Collapse change 事件传入参数有误

[StoneMoe]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.7.2

Environment

macos, chrome latest, vue 2.6.11

Reproduction link

Steps to reproduce

See minimal reproduction

What is expected?

The key parameter of @change event handler should be the value of which panel user just click, not the whole activeKey(v-model) array.
And the documentation say so.

What is actually happening?

key == activeKey

---

No way to know what panel user just click currently.

[StoneMoe]

除了无法得知用户正在点击的是哪个panel之外，也无法知道用户是正在展开还是正在收起panel，只能自己做workaround

[tangjinzhou]

v-model 本身会改变 activeKey，而且 activeKey 是个引用类型，为了 change 事件能够有机会控制最终activeKey的值，我们统一把change事件放置在 v-model 之后执行
你可以通过 watch：{ actvieKey (val, oldVal ){}} 来达到你的预期效果

[StoneMoe]

v-model 本身会改变 activeKey，而且 activeKey 是个引用类型，为了 change 事件能够有机会控制最终activeKey的值，我们统一把change事件放置在 v-model 之后执行
你可以通过 watch：{ actvieKey (val, oldVal ){}} 来达到你的预期效果

明白了，感谢答疑。
考虑到向前兼容，这一设计是否合理先按下不表
但这部分的文档我认为确实还有改进的空间

[github-actions]

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