It is possible to drag a node out of the visible area/canvas in a Sankey diagram
Version
4.8.0
Reproduction link
https://echarts.apache.org/examples/en/editor.html?c=sankey-energy
Steps to reproduce
Drag any node and drop it out of the canvas area. The node is not accessible afterwards anymore.

What is expected?
The node cannot be dragged out of the visible area/canvas.
What is actually happening?
The node can be dragged out of the visible area/canvas
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Still relevant.
Yes this is still relevant!