[issue9949] os.path.realpath on Windows does not follow symbolic links

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Okay, the venv break is related (and it should have broken more frequently).

The new realpath() implementation leaves the \\?\ prefix behind if the path doesn't exist, since that's the error you get when the path is longer than MAX_PATH and you're on a system that can't handle it.

I think the best fix is probably to strip the prefix if the file didn't exist at the start and still doesn't exist afterwards.

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