message: Add check before scroll
  this line of code causes a scroll to top when we rerender a component (at that time window.pageYOffset might be 0)
diff: @@ -85,8 +85,10 @@ export default class Popup extends PureComponent<IPopupProps, IPopupState> {
  window.document.body.style.removeProperty("position");
  window.document.body.style.removeProperty("top");
  window.document.body.style.removeProperty("width");
  + if (this.state.scrollPosition) {
  window.scrollTo(0, this.state.scrollPosition);
  }
  + }
  public render() {
  if (typeof window === "undefined") {
  