autodoc: Fix default option parsing (#14198)

Author: AA-Turner

CHANGES.rst

@@ -26,6 +26,8 @@ Bugs fixed
  Patch by Adam Turner
 * Fix tests for Python 3.15.
  Patch by Adam Turner
+* #14089: autodoc: Fix default option parsing.
+ Patch by Adam Turner
 
 Testing
 -------

sphinx/ext/autodoc/_directive_options.py

@@ -275,7 +275,6 @@ def merge_members_option(options: dict[str, Any]) -> None:
  'private-members': members_option,
  'special-members': members_option,
  'member-order': member_order_option,
- 'show-inheritance': bool_option,
 }
 _OPTION_SPEC_MODULE_SPECIFIC: Final[OptionSpec] = {
  'ignore-module-all': bool_option,
@@ -286,6 +285,7 @@ def merge_members_option(options: dict[str, Any]) -> None:
 }
 _OPTION_SPEC_CLASS_SPECIFIC: Final[OptionSpec] = {
  'class-doc-from': class_doc_from_option,
+ 'show-inheritance': bool_option,
  'inherited-members': inherited_members_option,
 }
 _OPTION_SPEC_ASSIGNMENT: Final[OptionSpec] = _OPTION_SPEC_COMMON | {
@@ -299,7 +299,9 @@ def merge_members_option(options: dict[str, Any]) -> None:
 _OPTION_SPECS: Final[Mapping[_AutodocObjType, OptionSpec]] = {
  'module': _OPTION_SPEC_HAS_MEMBERS
  | _OPTION_SPEC_MODULE_SPECIFIC
+ | {'show-inheritance': bool_option} # special case
  | {'inherited-members': inherited_members_option} # special case
+ | {'no-value': bool_option} # special case
  | _OPTION_SPEC_DEPRECATED,
  'class': _OPTION_SPEC_HAS_MEMBERS
  | _OPTION_SPEC_CLASS_SPECIFIC