message: Fix the edit messager composer
  Broken in
  Fixes
diff: @@ -107,14 +107,15 @@ export default class EditMessageComposer extends React.Component {
  static contextType = MatrixClientContext;
  - constructor(props) {
  - super(props);
  + constructor(props, context) {
  + super(props, context);
  this.model = null;
  this._editorRef = null;
  this.state = {
  saveDisabled: true,
  };
  + this._createEditorModel();
  }
  _setEditorRef = ref => {
  @@ -223,10 +224,6 @@ export default class EditMessageComposer extends React.Component {
  this.props.editState.setEditorState(caret, parts);
  }
  - componentDidMount() {
  - this._createEditorModel();
  - }
  -
  _createEditorModel() {
  const {editState} = this.props;
  const room = this._getRoom();
  