tree data UPDATE correctly unlink list keys

List keys were not correctly unlinked leading to wrong hashes.

Author: Humblesaw

src/tree_data.c

@@ -1206,6 +1206,19 @@ lyd_unlink_ignore_lyds(struct lyd_node **first_sibling_p, struct lyd_node *node)
         /* check for NP container whether its last non-default node is not being unlinked */
         lyd_np_cont_dflt_set(lyd_parent(node));
 
+        /* when unlinking duplicate key we need to recalculate the list hash */
+        if (node->schema && (node->schema->flags & LYS_KEY) && node->parent->schema &&
+                lyd_insert_has_keys(lyd_parent(node))) {
+            /* unlink the list instance */
+            lyd_unlink_hash(lyd_parent(node));
+
+            /* calculate updated instance hash */
+            lyd_hash(lyd_parent(node));
+
+            /* reinsert list into its parent HT */
+            lyd_insert_hash(lyd_parent(node));
+        }
+
         node->parent = NULL;
     }