Undo button, for crashes

[Phlosioneer]

Currently, if your game crashes during a randomizer run and you last saved quite a while ago (more than 5 mins ago, for example), the tracker is left in limbo. You have to remember exactly what things you checked during that time, and you could miss something important. (Especially for 100% runs.)

I suggest an undo button. It would allow you to undo checks in the order you checked them, so now you only need to figure out (based on your saved location) where you left off. It's still not ideal but it's better than nothing, and at least gives some hints about what you're missing.

A redo button would also be nice, for similar reasons.