FileSystemContainers need to .Load and fire .ContainerChanged on filter
FileSystemContainers need to .Load and fire .ContainerChanged on filter

- Issue MatterHackers/MCCentral#2455
Search not functioning in Downloads folder

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