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[Bug Report] el-cascader Level 1 child ren is a space-time update problem #16348

@vxhly

Description

@vxhly

Element UI version

2.9.2

OS/Browsers version

Mac OS/Google Chrome 75

Vue version

2.6.10

Reproduction Link

https://codepen.io/vxhly/pen/MMVPgJ

Steps to reproduce

先选择其他的选项,当cascader有值之后,,,修改其值为 台湾省(该 children 为空),这时候,再次修改时展现的 children 没有更新为空选项 仍然为上一步操作的 children

What is Expected?

再次选择 children 为空的选项时,再次修改该 children 列表应该更新为空或者不显示,label较长时显示 tooltip

What is actually happening?

再次选择 children 为空的选项时,再次修改,该 children 列表显示成上一步骤展示的数据,,,,label较长时没有显示 tooltip

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