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Aug 19, 2017 at 15:25 comment added user I agree with HDE and Monica; question edits aren't supposed to invalidate answers, and such edits can generally be rolled back (or flagged if you don't have the rep to do that yourself). If it looks like the OP is genuinely wanting to ask something different, encourage them to post a new question, link to the existing question and specifically discuss the differences between the two. The latter is because otherwise, it'd be at high risk of being closed as a duplicate; discussing how they are different greatly reduces that risk (though it of course doesn't completely eliminate the risk).
Aug 16, 2017 at 21:28 comment added Monica Cellio Mod I agree with @HDE226868. If you see a question edit that invalidates good answers, please roll it back or raise it with the community. (I'm not concerned if an edit invalidates a snarky one-liner at -3; that wasn't going to survive anyway. I mean real answers.)
Aug 16, 2017 at 21:25 comment added Ray @HDE226868 Sure, but if just having a policy was sufficient, all answers to hard-science questions would be sufficiently rigorous and this issue wouldn't exist in the first place. In theory, this case should never happen, and even in practice, I don't expect it to happen often, but if the deletion policy were implemented, it'd be important to double check that the tag always existed before deleting information.
Aug 16, 2017 at 21:09 comment added HDE 226868 Mod I think our current policy in those cases is to just roll back the edit adding the tag. Question edits shouldn't invalidate answers (I'll try to get you an official source on that); adding the tag could very well do this. Therefore, I suppose the answer to this is that if things work properly, we don't let this situation arise. You're right; it would be unfair to the answerer.
Aug 16, 2017 at 21:06 history answered Ray CC BY-SA 3.0