Remove `addnodes.document`

sphinx/addnodes.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 from typing import TYPE_CHECKING
 
 from docutils import nodes
+from docutils.nodes import document  # NoQA: F401
 
 if TYPE_CHECKING:
     from collections.abc import Sequence
@@ -16,22 +17,6 @@ if TYPE_CHECKING:
     from sphinx.util.typing import ExtensionMetadata
 
 
-class document(nodes.document):
-    """The document root element patched by Sphinx.
-
-    This fixes that document.set_id() does not support a node having multiple node Ids.
-    see https://sourceforge.net/p/docutils/patches/167/
-
-    .. important:: This is only for Sphinx internal use.  Please don't use this
-                   in your extensions.  It will be removed without deprecation period.
-    """
-
-    def set_id(
-        self, node: Element, msgnode: Element | None = None, suggested_prefix: str = ''
-    ) -> str:
-        return super().set_id(node, msgnode, suggested_prefix)
-
-
 class translatable(nodes.Node):
     """Node which supports translation.
 

sphinx/io.py

@@ -10,7 +10,6 @@ from docutils.readers import standalone
 from docutils.transforms.references import DanglingReferences
 from docutils.writers import UnfilteredWriter
 
-from sphinx import addnodes
 from sphinx.transforms import AutoIndexUpgrader, DoctreeReadEvent, SphinxTransformer
 from sphinx.transforms.i18n import (
     Locale,
@@ -76,7 +75,6 @@ class SphinxBaseReader(standalone.Reader):  # type: ignore[misc]
         for logging.
         """
         document = super().new_document()
-        document.__class__ = addnodes.document  # replace the class with patched version
 
         # substitute transformer
         document.transformer = SphinxTransformer(document)

sphinx/util/docutils.py

@@ -813,8 +813,6 @@ def new_document(source_path: str, settings: Any = None) -> nodes.document:
         settings = copy(cached_settings)
 
     # Create a new instance of nodes.document using cached reporter
-    from sphinx import addnodes
-
-    document = addnodes.document(settings, reporter, source=source_path)
+    document = nodes.document(settings, reporter, source=source_path)
     document.note_source(source_path, -1)
     return document