Mark stub-only private symbols as @type_check_only in third-party stubs (#14545)

stubs/python-xlib/Xlib/display.pyi

@@ -1,7 +1,7 @@
 from collections.abc import Callable, Iterable, Sequence
 from re import Pattern
 from types import FunctionType, MethodType
-from typing import Any, Literal, TypedDict, overload
+from typing import Any, Literal, TypedDict, overload, type_check_only
 from typing_extensions import TypeAlias
 
 from Xlib import error
@@ -22,6 +22,7 @@ _ResourceBaseClass: TypeAlias = (
 )
 
 # Is the type of the `_resource_baseclasses` variable, defined in this file at runtime
+@type_check_only
 class _ResourceBaseClassesType(TypedDict):  # noqa: Y049
     resource: type[resource.Resource]
     drawable: type[drawable.Drawable]

stubs/python-xlib/Xlib/rdb.pyi

@@ -1,7 +1,7 @@
 from _typeshed import SupportsDunderGT, SupportsDunderLT, SupportsRead
 from collections.abc import Iterable, Mapping, Sequence
 from re import Pattern
-from typing import Any, Final, Protocol, TypeVar, overload
+from typing import Any, Final, Protocol, TypeVar, overload, type_check_only
 from typing_extensions import TypeAlias
 
 from Xlib.display import Display
@@ -15,6 +15,7 @@ _DB: TypeAlias = dict[str, tuple[_DB, ...]]
 # so this is a slightly less precise version of the _DB alias for parameter annotations
 _DB_Param: TypeAlias = dict[str, Any]
 
+@type_check_only
 class _SupportsComparisons(SupportsDunderLT[_T_contra], SupportsDunderGT[_T_contra], Protocol[_T_contra]): ...
 
 comment_re: Final[Pattern[str]]