The first change of Tabs child control props cannot be monitored by watch

[holyrong]

Discussed in #4432

^{Originally posted by holyrong July 27, 2021}
ant-design-vue 2.2.2

父组件：

子组件：

运行效果：

为什么在第一次切换tab到user时，staff-user子组件的watch监听不到变化？如果子组件不放到tabs中，可以正常监听props的变化。

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[zkwolf]

试试watch加immediate参数

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