update _CursesWindow to the runtime name "window" (#12744)

Prior to 3.8 the underlying C class was not given a name in
python, so typeshed added _CursesWindow to use it as a type.
Now that it has a name in python, typeshed should use that name.

We can keep _CursesWindow as an alias, for anyone using that
already.

stdlib/curses/__init__.pyi

@@ -1,5 +1,5 @@
 from _curses import *
-from _curses import _CursesWindow as _CursesWindow
+from _curses import window as window
 from collections.abc import Callable
 from typing import TypeVar
 from typing_extensions import Concatenate, ParamSpec
@@ -19,4 +19,9 @@ COLS: int
 COLORS: int
 COLOR_PAIRS: int
 
-def wrapper(func: Callable[Concatenate[_CursesWindow, _P], _T], /, *arg: _P.args, **kwds: _P.kwargs) -> _T: ...
+def wrapper(func: Callable[Concatenate[window, _P], _T], /, *arg: _P.args, **kwds: _P.kwargs) -> _T: ...
+
+# typeshed used the name _CursesWindow for the underlying C class before
+# it was mapped to the name 'window' in 3.8.
+# Kept here as a legacy alias in case any third-party code is relying on it.
+_CursesWindow = window

stdlib/curses/panel.pyi

@@ -1,4 +1,4 @@
-from _curses import _CursesWindow
+from _curses import window
 
 version: str
 
@@ -9,14 +9,14 @@ class _Curses_Panel:  # type is <class '_curses_panel.curses panel'> (note the s
     def hidden(self) -> bool: ...
     def hide(self) -> None: ...
     def move(self, y: int, x: int) -> None: ...
-    def replace(self, win: _CursesWindow) -> None: ...
+    def replace(self, win: window) -> None: ...
     def set_userptr(self, obj: object) -> None: ...
     def show(self) -> None: ...
     def top(self) -> None: ...
     def userptr(self) -> object: ...
-    def window(self) -> _CursesWindow: ...
+    def window(self) -> window: ...
 
 def bottom_panel() -> _Curses_Panel: ...
-def new_panel(win: _CursesWindow, /) -> _Curses_Panel: ...
+def new_panel(win: window, /) -> _Curses_Panel: ...
 def top_panel() -> _Curses_Panel: ...
 def update_panels() -> _Curses_Panel: ...

stdlib/curses/textpad.pyi

@@ -1,11 +1,11 @@
-from _curses import _CursesWindow
+from _curses import window
 from collections.abc import Callable
 
-def rectangle(win: _CursesWindow, uly: int, ulx: int, lry: int, lrx: int) -> None: ...
+def rectangle(win: window, uly: int, ulx: int, lry: int, lrx: int) -> None: ...
 
 class Textbox:
     stripspaces: bool
-    def __init__(self, win: _CursesWindow, insert_mode: bool = False) -> None: ...
+    def __init__(self, win: window, insert_mode: bool = False) -> None: ...
     def edit(self, validate: Callable[[int], int] | None = None) -> str: ...
     def do_command(self, ch: str | int) -> None: ...
     def gather(self) -> str: ...