so does it fucking work now?

releases/__init__.py

@@ -593,12 +593,11 @@ def visit_bullet_list(self, node):
         # one being visited doesn't appear to apply.
         if self.found_changelog:
             return
-        # The bullet list's parent should be a 'section' node with 'ids'
-        # attribute derived from the original document name (even in singlehtml
-        # mode). If we don't see this, move on.
-        print(f"docnames: {self.docnames!r}", file=sys.stderr)
-        print(f"node.parent.attributes.ids: {node.parent.attributes['ids']!r}", file=sys.stderr)
-        if not set(self.docnames).intersection(node.parent.attributes["ids"]):
+        # Also short circuit if we're in singlepage mode and the node's parent
+        # doesn't seem to be named after an expected changelog docname. In this
+        # mode, this is the earliest we can actually tell whether a given
+        # bullet list is or is not "the changelog".
+        if self.app._is_singlepage and node.parent.attributes.get('docname', None) not in self.docnames:
             return
         # At this point, we can safely assume the node we're visiting is the
         # right one to mutate.
@@ -617,10 +616,9 @@ def generate_changelog(app, doctree, docname):
     # Ensure we still work mostly-correctly in singlehtml builder situations
     # (must use name substring test as RTD's singlehtml builder doesn't
     # actually inherit from Sphinx's own!)
-    is_singlepage = "singlehtml" in app.builder.name
-    changelog_names = ["index"] if is_singlepage else desired_docnames
-    print(f"is_singlepage: {is_singlepage!r}", file=sys.stderr)
-    print(f"changelog_names: {changelog_names!r}", file=sys.stderr)
+    # NOTE: monkeypatching onto the builder for easier reuse deeper in stack
+    app._is_singlepage = "singlehtml" in app.builder.name
+    changelog_names = ["index"] if app._is_singlepage else desired_docnames
     if docname not in changelog_names:
         return