Group of actions that should un-done or re-done in a single step
Inherits from list, so can be treates as a list of actions. See UndoStackManager for more details on undo actions.
| Method | __init__ | 
    Undocumented | 
| Method | reversed | 
    Returns a new UndoActionGroup with the reverse actions of this group. | 
| Class Variable | __slots__ | 
    Undocumented | 
| Instance Variable | can_merge | 
    True when this group can be merged with another group | 
| Instance Variable | cursor | 
    the position to restore the cursor afre un-/re-doning |