[Enhancement] [tree-select] tree-select expose popperRef attribute

[hellomrbigshot]

Feature type: Enhancement

Details

• Enhanced component name: tree-select

Description

I need to use popperRef attribute of el-tree-select.

I write a popover component which is like el-popover. Then I add a el-tree-select component in it. I use ClickOutside to get when the component is clicked. But I can't get the popperRef attrite of el-tree-select，so when I click the option outside the popper, the popper closed.
I also use el-select component in my popover, it exposes popperRef (called popperPaneRef before element-plus@2.5.0)，so it works for me.
My demo looks like below link shows. But I use el-popover to replace my own popover.

demo

popover + tree-select

Additional comments

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