Formatting can depend on cursor position

[DedSec256]

Original issue https://youtrack.jetbrains.com/issue/RIDER-102749

Reproduce via tests in the latest main branch:

[<Test>]
let ``cursor repro 1`` () =
    let result = formatWithCursor
                    """pipeline "init" {
    stage "restore-sln" {
        parallel
        run "dotnet tool restore"
    }
}
"""                 (4, 0)
    result |> assertCursor (4, 0) // Expected: (4,0) But was: (1,15)

[<Test>]
let ``cursor repro 2`` () =
    let result = formatWithCursor
                    """pipeline "init" {
    stage "restore-sln" {
        parallel
        run "dotnet tool restore"
    }
}
"""                 (3, 0)
    result |> assertCursor (3, 0) // Ok

[josh-degraw]

I guess I missed something in my testing, I swear I tried to write this exact test and it didn't fail for me haha, thanks for kicking this back over.

[nojaf]

The strange thing here is that the formatted code is different whether a cursor was inserted or not.

let formatWithCursor source (line, column) =
    let x  = CodeFormatter.FormatDocumentAsync(false, source, FormatConfig.Default) |> Async.RunSynchronously
    
    let y = CodeFormatter.FormatDocumentAsync(false, source, FormatConfig.Default, CodeFormatter.MakePosition(line, column))
    |> Async.RunSynchronously

    // Strangely they differ
    x.Code <> y.Code

[josh-degraw]

Yeah that's why I originally raised this issue, in my case it actually broke my code.

[nojaf]

Fix available in https://www.nuget.org/packages/fantomas/6.3.0-alpha-004