- /* If this node is a fake page, it needs to be reinited
- * because its data has moved. But just reset mc_pg[0]
- * if the xcursor is already live.
+ /* If this node has dupdata, it may need to be reinited
+ * because its data has moved.
+ * If the xcursor was not initd it must be reinited.
+ * Else if node points to a subDB, nothing is needed.
+ * Else (xcursor was initd, not a subDB) needs mc_pg[0] reset.