Show the next code on the same line when current code is about to expire

[vrubleg]

There is an option that always shows the next code, but it takes a whole line. I would suggest mix both "Indicate when codes are about to expire" and "Show next code" in a way that as soon as a code is about to expire, a new code fades in on the right of the current code. When current code is expired, the new code slides left on top of the old code.