Fix LayeredDirty.get_clip() return type annotation

Author: aatle

buildconfig/stubs/pygame/sprite.pyi

@@ -144,7 +144,7 @@ class LayeredDirty(LayeredUpdates[_DirtySpriteT]):
     def clear(self, surface: Surface, bgd: Surface) -> None: ...  # type: ignore[override]
     def repaint_rect(self, screen_rect: RectLike) -> None: ...
     def set_clip(self, screen_rect: Optional[RectLike] = None) -> None: ...
-    def get_clip(self) -> Union[FRect, Rect]: ...
+    def get_clip(self) -> Optional[Union[FRect, Rect]]: ...
     def set_timing_threshold(self, time_ms: SupportsFloat) -> None: ...
     @deprecated(
         "since 2.1.1. Use `pygame.sprite.LayeredDirty.set_timing_threshold` instead"

src_py/sprite.py

@@ -1323,7 +1323,7 @@ def set_clip(self, screen_rect=None):
     def get_clip(self):
         """get the area where drawing will occur
 
-        LayeredDirty.get_clip(): return Rect
+        LayeredDirty.get_clip(): return Rect or None
 
         """
         return self._clip