Black: fmt: on/off ignores comments unless code also present

[djlondon]

fmt: off/on doesn't disable black formatting for comments unless code is also present.

The following:

# fmt: off
#setup: device 3423
# fmt: on

Yields:

# setup: device 3423

But, add some code:

# fmt: off
#setup: device 3423
black = 'test'
# fmt: on

and the comment is also ignored (as desired).

• Version: Lastest (19.10b0)
• OS and Python version: macOS 10.15.5/Python 3.8.2

Also happens on master.

[hugovk]

Duplicate of https://github.com/psf/black/issues/1245?

[ichard26]

Thanks @hugovk, yes, this is a duplicate of #1245. Thanks @djlondon for filing the bug report, good to know that this issue still exists on current master!