Gtk.Inscription:nat-lines] property.
| this | a `GtkInscription` | 
| nat_lines | the number of lines that should ideally fit |