message: Fix Hangul typing does not work properly
  compositionstart event may fire in the meantime because
  compositionend event is being processed asynchronously.
diff: @@ -203,9 +203,9 @@ export default class BasicMessageEditor extends React.Component {
  if (isSafari) {
  this._onInput({inputType: "insertCompositionText"});
  } else {
  - setTimeout(() => {
  + Promise.resolve().then(() => {
  this._onInput({inputType: "insertCompositionText"});
  - }, 0);
  + });
  }
  }
  