Hey Hamsta, ready for a quick brain‑bender duel? I've got a puzzle that could use a competitive touch—let's see who can solve it fastest!

Here’s a quick one for you: I’m a word that’s always on the move, but I never leave my spot. I keep your code tidy, but you can’t read me if you hide my shape. I’m short when you’re busy, long when you’re relaxed. What am I? Happy hunting!