[libxml2] Make xmlStaticCopyNode non-recursive

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 7618a3b15947cd28a060bde24992f8a96256d7d4
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sun Feb 6 21:11:38 2022 +0100

    Make xmlStaticCopyNode non-recursive

 tree.c | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)
---
diff --git a/tree.c b/tree.c
index e4425f10..8077348a 100644
--- a/tree.c
+++ b/tree.c
@@ -4342,8 +4342,45 @@ xmlStaticCopyNode(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent,
        }
        ret->last = ret->children;
     } else if ((node->children != NULL) && (extended != 2)) {
-        ret->children = xmlStaticCopyNodeList(node->children, doc, ret);
-       UPDATE_LAST_CHILD_AND_PARENT(ret)
+        xmlNodePtr cur, insert;
+
+        cur = node->children;
+        insert = ret;
+        while (cur != NULL) {
+            xmlNodePtr copy = xmlStaticCopyNode(cur, doc, insert, 2);
+            if (copy == NULL) {
+                xmlFreeNode(ret);
+                return(NULL);
+            }
+
+            if (insert->last == NULL) {
+                insert->children = copy;
+            } else {
+                copy->prev = insert->last;
+                insert->last->next = copy;
+            }
+            insert->last = copy;
+
+            if (cur->children != NULL) {
+                cur = cur->children;
+                insert = copy;
+                continue;
+            }
+
+            while (1) {
+                if (cur->next != NULL) {
+                    cur = cur->next;
+                    break;
+                }
+
+                cur = cur->parent;
+                insert = insert->parent;
+                if (cur == node) {
+                    cur = NULL;
+                    break;
+                }
+            }
+        }
     }
 
 out: