Add an _Image protocol to tkinter. (#4766)

Author: rchen152

stdlib/3/tkinter/__init__.pyi

@@ -95,7 +95,7 @@ _Cursor = Union[str, Tuple[str], Tuple[str, str], Tuple[str, str, str], Tuple[st
 _EntryValidateCommand = Union[
     Callable[[], bool], str, _TkinterSequence[str]
 ]  # example when it's sequence:  entry['invalidcommand'] = [entry.register(print), '%P']
-_ImageSpec = Union[Image, str]  # str can be from e.g. tkinter.image_names()
+_ImageSpec = Union[_Image, str]  # str can be from e.g. tkinter.image_names()
 _Padding = Union[
     _ScreenUnits,
     Tuple[_ScreenUnits],
@@ -2831,6 +2831,12 @@ class OptionMenu(Menubutton):
     # configure, config, cget are inherited from Menubutton
     # destroy and __getitem__ are overrided, signature does not change
 
+class _Image(Protocol):
+    tk: _tkinter.TkappType
+    def __del__(self) -> None: ...
+    def height(self) -> int: ...
+    def width(self) -> int: ...
+
 class Image:
     name: Any
     tk: _tkinter.TkappType