coordinates of polygon are not computed properly when polygon goes outside map
Here is example query that was performed on export of the polygon (using openlayers implementation)
0:0:0:0:0:0:0:1 - - [10/Oct/2018:10:21:33 +0200] "GET /minerva//api//projects/sample2/models/6:downloadModel?backgroundOverlayId=10&handlerClass=lcsb.mapviewer.converter.model.celldesigner.CellDesignerXmlParser&polygonString=6.37,5.42;600.25,9.88;606.62,252.02;542.90,385.19;269.54,376.91;5219.36,218.24;0.00,181.92;6.37,5.42;&zoomLevel=4& HTTP/1.1" 200 52127