get_use_size
Description:
Returns whether the selected font size is used in the label.
Parameters:
| this | a `GtkFontDialogButton` | 
Returns:
| whether the selected font size is used in the label | 
Returns whether the selected font size is used in the label.
| this | a `GtkFontDialogButton` | 
| whether the selected font size is used in the label |