[toast0]

I actually like those ~ files everywhere, because it makes for an easy and (almost) universal undo. But it does make a mess, and I understand why you might not want them. I would be surprised if you can't turn them off, though... and I'm even more surprised they came back after an update, I wonder if you set it in the system config and not a personal config, so it got overwritten when you updated; but possibly the config value changed names too. :(

That's very frustrating, and I hope nano treats you well.