lost focus if enable overflow-y: scroll on div that contains item list

[FabioConte]

To solve this issue is necessary add Prevent blur on text field before click. To do this you can modify class SuggestionList, add this method

private void onMouseDown(Event event) {
    // Prevent blur on text field before click on scroll
    event.preventDefault();
}

add this attribute

private EventListener onMouseDown = this::onMouseDown;

And add to method create wrapper this two line

    EventTarget divTarge = div.cast();
    divTarge.addEventListener(BrowserEvents.MOUSEDOWN, onMouseDown);

I hope this help someone