2.6.0+ regression: constructor argument expression on a separate line gets folded back to the previous line if verticalMultiline.atDefnSite=true

[neko-kai]

• Configuration:

version = "2.6.1"
maxColumn = 170

continuationIndent.defnSite = 2
continuationIndent.extendSite = 2

verticalMultiline.atDefnSite = true
verticalMultiline.excludeDanglingParens = []

Steps

Given code like this:

final class Dummy[F[+_, +_]: BIOMonad: BIOPrimitives: Clock2](
  log: LogBIO[F]
) extends DIResource.LiftF(
    F.mkRef(Map.empty[Key, Item]).map(new Dummy.Impl(_))
  )

Scalafmt formats code like this:

final class Dummy[F[+_, +_]: BIOMonad: BIOPrimitives: Clock2](
  log: LogBIO[F]
) extends DIResource.LiftF(F.mkRef(Map.empty[Key, Item]).map(new Dummy.Impl(_)))

Expectation

I would like the formatted output to look like this, which is the formatting from version 2.5.2:

final class Dummy[F[+_, +_]: BIOMonad: BIOPrimitives: Clock2](
  log: LogBIO[F]
) extends DIResource.LiftF(
    F.mkRef(Map.empty[Key, Item]).map(new Dummy.Impl(_))
  )

Workaround

I've found that if the parameter log: LogBIO[F] in the example is moved up o the line with the rest of the declaration, then the argument expression is left unchanged and not folded:

final class Dummy[F[+_, +_]: BIOMonad: BIOPrimitives: Clock2](log: LogBIO[F])
  extends DIResource.LiftF(
    F.mkRef(Map.empty[Key, Item]).map(new Dummy.Impl(_))
  )