Add "type" of action when using undo/redo

[marciogurka]

Forum post

"Hello, we are using Gantt and we enabled STM, and we are listening:
restoringstop event to intercept restore events
recordingstop event to handle if the user can undo/redo

Nevertheless, we have two different issues here:

[...]

Also, is there a way to know if I'm "undoing" or "redoing", besides doing the calculation with the position and the queue length?
"

We could have a type or something like that when the restoringstop is being called with the type of action if the user is undoing or redoing something.