Display a message when processing the top layers takes a long time
Display a message when processing the top layers takes a long time

Contributes to CURA-957

senttech/Cura,totalretribution/Cura,ynotstartups/Wanhao,totalretribution/Cura,fieldOfView/Cura,ynotstartups/Wanhao,Curahelper/Cura,hmflash/Cura,hmflash/Cura,fieldOfView/Cura,senttech/Cura,Curahelper/Cura