Improving support for Japanese input in Combobox

[tacomanator]

When inputting Japanese/Chinese, ideally onChange events, and especially the enter, up, and down keys, would be ignored when in a composing state, using the onCompositionEnd/onCompositionStart event handlers or the native event isComposing property. Otherwise, inputting Japanese becomes very problematic. Addressing onChange is possible with something like the following:

<Combobox.Input
  onChange={(event) =>
    !event.nativeEvent.isComposing
      ? doSomething(event.target.value)
      : null
  }
/>

Enter, up, and down are handled in the onKeyDown event handler, and I don't see how these could be addressed without modifying the handler to, for example, ignore key presses when in composition mode. for example:

let handleKeyDown = useEvent((event: ReactKeyboardEvent<HTMLInputElement>) => {
  if (ignoreKeyDownWhenComposing && event.nativeEvent.isComposing) return;
   ...
}

Is this something you would consider for headlessui?

PS. I believe this applies to Chinese input as well.