Inserts an action in this’s action item list at position index_ with text text
.
If you want the action item to have markup, use insert_action_markup.
Note that index_ is a relative position in the list of actions and the position of an action can change when deleting a
different action.
| this | |
| index_ |
the index of the item to insert |
| text |
text of the item to insert |