Hey, completely forgot I’d suggested this. Having used Nolt for a while since, I’d say it doesn’t come up very often but when it does it’s annoying.
I’d suggest an ‘undo merge’ option for the first 5-30 seconds after you make your merge. That’s usually when you realise you’ve merged the wrong thing. You could delay the functional application of the merge until after that grace period to make it programatically easier to undo the user action.