formatOnType add unwanted space to *args in multiline list

[MisLink]

Environment data

• VS Code version: 1.24.1
• Extension version (available under the Extensions sidebar): 2018.6.0
• OS and version: macos 10.13.5
• Python version (& distribution if applicable, e.g. Anaconda): CPython 3.6.5
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: formater: black 18.6b4

Actual behavior

command = [
    "ffmpeg",
    *params,  # enter
    * params,  # add a space
    "-filter_complex",
    "amerge",
    "-ac",
    "2",
    "-c:a",
    "libmp3lame",
    "-q:a",
    "4",
    dest,
]

my config：

    "python.autoComplete.showAdvancedMembers": true,
    "python.formatting.provider": "black",
    "python.jediEnabled": true,
    "python.jediMemoryLimit": -1,
    "python.linting.pylintEnabled": false,
    "python.linting.flake8Enabled": true,
    "python.autoComplete.addBrackets": true,
    "python.sortImports.args": [
        "-ns",
        "__init__.py"
    ],

Expected behavior

command = [
    "ffmpeg",
    *params,  # enter; keep it as it is
    "-filter_complex",
    "amerge",
    "-ac",
    "2",
    "-c:a",
    "libmp3lame",
    "-q:a",
    "4",
    dest,
]

Steps to reproduce:

1. paste code and try it.

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

None

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help)

None

[d3r3kk]

Hi @MisLink! Please update the issue with the contents of the original template so we can help sort this out for you. With the information above I cannot reproduce the issue on the latest versions of the editor, the extension, and Python (3.6) with Black as the formatter.

What Python interpreter are you using? Is this a virtual environment?
What version of VSCode/the Python extension are you working on?
Which formatter do you have enabled? (autopep8, black, etc...)

Please add step-by-step instructions on how to reproduce as well. These details (at minimum) are required for us to discover the problem.

[MisLink]

@d3r3kk Sorry... I mistakenly believe that reproducing is easy.

[d3r3kk]

Thanks for the details, I appreciate the time you took to add all of that.
I cannot reproduce on Linux 18.04 using the same setup as you have here, as soon as we get a chance we will try and reproduce on a Mac.

[MikhailArkhipov]

I'll have a look.