Please stop Copilot from double-injecting code I've already written.

[JocelynSachs]

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Bug

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Every time I happen to need to wrap up existing code in an if() or other conditional, Copilot will helpfully suggest filling in the body of the if() statement with something approximating the code that's already there.

At best, this means I can't take the autocompletion of the if() and have to type it in manually, even if it's correct.

At worst (and this has happened a couple of times), I don't notice. This actually made it into released product at one point, with disastrous consequences.

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