Suggestion box flips from "drop down" to "drop up" if there are a few items on the next page.

[pinneri]

vaadin-combobox-multiselect: 2.6
vaadin: 8.5

        ComboBoxMultiselect<String> f = new ComboBoxMultiselect<>("", v);
        f.setPlaceholder("<any>");
        f.showClearButton(true);
        f.showSelectAllButton(true);

There's seem to be strange behaviour of the suggestions (aka dropdown) when going to the next page and this depends on the number of items on the next page too.

For instance, we have the page length for suggestions set to 10. If we have between 11-15 items then the next page (via mouse wheel or clicking on the scroll down arrow) of the suggestion goes from a "drop down" to a "drop up". If it's greater than 15 then the suggestion box behaviour is consistent (always drop down).

Hence when selecting the combobox we expect the suggestions to go down from the field, but it seems the suggestion list can flip to up if you scroll to the next page that is partially filled (less than half of a full page we found).

Note the drop down or drop up behaviour depends on where the widget is situated in the frame. Close to the bottom you get a "drop up" suggestions box if there isn't enough room. The problem we're facing is a drop down going to a drop up on the next page even when the "up" suggestions page has less items than the previous one.

Appreciate the component too!