Misalignment in Json stringify result with pretty when the object has a parent class with no variables

[MadEwink]

Haxe version : Tested on 4.3.2

Issue :
When using haxe.Json.stringify on a class which inherits a class with at least one method and no variables, pretty formatting will be broken with a missing line return and wrong indentation.
This is a minor issue that can safely be ignored.

Example :

class JsonPrettyClass {
    public static function main() {
        var p = new ParentClass();
        var c = new ChildClass();

        // If parent class had variables they would be last, thus causing no issue
        // trace("-- Parent class fields --");
        // for (f in Type.getInstanceFields(ParentClass)) {
        //     trace(f);
        // }

        // Child class field variables are before parent class methods
        // trace("-- Child class fields --");
        // for (f in Type.getInstanceFields(ChildClass)) {
        //     trace(f);
        // }

        var json = haxe.Json.stringify(c, "\t");
        trace(json);
    }
}

class ParentClass {
    // no field variable, the issue does not reproduce when there is one

    function anyFunc() {}

    public function new() {}
}

class ChildClass extends ParentClass {
    var anyVar : Int;
}

My understanding :
This is caused by the changes in this commit. In the specific case when the object which is passed to write happens to be an instance of a class which inherits a class with only methods and no variables, the if (i == last) condition in fieldsString is skipped.

Fix proposal :
fix-proposal.patch

[Simn]

Thanks! That's a nice edge case which apparently went unnoticed for 10 years. I've applied the fix as you've suggested, and added your example as a test. We will also add this to 4.3.