Show keystrokes on completion

This has been on my wishlist for a while. Of course the user feedback is good (say you're not sure what you typed wrong during your entry), but this also makes it easier to copy/paste solutions to the comments or other sites.

This is possibly annoying in rare cases where you've typed thousands of strokes in a session, and it has to write them all to the terminal. That can happen in sessions you never intended to submit, say you were running a bunch of experiments before resetting to make your real submission. Not sure that's worth dealing with though.