This seems like a really cool idea that would help with a scenario I encounter a lot with conflicts related to auto-formatting. Sometimes a small change can lead to a lot of whitespace changes below (in functional chains in js, for example).

Can this also detect some scenarios where semantic conflicts (but not line conflicts) arise, usually due to moved code?

I don't know the exact circumstances when this happens, but occasionally you can have e.g a function defined twice after two branches both move the same function elsewhere.