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QtWidgets.pyi indicates that QApplication.activeModalWidget returns a QWidget:

def activeModalWidget() -> PySide6.QtWidgets.QWidget: ...

However, this code demonstrates that activeModalWidget can also return None:

from PySide6.QtWidgets import QApplication
app = QApplication()
widget = app.activeModalWidget()
print(type(widget))  # prints "<class 'NoneType'>"

So the correct type hint would be

[...] -> PySide6.QtWidgets.QWidget | None: ...

The same is true for many other functions, one example being QTableWidget.item.

is duplicated by

PYSIDE-2519 [Type Hints] Return type for QLayout.itemAtPosition must be optional

PYSIDE-2566 Respect "None" in type stubs

relates to

PYSIDE-1467 QCoreApplication.instance() should hint return as optional

PYSIDE-2638 Segfault when adding None to Layout

PYSIDE-2941 Type hints: QWidget.window() indicates incorrect optionality

For Gerrit Dashboard: PYSIDE-2440
#	Subject	Branch	Project	Status	CR	V
603243,3	type hints: Fix some return annotations which should be optional	dev	pyside/pyside-setup	Status: MERGED	+2	+1
603345,2	type hints: Fix some return annotations which should be optional	6.8	pyside/pyside-setup	Status: MERGED	+2	0
609303,3	type hints: Fix some return annotations which should be optional, amended	dev	pyside/pyside-setup	Status: MERGED	+2	0
609322,2	type hints: Fix some return annotations which should be optional, amended	6.8	pyside/pyside-setup	Status: MERGED	+2	0