.

wcfs/δbtail.go

@@ -740,6 +740,9 @@ func (δBtail *ΔBtail) rebuild() (err error) {
 	// merge trackNew into .trackIdx
 	// FIXME here trackNew was adjusted to correspond to @tail
 	// FIXME -> we have to map it back to correspond to @head before merge
+	//
+	// XXX -> teach diffT to return not only δtrack, but also δtrack*
+	// (conjugate) that would describe how track index changes if going A<-B ?
 	δBtail.trackIdx.Update(trackNew)
 
 	return nil