[Feature] 希望增加一个多选任务拖动的功能

[thethreedays]

What problem does this feature solve?

现在想多选任务进行拖拽，或者是否有自定义事件可以自己去实现，没找到对应的任务拖拽事件

What does the proposed API look like?

类似DHTMLX Gantt通过 gantt.plugins({ multiselect: true }) 启用多选，并支持通过 Ctrl/Shift 键选择多个任务，然后批量拖动

[fangsmile]

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[hokkine]

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