Fix sphinx-doc#8566: autodoc-process-docstring is emitted to the alia…

…s classes

On the refactoring of Documenter.add_content() method, the
autodoc-process-docstring event is emitted to the alias classes (called
as doc_as_attr in our code) unexpectedly.  Before the change, it has
never been emitted.

The event causes that extensions (ex. numpydoc) confused.  So this
reverts the change temporarily (during 3.4.x).

CHANGES

@@ -20,6 +20,8 @@ Bugs fixed
   annotations
 * #8568: autodoc: TypeError is raised on checking slots attribute
 * #8567: autodoc: Instance attributes are incorrectly added to Parent class
+* #8566: autodoc: The ``autodoc-process-docstring`` event is emmited to the
+  alias classes unexpectedly
 * #8565: linkcheck: Fix PriorityQueue crash when link tuples are not
   comparable
 

sphinx/ext/autodoc/__init__.py

@@ -587,10 +587,12 @@ def get_sourcename(self) -> str:
     def add_content(self, more_content: Optional[StringList], no_docstring: bool = False
                     ) -> None:
         """Add content from docstrings, attribute documentation and user."""
-        if no_docstring:
-            warnings.warn("The 'no_docstring' argument to %s.add_content() is deprecated."
-                          % self.__class__.__name__,
-                          RemovedInSphinx50Warning, stacklevel=2)
+        # Suspended temporarily (see https://github.com/sphinx-doc/sphinx/pull/8533)
+        #
+        # if no_docstring:
+        #     warnings.warn("The 'no_docstring' argument to %s.add_content() is deprecated."
+        #                   % self.__class__.__name__,
+        #                   RemovedInSphinx50Warning, stacklevel=2)
 
         # set sourcename and add content from attribute documentation
         sourcename = self.get_sourcename()
@@ -1661,8 +1663,9 @@ def add_content(self, more_content: Optional[StringList], no_docstring: bool = F
                     ) -> None:
         if self.doc_as_attr:
             more_content = StringList([_('alias of %s') % restify(self.object)], source='')
-
-        super().add_content(more_content)
+            super().add_content(more_content, no_docstring=True)
+        else:
+            super().add_content(more_content)
 
     def document_members(self, all_members: bool = False) -> None:
         if self.doc_as_attr: