分屏的关闭事件，相关样式调整

shuishen

2021-06-04 a239631f7bbd0c17037c31d3fcb04504ab317c51

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<tr dojoAttachPoint="groupingNode" class="feedViewerGrouping">
    <td colspan="2" dojoAttachPoint="titleNode" class="feedViewerGroupingTitle">
    </td>
</tr>