Remove old compatibility alias _BufferWithLen (python#14151)

Author: srittau

stdlib/_typeshed/__init__.pyi

@@ -298,9 +298,6 @@ class SupportsGetItemBuffer(SliceableBuffer, IndexableBuffer, Protocol):
 
 class SizedBuffer(Sized, Buffer, Protocol): ...
 
-# for compatibility with third-party stubs that may use this
-_BufferWithLen: TypeAlias = SizedBuffer  # not stable  # noqa: Y047
-
 ExcInfo: TypeAlias = tuple[type[BaseException], BaseException, TracebackType]
 OptExcInfo: TypeAlias = ExcInfo | tuple[None, None, None]
 

stubs/python-xlib/Xlib/protocol/display.pyi

@@ -1,4 +1,4 @@
-from _typeshed import _BufferWithLen
+from _typeshed import SizedBuffer
 from socket import socket
 from typing import Literal, TypeVar, overload
 
@@ -16,7 +16,7 @@ class bytesview:
     @overload
     def __init__(self, data: bytes | bytesview, offset: int, size: int) -> None: ...
     @overload
-    def __init__(self, data: _BufferWithLen, offset: int = 0, size: int | None = None) -> None: ...
+    def __init__(self, data: SizedBuffer, offset: int = 0, size: int | None = None) -> None: ...
     @overload
     def __getitem__(self, key: slice) -> bytes: ...
     @overload