Polygon Drawing not working in swimlanes (…)
If you look at the definition of PolygonDrawingTool, https://gojs.net/latest/extensions/PolygonDrawingTool.js, you will see that canStart explicitly checks whether the mouse-down event is on an existing Part. You might want to either make that check smarter or remove it, depending on what you want your users to be able to do.
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