Bug 477021

SUMMARY

When analyzing a python code with flake8 in the integrated plugin, I cannot pass any extra argument to flake8.
Usually this is done through a setup.cfg file. However, even when adding such a file to the project, there is no change.

STEPS TO REPRODUCE
1.  Install flake8
2.  Open a simple .py file, with at least one line longer than 79 columns.
3.  Create a setup.cfg file with following content :
``` 
[flake8]
max-line-length = 99
```
4. Analyze the code with flake8 in the integrated plugin.

OBSERVED RESULT

Flake8 is still displaying errors for lines longer than 79 instead of 99.

EXPECTED RESULT

Flake8 should use any existing setup.cfg file and read the arguments. Otherwise there should be an option to pass extra arguments to flake8 in Kate config panel.

SOFTWARE/OS VERSIONS
Linux : Mint 21.2
KDE Plasma Version: 5.24.7 
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

* I guess this should be set in this file : https://invent.kde.org/utilities/kate/-/blob/master/addons/project/tools/flake8.cpp
* See here for the config files of flake8 : https://flake8.pycqa.org/en/latest/user/configuration.html