Additional sources root not working with PyCharm on Ubuntu

[jenswet]

Environment（环境）

name	version
IDEA version	PyCharm Professional 2020.1.1
EmmyLua version	1.3.3.150-IDEA201
OS	Ubuntu 18.04

What are the steps to reproduce this issue?（重现步骤？）

1. Create project.
2. Put library to any non project path
3. Add library as additional sources root

What happens?（出现什么问题？）

The sources root is not noticed by the IDE and just ignored.

What were you expecting to happen?（期望？）

The additional sources root is used by the IDE to provide autocompletion and syntax analysis for the references used from the external library.

Any logs, error output, etc?（有没有什么log, error输出？）

none

Any other comments?（其它说明）

See screenshot:

[adriweb]

This may be related to the things I describe in the first comment of #328

[jenswet]

@adriweb In PyCharm we can select additional sources roots. So that should not be the problem here.. But yes maybe it's still related.

[denisoster]

RubyMine 2.3 Not working External libraries

@tangzx