message: focus editor after clicking edit
diff: @@ -144,6 +144,13 @@ export default class MessageEditor extends React.Component {
  componentDidMount() {
  this._updateEditorState();
  + const sel = document.getSelection();
  + const range = document.createRange();
  + range.selectNodeContents(this._editorRef);
  + range.collapse(false);
  + sel.removeAllRanges();
  + sel.addRange(range);
  + this._editorRef.focus();
  }
  render() {
  