VisActor
vtable树形表格及甘特图，是否可以添加快捷方法，用于缩进一级或者升一级？
缩进一级和升一级，连同子级一同升降，具体可参照dhtmlx-gantt的实现：https://docs.dhtmlx.com/gantt/samples/?sample=%2702_extensions/09_multiselection.html%27&filter=%27indent%27
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