Formatting Parameter Hints

[jfinity]

If my environment has formatting available for the language that I'm working in, it would be awesome if parameter hints (or really any other "generated" syntactic content for tooltips/popovers) was formatted for better readability -- probably according to whatever drives the formatOnSave feature. This would make it easier to parse/use unfamiliar APIs, especially when they have a lot of options. It could even be opt-in via a toggle in user settings (like formatOnSave is).

[maciejmatczak]

For such python example with docstrings (!):

def function1(arg1: int, arg2: str) -> str:
    """Very important function

    Args:
        arg1: description1
        arg2: description2

    Returns:
        Some string
    """
    pass

I am getting really nice hinting when I am typing the name of the function:

...but the first moment I type "(", it switches into SignatureHelp (command: "Trigger Parameter Hints"), which is not formatted:

TBH, I am not sure what triggers first view, but as both of those shares the same information value, I do prefer the one formatted.

[jrieken]

/duplicate #55044

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