Fix #6213: ifconfig: contents after headings are not shown

CHANGES

@@ -63,6 +63,7 @@ Bugs fixed
 
 * #6230: Inappropriate node_id has been generated by glossary directive if term
   is consisted by non-ASCII characters
+* #6213: ifconfig: contents after headings are not shown
 
 Testing
 --------

doc/usage/extensions/ifconfig.rst

@@ -8,6 +8,11 @@
 
 This extension is quite simple, and features only one directive:
 
+.. warning::
+
+   This directive is designed to control only content of document.  It could
+   not control sections, labels and so on.
+
 .. rst:directive:: ifconfig
 
    Include content of the directive only if the Python expression given as an

sphinx/ext/ifconfig.py

@@ -23,6 +23,7 @@ from docutils import nodes
 
 import sphinx
 from sphinx.util.docutils import SphinxDirective
+from sphinx.util.nodes import nested_parse_with_titles
 
 if False:
     # For type annotation
@@ -48,8 +49,7 @@ class IfConfig(SphinxDirective):
         node.document = self.state.document
         self.set_source_info(node)
         node['expr'] = self.arguments[0]
-        self.state.nested_parse(self.content, self.content_offset,
-                                node, match_titles=True)
+        nested_parse_with_titles(self.state, self.content, node)
         return [node]