message: need to check isComposing on native event
diff: @@ -194,7 +194,7 @@ export default class BasicMessageEditor extends React.Component {
  // checking the event.isComposing flag just in case any browser out there
  // emits events related to the composition after compositionend
  // has been fired
  - return !!(this._isIMEComposing || event.isComposing);
  + return !!(this._isIMEComposing || (event.nativeEvent && event.nativeEvent.isComposing));
  }
  _onPaste = (event) => {
  