When using --filename (streaming mode), --resolve-all-configs is not honoured.

[mjpieters]

When you use the --filename option while streaming Python code to stdin for formatting, isort ignores configuration in the path for that filename.

Given a directory foo with .isort.cfg in that directory, I would expect that cat <somefile> | isort --resolve-all-configs --filename 'foo/bar.py' would use foo/.isort.cfg. Is that an incorrect expectation?

If I instead first use cd foo and then pipe Python source code through isort, the .isort.cfg configuration is correctly picked up.

[mjpieters]

I just found #1989, this is a duplicate of that report.