There is a color difference between the tree and the table empty-text.And I think use `$--color-text-secondary` is  more sense.

watch.value will keep firing during time picker selection
it now detects whether panel is closed before firing el.form.change

* date-picker: refactor type='dates'

fix issue #12323
{month, year} table highlights all selected dates
nuke selectedDates to provide cleaner data flow

* doc: correct date-picker's array usage

empty value must be falsy (empty array should not be used)

* Changelog: update for 2.4.6

* update changelog

* Pagination: make page-size attribute supports .sync

* Update pagination.js

* Tree: register node after dragging

* update Tree docs

* Input: not trigger validation when input

* InputNumber: update docs

* MessageBox: fix ElMessageBoxOptions.message

* Tree: fix type definition

* Input: fix wrong style of Input

* update input.vue

* add test case