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Use e.target instead :focus selector.
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@ -77,7 +77,7 @@
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if (!$items.length) return
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var index = $items.index($items.filter(':focus'))
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var index = $items.index(e.target)
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if (e.keyCode == 38 && index > 0) index-- // up
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if (e.keyCode == 40 && index < $items.length - 1) index++ // down
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