Render a transparent ghost of the selection when things are selected.
Render a transparent ghost of the selection when things are selected.

Fixes Asana issue about layer view

fieldOfView/Cura,senttech/Cura,markwal/Cura,quillford/Cura,ad1217/Cura,fxtentacle/Cura,markwal/Cura,quillford/Cura,lo0ol/Ultimaker-Cura,ynotstartups/Wanhao,ad1217/Cura,DeskboxBrazil/Cura,ynotstartups/Wanhao,derekhe/Cura,derekhe/Cura,hmflash/Cura,bq/Ultimaker-Cura,fxtentacle/Cura,DeskboxBrazil/Cura,lo0ol/Ultimaker-Cura,fieldOfView/Cura,totalretribution/Cura,bq/Ultimaker-Cura,hmflash/Cura,senttech/Cura,totalretribution/Cura,Curahelper/Cura,Curahelper/Cura