message: Only set title when it changes
  I've seen Chromium constantly refresh the title in the developer tools.
  To be honest, I'm not sure if this means Chromium wastes CPU
  time changing a title, but this may introduce better performance.
diff: @@ -1843,7 +1843,11 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  } else {
  subtitle = `${this.subTitleStatus} ${subtitle}`;
  }
  - document.title = `${SdkConfig.get().brand} ${subtitle}`;
  + const title = `${SdkConfig.get().brand} ${subtitle}`;
  +
  + if (document.title !== title) {
  + document.title = title;
  + }
  }
  updateStatusIndicator(state: string, prevState: string) {
  