openpyxl: Reduce false-positives in Worksheet.__getitem__ (#11717)

Author: Avasam

stubs/openpyxl/openpyxl/worksheet/worksheet.pyi

@@ -87,10 +87,15 @@ class Worksheet(_WorkbookChild):
     @freeze_panes.setter
     def freeze_panes(self, topLeftCell: str | Cell | None = ...) -> None: ...
     def cell(self, row: int, column: int, value: str | None = None) -> Cell: ...
+    # An int is necessarily a row selection
     @overload
-    def __getitem__(self, key: int | slice) -> tuple[Cell, ...]: ...
+    def __getitem__(self, key: int) -> tuple[Cell, ...]: ...
+    # A slice is necessarily a row or rows, even if targetting a single cell
     @overload
-    def __getitem__(self, key: str) -> Any: ...  # AnyOf[Cell, tuple[Cell, ...]]
+    def __getitem__(self, key: slice) -> tuple[Any, ...]: ...  # tuple[AnyOf[Cell, tuple[Cell, ...]]]
+    # A str could be an individual cell, row, column or full range
+    @overload
+    def __getitem__(self, key: str) -> Any: ...  # AnyOf[Cell, tuple[Cell, ...], tuple[tuple[Cell, ...], ...]]
     def __setitem__(self, key: str, value: str) -> None: ...
     def __iter__(self) -> Iterator[tuple[Cell, ...]]: ...
     def __delitem__(self, key: str) -> None: ...