Loïc Bartoletti

@sloriot Can you take a look at this issue since the error is reported by CGAL? Do you want me to open a ticket upstream?

```select ST_StraightSkeleton ('POLYGON ((4.6496243000000002 43.5206941000000000, 4.6525242999999996 43.5138711000000029, 4.6538323000000004 43.5135961000000009, 4.6575601000000004 43.5140630000000002, 4.6610893000000004 43.5289111000000020, 4.6611813000000000 43.5289641000000032, 4.6613262999999998 43.5290541000000033, 4.6616742999999996 43.5292700999999980, 4.6662613000000004 43.5319630999999987, 4.6694462999999997 43.5364300999999969, 4.6773002999999997 43.5426701000000023, 4.6773223000000002 43.5500510999999975, 4.6770063000000004 43.5516341000000011, 4.6727913000000001...

@m-kuhn @ponceta my PR to expose actions to QgisInterface: https://github.com/qgis/QGIS/pull/33628

@m-kuhn it will simplify my previous code. With QGIS 3.12 the action will be like the addPart action something like: ``` ws_lyr = QgsProject.instance().mapLayer('od_wastewater_structure') feature = next( ws_lyr.getFeatures( QgsFeatureRequest().setFilterExpression( 'obj_id...