Yes, the problem is that fixing stuff can (and does) create regressions. So what REALLY HELPS is -- Fix ONE thing at a time. Usually, when I'm writing code or

Yes, the problem is that fixing stuff can (and does) create regressions. So what REALLY HELPS is -- Fix ONE thing at a time. Usually, when I'm writing code or fixing something, I put in a couple of unrelated improvements. There's a pretty good chance the unrelated improvements will break something. Breaking the unrelated improvements into their own separate self-contained step is usually all it takes.