Site-packages dependencies are not inspected

I would like to develop a library that has been installed into a local virtual environment with:

python setup.py develop

However, code inspections are not run on that package.
How do I activate code inspections for packages inside site-packages?

If you look at the two images, the code inspection box on the top right shows no errors even though I blatantly deleted all imports in the second image.
Is that a bug or a configuration issue?




Thank you and greetings
Moritz