Constructing a slint struct in Python requires kwargs

[mitchgrout]

I may have missed this in the docs, but it appears that if you want to construct a struct exposed by slint in Python, you must use kwargs syntax. I was scratching my head over this for the last hour or so:

export struct Result {
  ok: bool,
  reason: string,
}

I had a pure callback validate(str: string) -> Result in a component, and noticed that everything worked fine if I implemented the callback in slint. However, in my Python code I had:

class App(...):
  @slint.callback
  def some_validator(self, text: str) -> Result:
    if bad:
      return Result(False, "something's wrong!")
    return Result(True)

After a bunch of debug() prints in slint, I noticed that it was always observing the result to be false. Assuming this was a bug, I wrote up a quick MVP in which I ended up using Result(ok=True) for clarity and... problem fixed.

I haven't really found much in the way of docs for the Python API, so I assume this is probably still a WIP. Is this behaviour intentional? If so, would it make sense to just raise an exception if we attempt to construct via positional arguments?

[tronical]

Thanks for the suggestion. Yeah, I think that makes sense.