Pointless
The real problem here is that this question is pointless. It has no useful answer.
If the user trusts the code, it doesn't mean it is trustworthy. (Even well-intentioned code might have bugs.) It just means the user doesn't want to be pestered by an algorithm that is (inevitably) too dumb to answer the question by itself.
If the user doesn't trust the code, they presumably still want to read it, so they will click on the annoying popup to make it go away.
Either way, the user has been annoyed and Microsoft have learned nothing that they can act on. (I *assume* that MS don't do dangerous things on random pieces of code just because the end-user happens to be reading it. That would be like ActiveX on steroids.) On the other hand, the end-user has learned that they are using an IDE created by people who think this a security feature. Oh dear.
Biting the hand that feeds IT
