core (xml_tools): new elementCopy method to shallow copy a domish.Element

sat/tools/xml_tools.py

@@ -1664,6 +1664,25 @@ def deferConfirm(*args, **kwargs):
 
 # Misc other funtions
 
+def elementCopy(element):
+    """Make a copy of a domish.Element
+
+    The copy will have its own children list, so other elements
+    can be added as direct children without modifying orignal one.
+    Children are not deeply copied, so if an element is added to a child or grandchild,
+    it will also affect original element.
+    @param element(domish.Element): Element to clone
+    """
+    new_elt = domish.Element(
+        (element.uri, element.name),
+        defaultUri = element.defaultUri,
+        attribs = element.attributes,
+        localPrefixes = element.localPrefixes)
+    new_elt.parent = element.parent
+    new_elt.children = element.children[:]
+    return new_elt
+
+
 def isXHTMLField(field):
     """Check if a data_form.Field is an XHTML one"""
     return (field.fieldType is None and field.ext_type == u"xml" and