ref: 10bd3aeb2ac89a22d5ecfec5942db43e684912ec
parent: 51b496e1183baceeaee8679e922a290dc51f8207
author: Ben Harris <bjh21@bjh21.me.uk>
date: Fri Nov 18 09:40:56 EST 2022
pearl: Return NULL when Backspace or Escape does nothing When there's no drag in progress, cancelling the drag has no effect. Returning NULL lets the front-end know this, which in particular means the Backspace key can leave the app in KaiOS.