2.4.8

• Switch 聚焦时不显示轮廓，#12771
• 修复 Dropdown 在 ButtonGroup 中样式问题，#12819 （by @bluejfox）
• Dialog 新增 opened 事件，#12828
• 修复 TabNav 显示顺序不正确的问题，#12846
• 修复 Tabs 没有滑动到选中 tab 的问题，#12948
• 修复 Tree 节点在拖拽时标识符不显示的问题，#12854
• Form 的 validate 事件参数中包含了校验的信息，#12860 （by @YamenSharaf）
• 修复 DatePicker 没有校验用户输入时间的合法性问题，#12898
• 修复 Table 表头的 render-header属性不生效的问题，#12914

• Not displaying outline when Switch is focused, #12771
• Fixed Dropdown's style in ButtonGroup, #12819 (by @bluejfox)
• Added opened event for Dialog, #12828
• Fixed the incorrect display order of TabNav, #12846
• Fixed the problem that Tabs did not scroll to the selected tab, #12948
• Fixed the problem that the identifier does not display when the Tree node is dragged, #12854
• The validate event parameter of Form contains the validation message, #12860 (by @YamenSharaf)
• Fixed DatePicker not to verify the validity of user input time, #12898
• Fixed the problem that render-header attribute of Table header doesn't work, #12914