easyUI - dialog zindex bug

by sectioni

HTML

<link rel="stylesheet" href="https://www.jeasyui.com/easyui/themes/default/easyui.css">
<link rel="stylesheet" href="https://www.jeasyui.com/easyui/themes/icon.css">
<link rel="stylesheet" href="https://www.jeasyui.com/easyui/demo/demo.css">
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="https://www.jeasyui.com/easyui/jquery.easyui.min.js"></script>
<div id="dlg" class="easyui-dialog" title="Basic Dialog" data-options="iconCls:'icon-save'" style="width:400px;height:200px;padding:10px">
        The dialog content.
</div>

JavaScript

$('#dlg').dialog({title:"test", zIndex:50});