tkinter: Require passing in a callback function to .after() (#11013)

stdlib/tkinter/__init__.pyi

@@ -347,9 +347,8 @@ class Misc:
     def tk_focusFollowsMouse(self) -> None: ...
     def tk_focusNext(self) -> Misc | None: ...
     def tk_focusPrev(self) -> Misc | None: ...
-    @overload
-    def after(self, ms: int, func: None = None) -> None: ...
-    @overload
+    # .after() can be called without the "func" argument, but it is basically never what you want.
+    # It behaves like time.sleep() and freezes the GUI app.
     def after(self, ms: int | Literal["idle"], func: Callable[..., object], *args: Any) -> str: ...
     # after_idle is essentially partialmethod(after, "idle")
     def after_idle(self, func: Callable[..., object], *args: Any) -> str: ...

tests/stubtest_allowlists/py3_common.txt

@@ -123,6 +123,7 @@ tkinter.simpledialog.TkVersion
 tkinter.tix.[A-Z_]+
 tkinter.tix.TclVersion
 tkinter.tix.TkVersion
+tkinter.Misc.after  # we intentionally don't allow everything that "works" at runtime
 traceback.TracebackException.from_exception  # explicitly expanding arguments going into TracebackException __init__
 typing(_extensions)?\.IO\.__next__  # Added because IO streams are iterable. See https://github.com/python/typeshed/commit/97bc450acd60c1bcdafef3ce8fbe3b95a9c0cac3
 typing.type_check_only  # typing decorator that is not available at runtime