message: focus main composer after cancel or saving edit
diff: @@ -155,6 +155,7 @@ export default class MessageEditor extends React.Component {
  _cancelEdit = () => {
  dis.dispatch({action: "edit_event", event: null});
  + dis.dispatch({action: 'focus_composer'});
  }
  _sendEdit = () => {
  @@ -185,6 +186,7 @@ export default class MessageEditor extends React.Component {
  this.context.matrixClient.sendMessage(roomId, content);
  dis.dispatch({action: "edit_event", event: null});
  + dis.dispatch({action: 'focus_composer'});
  }
  _onAutoCompleteConfirm = (completion) => {
  