Subtract X/Y distance from support roofs
Subtract X/Y distance from support roofs

Otherwise they may chip away pieces of the model.

Contributes to issue CURA-4523.

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