selected_foreach
Description:
Calls a function for each selected node.
Note: 
      
        
    
    Use GtkListView or GtkColumnView
Note that you cannot modify the tree or selection from within this function. As a result, get_selected_rows might be more useful.
Parameters:
| this | A `GtkTreeSelection`. | 
| func | The function to call for each selected node. | 
| data | user data to pass to the function. |