Steps to Reproduce

<combobox value="@bind(vm.someString)" selectedItem="@save(vm.someObject)" autodrop="true" model=".."/>

Enter text that matches exactly the label of an item. onChange fires multiple times,

1. vm.setSomeObject(..) gets called with correct value of (auto-selected) item
2. vm.setSomeString(..) gets called with correct text from textbox
3. vm.setSomeObject(..) gets called again with null value, which is wrong. Reason is that in org.zkoss.bind.converter.sys.ComboboxSelectedItemConverter:87, the selection is empty as it is not synced correctly/cleared again/whatever

Current Result

vm.setSomeObject(..) gets called with null value even though it was previously called with correct value

Expected Result

vm.setSomeObject(..) should be called only once with correct value as selected (implicitly) by entering the label text. Note: when clicking the comboitem, everything is fine

Debug Information

Workaround

Add onChange listener with prio=100 and set matching comboitem via code (and selection in model accordingly), very bad (yet working) solution.