Started work on getting slicing to respect cancel
Started work on getting slicing to respect cancel

jlewin/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,mmoening/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,larsbrubaker/MatterControl,mmoening/MatterControl,mmoening/MatterControl,jlewin/MatterControl