line_mark_activated
Description:
public virtual signal void line_mark_activated (TextIter iter, uint button, ModifierType state, int n_presses)
  
  Emitted when a line mark has been activated (for instance when there was a button press in the line marks gutter).
You can use iter to determine on which line the activation took place.
Parameters:
| iter | 
           a TextIter  | 
      
| button | 
           the button that was pressed  | 
      
| state | 
           the modifier state, if any  | 
      
| n_presses | 
           the number of presses  |