PyCQA / PyCQA/flake8-bugbear

`extend-ignore` and `extend-select` options seem to be ignored

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bug help wanted
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Description

If I use --extend-ignore or --extend-select options, B950 is not taken into account.

OK:

▹ flake8 --select=E,B950  longline.py
longline.py:1:80: E501 line too long (109 > 79 characters)
longline.py:1:110: B950 line too long (109 > 79 characters)

▹ flake8 --select=E,B950 --ignore=E501 longline.py
longline.py:1:110: B950 line too long (109 > 79 characters)

Not OK:

▹ flake8 --extend-select=E,B950 longline.py
longline.py:1:80: E501 line too long (109 > 79 characters)

▹ flake8 --extend-select=E,B950 --ignore=E501 longline.py

▸ flake8 --select=E,B950 --extend-ignore=E501 longline.py

Versions:

▸ flake8 --version
4.0.1 (flake8-bugbear: 22.1.11, mccabe: 0.6.1, pycodestyle: 2.8.0,
pyflakes: 2.4.0) CPython 3.10.1 on Linux

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the reported flake8 commands with the listed flake8-bugbear and dependency versions, comparing --select/--ignore with --extend-select/--extend-ignore. Trace how these options reach the B950 check; the issue is done when the extend variants consistently include or suppress B950 as shown by the expected command output.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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