Bug fixes

• Table
  • Fix sort icon (#15439 by @bezany)
  • Fix layout breaks when append slot exists (#16332 by @ziyoung)
  • Fix showOverflowTooltip not reactive (#16295 by @a631807682)
  • Register scrollbar in filter-panel (#16246 by @ziyoung)
• Chore
  • Fix 2.9 docs (#16233 by @ziyoung)
  • Fix index page theme intro english css style issue (#16254 by @iamkun)

Optimization

• Tag
  • Compatible with IE (#16334 by @ziyoung)
• Chore
  • Update Dingtalk Group QR image (#16236 by @iamkun)
• Doc
  • Update online theme roller doc (#16244 by @iamkun)

Bug 修复

• Table
  • 排序 icon 问题修复 (#15439 by @bezany)
  • 修复 append slot 存在时布局错位问题 (#16332 by @ziyoung)
  • 修复 showOverflowTooltip 更新无效的问题 (#16295 by @a631807682)
  • 修复 FilterPanel 中 Scrollbar 未注册问题 (#16246 by @ziyoung)
• Chore
  • 更新版本号，修复文档问题 (#16233 by @ziyoung)
  • 修复英文首页样式问题 (#16254 by @iamkun)

优化

• Tag
  • 兼容 IE (#16334 by @ziyoung)
• Chore
  • 更新钉钉3群二维码 (#16236 by @iamkun)
• Doc
  • 更新主题编辑器文档 (#16244 by @iamkun)