OK, I gotta hand it to CoPilot.

[swelljoe@mas.to]

Undo/redo works, with infinite(ish) history. Now to refactor the multisprite bank thing to be more sensible (start with one sprite, and add an Add Sprite button, along with sprite operations like copy/paste), and maybe change the layout some, though I'm not sure how, yet. I guess Spritemate gets it pretty close to right.

[swelljoe@mas.to]

Now we're cooking. Redesigned the sprite bank to start with one sprite and allow adding an arbitrary number of additional sprites.

Next up...animation? I've been putting it off because it's scary. I guess I still need to fix save/load to deal with multiple sprites, also.