When type search keyword in non-English, such as Chinese, choosing the word with up/down/enter key will fire selection event (movePointerDown) which cause trouble.

ex. Press down key to choose desired word, the selection pointer on options changed either, and when finish the word selection by press enter it will go to the current selected item directly, and the keyword I just entered was just gone!

I finally add extra "event" parameter to the three methods ( movePointerDown/ movePointerUp/ setOption) and add return when event.target.composing is true and got this issue solved.