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1. If you click out of a ComboBox (current value is not on the first page of the items) the new value in the ComboBox is empty. The internal value remains. 2. The same happens if you type in a 'new' value. Furthermore the new value only is applied to the ComboBox if you press enter, not if you click out of the ComboBox.
Use following code to reproduce:
finalComboBox<String> comboBox =newComboBox<>();
comboBox.setValue("k");// 'k' on 2. page of items
comboBox.setNewItemHandler(item -> comboBox.setValue(item));