Steps to Reproduce

    <listbox viewModel="@id('vm')@init('org.zkoss.reference.component.data.MultipleSelectionVM')" 
             model="@load(vm.model)" rows="10" selectedItems="@bind(vm.selectedItems)">
        <listhead>
            <listheader label="listbox header"/>
        </listhead>
        <template name="model">
            <listitem label="${each}"/>
        </template>
    </listbox>

1. open chrome developer tool / enable device toolbar
2. select "iPad"
3. scroll down to select 30th item

Current Result

Listbox scrolls up to the first item

Expected Result

keep the current scroll position

debug info

• .z-focus-a doesn't move to the position of the selected listitem.
• _syncFocus() in listbox-touch.js doesn't move the focus element's position but _syncFocus() in SelectWidget.js moves the position.

workaround

attached js