Great job! Any plans to make it work with Vaadin 18? Now it fails with runtime exception when using Vaadin 18.0.1:
Caused by: java.lang.NoSuchMethodError: 'void com.vaadin.flow.component.combobox.ComboBox.setItems(java.util.Collection)'
at software.xdev.vaadin.daterange_picker.ui.DateRangePickerOverlay.setItems(DateRangePickerOverlay.java:241)
at software.xdev.vaadin.daterange_picker.ui.DateRangePicker.<init>(DateRangePicker.java:114)
at software.xdev.vaadin.daterange_picker.ui.DateRangePicker.<init>(DateRangePicker.java:132)
at software.xdev.vaadin.daterange_picker.example.DateRangePickerStyledDemo.<init>(DateRangePickerStyledDemo.java:31)