message: [bugfix] Tab: sticky in scroll element
diff: @@ -107,7 +107,7 @@ export default create({
  // scroll to correct position
  if (this.position === 'page-top' || this.position === 'content-bottom') {
  - scrollUtils.setScrollTop(this.scrollEl, scrollUtils.getElementTop(this.$el));
  + scrollUtils.setScrollTop(window, scrollUtils.getElementTop(this.$el));
  }
  },
  @@ -196,7 +196,7 @@ export default create({
  // adjust tab position
  onScroll() {
  - const scrollTop = scrollUtils.getScrollTop(this.scrollEl);
  + const scrollTop = scrollUtils.getScrollTop(window);
  const elTopToPageTop = scrollUtils.getElementTop(this.$el);
  const elBottomToPageTop = elTopToPageTop + this.$el.offsetHeight - this.$refs.wrap.offsetHeight;
  if (scrollTop > elBottomToPageTop) {
  