Integrate private destinations for layered inputs

internal/engine/records.go

@@ -186,6 +186,7 @@ type SourceInfo struct {
 	ID            string
 	Label         string
 	Path          string
+	Destination   Path
 	Layer         Layer
 	Kind          SourceKind
 	UnderlayIndex int
@@ -260,6 +261,7 @@ func cloneLocations(locations []Location) []Location {
 
 func cloneSourceInfo(source SourceInfo) SourceInfo {
 	source.ImportedFrom = cloneLocation(source.ImportedFrom)
+	source.Destination = source.Destination.clone()
 	return source
 }