get_paper_height
Description:
Returns the paper height in units of unit.
Note that this function takes orientation, but not margins into consideration. See [method@Gtk.PageSetup.get_page_height].
Parameters:
| this | 
           a `GtkPageSetup`  | 
      
| unit | 
           the unit for the return value  | 
      
Returns:
| 
           the paper height.  |