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ListBox does not select properly with repeated items

See original GitHub issue

Only one of the top three lines will be selected wherever you click

<ListBox >
    <ListBox.Items xmlns:sys="clr-namespace:System;assembly=mscorlib">
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
      <sys:String>Hello</sys:String>
      <sys:String>Cruel</sys:String>
      <sys:String>World</sys:String>
    </ListBox.Items>

   
    <ListBox.ItemsPanel>
      <ItemsPanelTemplate>
        <StackPanel Spacing="2" />
      </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate >
      <DataTemplate >
        <StackPanel Orientation="Horizontal">
          <StackPanel Orientation="Horizontal" Height="24">
            <TextBlock Width="80" Text="{Binding}"></TextBlock>
          </StackPanel>
        </StackPanel>
      </DataTemplate>
    </ListBox.ItemTemplate>
  </ListBox>