message: don't close autocomplete when hitting tab
  that's not what the slate impl does and it's not an improvement
diff: @@ -52,9 +52,6 @@ export default class AutocompleteWrapperModel {
  } else {
  await acComponent.moveSelection(e.shiftKey ? -1 : +1);
  }
  - this._updateCallback({
  - close: true,
  - });
  }
  onUpArrow() {
  