Start polyline from correct side if we chanced on first line
Start polyline from correct side if we chanced on first line

If we didn't traverse at all because we lucked out, we didn't go in the correct direction.

Contributes to issue CURA-4017.

ROBO3D/CuraEngine,ROBO3D/CuraEngine,Ultimaker/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine