message: force model update after composition finishes
diff: @@ -152,6 +152,9 @@ export default class BasicMessageEditor extends React.Component {
  _onCompositionEnd = (event) => {
  this._isIMEComposing = false;
  + // some browsers (chromium) don't fire an input event after ending a composition
  + // so trigger a model update after the composition is done by calling the input handler
  + this._onInput({inputType: "insertCompositionText"});
  }
  _onInput = (event) => {
  