> GetLastError() docs officially scare us

I believe this is a case where the docs were updated from intended/correct behavior to actual behavior, which happens from time to time and is never clearly marked.

As I say, they are _supposed_ to leave the error unchanged unless they return a value that indicates an error occurred, but some APIs behave incorrectly. The docs are simply documenting that fact. (It turns out reality is more useful than fantasy ;) though I do wish they were clearer about that)