get_inverted
Description:
Returns whether the progress bar is inverted.
Parameters:
| this | 
           a `GtkProgressBar`  | 
      
Returns:
| 
           true if the progress bar is inverted  | 
      
Returns whether the progress bar is inverted.
| this | 
           a `GtkProgressBar`  | 
      
| 
           true if the progress bar is inverted  |