Indentation issue on first item in generic bounds

[calebcartwright]

Reported in rust-lang/rust#80843 (comment)

Input

pub trait PrettyPrinter<'tcx>:
    Printer<
        'tcx,
        Error = fmt::Error,
        Path = Self,
        Region = Self,
        Type = Self,
        DynExistential = Self,
        Const = Self,
    > + fmt::Write
    {
         //
    }

Output

pub trait PrettyPrinter<'tcx>:
    Printer<
    'tcx,
    Error = fmt::Error,
    Path = Self,
    Region = Self,
    Type = Self,
    DynExistential = Self,
    Const = Self,
> + fmt::Write
{
    //
}

Expected output

pub trait PrettyPrinter<'tcx>:
    Printer<
        'tcx,
        Error = fmt::Error,
        Path = Self,
        Region = Self,
        Type = Self,
        DynExistential = Self,
        Const = Self,
    > + fmt::Write
{
    //
}

Meta

Bisected to 1.4.28 where a bug fix for handling comments between bounds was introduced (#4474)