When you click on the arrow button of an empty combo box in Vaadin 12.0.0, the popup opens with a “busy” indicator until you click off the combo.
While minor, this does make it look like the search function is unresponsive.
ComboBox<Integer> combo = new ComboBox<>();
combo.setDataProvider((filter, offset, limit) -> Stream.empty(), s -> 0);
combo.setAllowCustomValue(false);
add(combo);
This works fine (popup does not open) if you press Enter, but clicking the button looks like the attached.
Is this how the combo box is intended to work?
