* Update DateTimePicker doc

* Update Tree doc

* Update DateTimePicker doc

* Update Tree doc

* update doc

* Update datetime-picker.md

* ColorPicker: support user input

* support alpha

* Update picker-dropdown.vue

* DateTimePicker: add timeformat for datetimerange

* fix

* DatePicker: fix picker interaction

* DatePicker: fix picker interaction

* fix

* DatePicker: fix picker interaction

* DatePicker: support keyboard control

* DatePicker: support keyboard control

* update test timeout

* fix space

add name prop

Revert "feature menu collapse"

This reverts commit e5ef11d87825f02357c434aedfcef79192600b1b.

* TimePicker: support keyboard control

* fix time-range

* fix timeformat

* add tabs position

* add tabs test

* Update tabs.md

* TimeSelect: support select with up&down

* using map & indexOf instead of findIndex

* fix select when time disabled

* fix ArrowUp

* TimeSelect: valid data when component blur or enter

* fix: #2514

Only emit change for user input

Before:
  select.value = 1;   // triggers change

After:
  select.value = 1;   // does not trigger change

When <el-form> missing `model`, validate will return false, then throw a warning to facilitate the developer troubleshooting