Delete word in search

Is this a bug?
#1

Hi.
I’ve a select multiple with many options and some options selected.

<select name="names[]" multiple="">
    <option value="4">AAAAAA</option>
    <option value="3">BBBBB</option>
    <option value="5">CCCCC</option>
    <option value="64" selected="">DDDDD</option>
    <option value="6">EEEEE</option>
    <option value="8" selected="">FFFFF</option>
    <option value="2">GGGGG</option>
    ....
    <option value="1">ZZZZZ</option>
</select>

If I click on “search element” and I press backspace, the last option selected is removed from the list and the search value become the text of the “search element”.
In this example, search is empty, I press backspace and “search element” value become “FFFFF”.
It is possible to disable this behavior?
Or there is way to manage the “change search” event?

#2

Too many limits with this component.
Switchet to virtual-select