Rotation of an intersecting polyline

[osyka-yuri]

If you draw an hourglass-shaped element, the center of rotation is incorrectly defined.

[Falke-Design]

In the background we always convert the layer to a polygon and then using its center. Here is a Leaflet core problem with the polygon center calculation

https://plnkr.co/edit/N60dXAzFbVUdy86B