message: Fix react error about functional components can't take props
diff: @@ -15,13 +15,13 @@ See the License for the specific language governing permissions and
  limitations under the License.
  */
  -import React from "react";
  +import React, {forwardRef} from "react";
  -export default ({mxEvent}) => {
  +export default forwardRef(({mxEvent}, ref) => {
  const text = mxEvent.getContent().body;
  return (
  - <span className="mx_UnknownBody">
  + <span className="mx_UnknownBody" ref={ref}>
  { text }
  </span>
  );
  -};
  +});
  