How to get IME composing state❓

[rk54rk]

I'm writing a binding to bind the QuillController with a Yrs doucment for collaborative editing, by listening to the QuillController.changes stream:

  void _subscribeToQuillController() {
    _quillEditorSubscription?.cancel();

    _quillEditorSubscription = quillController.changes.listen((DocChange change) {
      if (change.source != ChangeSource.local) {
        return;
      }

      // Filter out intermediate changes from IMEs (e.g., Chinese, Japanese).
      if (quillController.plainTextEditingValue.composing.isValid) {
        Log.localVerbose('QuillYjsBinding: Ignoring intermediate IME change.');
        return;
      }

      _localChangeQueue.add(change);

      if (_isApplyingLocalChange) {
        return;
      }

      _processQueuedLocalChanges();
    });
  }

Ideally, we would want to filter out all DocChanges that is from an intermitiate IME composing, because these should never appear in the collaborative document, plus they could potentially create lots of unecessary updates.

Now, I try to do this with quillController.plainTextEditingValue.composing.isValid, but when typing with an IME this value has always been false, and the filter never worked.

I wonder what is the correct way to get IME state when editing?

[rk54rk]

Making some progress - for anyone interested in the issue, I'm now using a custom (extending) QuillRawEditor, overriding its updateEditingValue() method to access TextEditingValue.composing.isValid (which is the IME composing status), and then added a stream to expose custom DocChange events containing these information.