[Bug Report] el-cascader repeats when it is folded.

[huangjinqiang]

Element UI version

2.4.6

OS/Browsers version

Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Vue version

2.5.17

Reproduction Link

http://output.jsbin.com/josuhisufo

Steps to reproduce

选中的时候，click后在收起前，在cascaderMenu上发生位移即可

What is Expected?

同时设置:check-on-select为true和expand-trigger为hover的时候， 希望在点选之后，不再因为默认的mouseenter去选中其他项

What is actually happening?

设置:check-on-select为true和expand-trigger为hover的时候， 在点选之后，如果在cascader收起的时候发生了位移，则会误选中其他

[element-bot]

Translation of this issue:

Element UI version
2.4.6

OS/Browsers version
Mozilla / 5.0 (Windows NT 6.1; Win64; x64) Apple WebKit / 537.36 (KHTML, like Gecko) Chrome / 68.0.3440.106 Safari / 537.36

Vue version
2.5.17

Reproduction Link
http://output.jsbin.com/josuhisufo]

Steps to reproduce
At the time of selection, click will shift on cascaderMenu before it is retracted.

What is Expected?
Simultaneously set: when check-on-select is true and expand-trigger is hover, you want to stop checking other items because of the default mouseenter after clicking

What is actually happening?
Settings: When check-on-select is true and expand-trigger is hover, after clicking, if a displacement occurs when the cascader is up, the other will be misselected