--line-ranges dedents a # fmt: off in the middle of a decorator

[yilei]

Describe the bug

Given the following code:

@decor(
    a = 1,
    # fmt: off
    b = (2, 3),
    # fmt: on
)
def func():
    pass

Run black with

$ black --line-ranges=8-8 file.py

Line 8 is pass, and the file will be formatted to:

@decor(
    a = 1,
# fmt: off
    b = (2, 3),
    # fmt: on
)
def func():
    pass

Expected behavior

No formatting changes.

Environment

• Black's version: [main]

Additional context

I'll take a look at this, I think we need to save additional info when code is converted to STANDALONE_COMMENT for # fmt: off/skip markers before we convert lines outside of --line-ranges= to STANDALONE_COMMENT.