One of the most popular features ever used on every computer is the Undo button. One of the most common questions every computer user has at any given moment i

One of the most popular features ever used on every computer is the Undo button. One of the most common questions every computer user has at any given moment is some variant of "What/Where was it?". I agree it's a holy grail, but it's also a road paved with good intentions.