Feature request: Respect `# fmt: skip` at the end of multi-line statements

[goodside]

Is your feature request related to a problem? Please describe.

Consider the following un-blackened code:

d = {}
d["foo"] = """
An example of very long text inserted into a dictionary.
"""

Applying black to this code produces an output that I'd argue is strictly worse than the input:

d = {}
d[
    "foo"
] = """
An example of very long text inserted into a dictionary.
""" 

It's unclear to me whether this constitutes a bug in black, but regardless I'd expect to be able to disable black on this one statement by writing # fmt: skip as follows:

d = {}
d["foo"] = """
An example of very long text inserted into a dictionary.
"""  # fmt: skip

This does not seem to work — the line is wrapped exactly as before.

Describe the solution you'd like

Python statements whose final line is marked with # fmt: skip should not be reformatted even if the statement spans across multiple lines.

Describe alternatives you've considered

My current workaround is to use # fmt: off and # fmt: on, but this is suboptimal as it adds exactly as many lines as it saves, except when there are multiple consecutive statements affected.

Additional context

I'm using conda-installed black 21.12b0 on MacOS Big Sur 11.6.

[ricardo-dematos]

This will be a hard one to accept and/or implement...

Looking to your example, it makes sense, but it somehow contradicts the idea that the line containing the directive # fmt: skip should be skipped, regardless of what it is. To allow the directive to be applied to a multi-line statement, means black must interpret what's formatting.

Though one this is... 🤔