Idempotency problem when calling multi-line discriminated union with generic type parameter

[Leaxe]

Issue created from fantomas-online

Formatted code

Animal<
    Identifier
 >

    .Dog(
        "Spot"
    )

Reformatted code

Animal<
    Identifier
 >


    .Dog(
        "Spot"
    )

Problem description

Fantomas was not able to produce the same code after reformatting the result.

I haven't totally figured out exactly what it is that makes it not idempotent, but it seems specific to an expression chain with a multi-line type expression and DotGet call. Problem does not appear with the following cases:

Animal<Identifier>()
    .Dog("Spot")

Animal<Identifier>.[0]
    .Dog("Spot")

PetAnimals
    .Dog("Spot")

Extra information

• The formatted result breaks my code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.
• I would like a release if this problem is solved.

Options

Fantomas main branch at 2024-09-14T12:20:28Z - 06d86ad

    { config with
                MaxLineLength = 10
                MaxDotGetExpressionWidth = 0 }

_{Did you know that you can ignore files when formatting by using a .fantomasignore file?
PS: It's unlikely that someone else will solve your specific issue, as it's something that you have a personal stake in.}