Option for prompt "Snapshot has changed. Rewrite?"

[nofish]

When I practice my live set (organised in snapshots) with Usine I sometimes change things and then go to the next snapshot and forget to rewrite the old snapshot - changes lost.

So I thought maybe we could have a function with a popup saying "Snapshot has changed. Do you want to rewrite it?"
There should be an option to turn it on/off, because it's certainly not useful in all situations.

[senso]

I'll think about all of that.