And you can Undo several steps back !
eg when you right click , it will show you the last action eg Undo Move...
After doing that , if u right Click , it will show you the action prior eg Undo Add..
After doing that , if u right Click , it will show you the action prior eg Undo Delete ....
And before you ask (cause I tried

), you cant as yet do a Redo / Cntrl Y.