get_left_gravity
Description:
Determines whether the mark has left gravity.
Parameters:
| this | 
           a `GtkTextMark`  | 
      
Returns:
| 
           true if the mark has left gravity, false otherwise  | 
      
Determines whether the mark has left gravity.
| this | 
           a `GtkTextMark`  | 
      
| 
           true if the mark has left gravity, false otherwise  |