[gxml] BackedNode: replace copy node logic with new internal gxml_document_copy_node

[Richard Hans Schwarting <rschwart src gnome org>]

commit 1ad2d5a606688f701df6fdfa0c2a9d01e8a385c1
Author: Richard Schwarting <aquarichy gmail com>
Date:   Tue Aug 6 16:03:23 2013 +0200

    BackedNode: replace copy node logic with new internal gxml_document_copy_node

 gxml/BackedNode.vala |    4 +---
 gxml/Document.vala   |    6 ++++++
 2 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/gxml/BackedNode.vala b/gxml/BackedNode.vala
index 20dc844..4a54bf1 100644
--- a/gxml/BackedNode.vala
+++ b/gxml/BackedNode.vala
@@ -275,9 +275,7 @@ namespace GXml {
                                   mess up the other document.  (TODO: consider removing it from
                                   the originating document.)  The node's references should be
                                   updated to this one. */
-                               new_child.owner_document.sync_dirty_elements ();
-                               Xml.Node *node_copy = ((BackedNode)new_child).node->doc_copy 
(this.owner_document.xmldoc, 1);
-                               return this.child_nodes.append_child (this.owner_document.lookup_node 
(node_copy));
+                               return this.child_nodes.append_child (this.owner_document.copy_node 
(new_child));
                        } else {
                                return this.child_nodes.append_child (new_child);
                        }
diff --git a/gxml/Document.vala b/gxml/Document.vala
index c64222f..62f8cc1 100644
--- a/gxml/Document.vala
+++ b/gxml/Document.vala
@@ -609,5 +609,11 @@ namespace GXml {
                        }
                        return null;
                }
+
+               internal Node copy_node (Node foreign_node) {
+                       foreign_node.owner_document.sync_dirty_elements ();
+                       Xml.Node *our_copy_xml = ((BackedNode)foreign_node).node->doc_copy (this.xmldoc, 1);
+                       return this.lookup_node (our_copy_xml); // inducing a GXmlNode
+               }
        }
 }