Restore Sphinx 5 nodes.Element copying behaviour

Author: AA-Turner

sphinx/util/nodes.py

@@ -608,3 +608,18 @@ def process_only_nodes(document: Node, tags: Tags) -> None:
  # the only node, so we make sure docutils can transfer the id to
  # something, even if it's just a comment and will lose the id anyway...
  node.replace_self(nodes.comment())
+
+
+def _copy_except__document(self: Element) -> Element:
+ """Monkey-patch ```nodes.Element.copy``` to not copy the ``_document``
+ attribute.
+
+ xref: https://github.com/sphinx-doc/sphinx/issues/11116#issuecomment-1376767086
+ """
+ newnode = self.__class__(rawsource=self.rawsource, **self.attributes)
+ newnode.source = self.source
+ newnode.line = self.line
+ return newnode
+
+
+nodes.Element.copy = _copy_except__document # type: ignore