Fix #7409: Convert configuration values on late config-inited event

This changes a priority for config-inited handlers of core modules
to invoke them at the late of the event.  It allows extensions to
modify configurations.

CHANGES

@@ -33,6 +33,8 @@ Bugs fixed
 * #6564: html: a width of table was ignored on HTML builder
 * #7401: Incorrect argument is passed for :event:`env-get-outdated` handlers
 * #7355: autodoc: a signature of cython-function is not recognized well
+* #7409: intersphinx: ValueError is raised when an extension sets up
+  :confval:`intersphinx_mapping` on :event:`config-inited` event
 
 Testing
 --------

sphinx/builders/epub3.py

@@ -282,7 +282,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
                          ENUM('horizontal', 'vertical'))
 
     # event handlers
-    app.connect('config-inited', convert_epub_css_files)
+    app.connect('config-inited', convert_epub_css_files, priority=800)
     app.connect('builder-inited', validate_config_values)
 
     return {

sphinx/builders/html/__init__.py

@@ -1231,12 +1231,12 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_config_value('html4_writer', False, 'html')
 
     # event handlers
-    app.connect('config-inited', convert_html_css_files)
-    app.connect('config-inited', convert_html_js_files)
-    app.connect('config-inited', validate_html_extra_path)
-    app.connect('config-inited', validate_html_static_path)
-    app.connect('config-inited', validate_html_logo)
-    app.connect('config-inited', validate_html_favicon)
+    app.connect('config-inited', convert_html_css_files, priority=800)
+    app.connect('config-inited', convert_html_js_files, priority=800)
+    app.connect('config-inited', validate_html_extra_path, priority=800)
+    app.connect('config-inited', validate_html_static_path, priority=800)
+    app.connect('config-inited', validate_html_logo, priority=800)
+    app.connect('config-inited', validate_html_favicon, priority=800)
     app.connect('builder-inited', validate_math_renderer)
     app.connect('html-page-context', setup_js_tag_helper)
 

sphinx/builders/latex/__init__.py

@@ -536,7 +536,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.setup_extension('sphinx.builders.latex.transforms')
 
     app.add_builder(LaTeXBuilder)
-    app.connect('config-inited', validate_config_values)
+    app.connect('config-inited', validate_config_values, priority=800)
 
     app.add_config_value('latex_engine', default_latex_engine, None,
                          ENUM('pdflatex', 'xelatex', 'lualatex', 'platex', 'uplatex'))

sphinx/config.py

@@ -478,11 +478,11 @@ def check_master_doc(app: "Sphinx", env: "BuildEnvironment", added: Set[str],
 
 
 def setup(app: "Sphinx") -> Dict[str, Any]:
-    app.connect('config-inited', convert_source_suffix)
-    app.connect('config-inited', init_numfig_format)
-    app.connect('config-inited', correct_copyright_year)
-    app.connect('config-inited', check_confval_types)
-    app.connect('config-inited', check_primary_domain)
+    app.connect('config-inited', convert_source_suffix, priority=800)
+    app.connect('config-inited', init_numfig_format, priority=800)
+    app.connect('config-inited', correct_copyright_year, priority=800)
+    app.connect('config-inited', check_confval_types, priority=800)
+    app.connect('config-inited', check_primary_domain, priority=800)
     app.connect('env-get-outdated', check_master_doc)
 
     return {

sphinx/ext/intersphinx.py

@@ -367,7 +367,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_config_value('intersphinx_mapping', {}, True)
     app.add_config_value('intersphinx_cache_limit', 5, False)
     app.add_config_value('intersphinx_timeout', None, False)
-    app.connect('config-inited', normalize_intersphinx_mapping)
+    app.connect('config-inited', normalize_intersphinx_mapping, priority=800)
     app.connect('builder-inited', load_mappings)
     app.connect('missing-reference', missing_reference)
     return {

sphinx/extension.py

@@ -60,7 +60,7 @@ def verify_needs_extensions(app: "Sphinx", config: Config) -> None:
 
 
 def setup(app: "Sphinx") -> Dict[str, Any]:
-    app.connect('config-inited', verify_needs_extensions)
+    app.connect('config-inited', verify_needs_extensions, priority=800)
 
     return {
         'version': 'builtin',

sphinx/registry.py

@@ -453,7 +453,7 @@ def merge_source_suffix(app: "Sphinx", config: Config) -> None:
 
 
 def setup(app: "Sphinx") -> Dict[str, Any]:
-    app.connect('config-inited', merge_source_suffix)
+    app.connect('config-inited', merge_source_suffix, priority=800)
 
     return {
         'version': 'builtin',