Retain matched resolution evidence in history

internal/engine/resolution_correspondence.go

@@ -16,6 +16,17 @@ type resolutionCorrespondence struct {
 	collections map[string]collectionCorrespondence
 }
 
+func (c resolutionCorrespondence) clone() resolutionCorrespondence {
+	result := resolutionCorrespondence{collections: make(map[string]collectionCorrespondence, len(c.collections))}
+	for key, collection := range c.collections {
+		collection.path = collection.path.clone()
+		collection.entryToFinal = append([]int(nil), collection.entryToFinal...)
+		collection.finalToEntry = append([]int(nil), collection.finalToEntry...)
+		result.collections[key] = collection
+	}
+	return result
+}
+
 func buildResolutionCorrespondence(entry, final *document.Node, policy sequencePolicy) resolutionCorrespondence {
 	result := resolutionCorrespondence{collections: make(map[string]collectionCorrespondence)}
 	var indexes mappingIndex