False positive when checking for inconsistent setup script path on Windows

> python setup.py develop
running develop
Checking .pth file support in C:\project\venv\Lib\site-packages\
C:\project\venv\Scripts\pythonw.exe -E -c pass
TEST PASSED: C:\project\venv\Lib\site-packages\ appears to support .pth files
error: ("Can't get a consistent path to setup script from installation directory", 'c:\\project\\', 'c:\\project')

I am not sure what exactly is the cause (I did not have this problem previously, but suddenly sees it when coming back to work on an old project), but it seems to come from a quirk of realpath():

>>> import os
>>> os.path.realpath('.')
'C:\\Users\\uranusjr\\'
>>> os.path.realpath('../')
'C:\\Users\\'
>>> os.path.realpath('..')
'C:\\Users'

[uranusjr]

Of course!

> mkdir project
> cd project
> mkdir src
> [create setup.py]

from setuptools import find_packages, setup

setup(
    name='project',
    version='0.0.0',
    package_dir={'': 'src'},
    packages=find_packages('src'),
)

> python setup.py develop
running develop
Checking .pth file support in C:\Users\uranusjr\Documents\playground\project\.venv\Lib\site-packages\
C:\Users\uranusjr\Documents\playground\project\.venv\Scripts\pythonw.exe -E -c pass
TEST PASSED: C:\Users\uranusjr\Documents\playground\project\.venv\Lib\site-packages\ appears to support .pth files
error: ("Can't get a consistent path to setup script from installation directory", 'c:\\users\\uranusjr\\documents\\playground\\project\\', 'c:\\users\\uranusjr\\documents\\playground\\project')

[zmwangx]

Oh I missed the PR. Thanks for the pointer.