i18n: meta strings are not translated with docutils-0.18

i18n feature for meta strings does not work if docutils-0.18 used.

Note: Since docutils-0.18, patch for meta directive is no longer
needed because it uses a picklable meta nodes; ``docutils.nodes.meta``.

1 files changed, 3 insertions, 4 deletions

diff --git a/sphinx/directives/patches.py b/sphinx/directives/patches.py
index f01423a88..5308b2838 100644
--- a/sphinx/directives/patches.py
+++ b/sphinx/directives/patches.py
@@ -29,13 +29,10 @@ from sphinx.util.osutil import SEP, os_path, relpath
 from sphinx.util.typing import OptionSpec
 
 try:
-    from docutils.nodes import meta as meta_node  # type: ignore
     from docutils.parsers.rst.directives.misc import Meta as MetaBase  # type: ignore
 except ImportError:
     # docutils-0.17 or older
     from docutils.parsers.rst.directives.html import Meta as MetaBase
-    from docutils.parsers.rst.directives.html import MetaBody
-    meta_node = MetaBody.meta
 
 if TYPE_CHECKING:
     from sphinx.application import Sphinx
@@ -74,8 +71,10 @@ class Meta(MetaBase, SphinxDirective):
     def run(self) -> List[Node]:
         result = super().run()
         for node in result:
+            # for docutils-0.17 or older.  Since docutils-0.18, patching is no longer needed
+            # because it uses picklable node; ``docutils.nodes.meta``.
             if (isinstance(node, nodes.pending) and
-               isinstance(node.details['nodes'][0], meta_node)):
+               isinstance(node.details['nodes'][0], addnodes.docutils_meta)):
                 meta = node.details['nodes'][0]
                 meta.source = self.env.doc2path(self.env.docname)
                 meta.line = self.lineno