def take_picture(widget: QWidget, filename: str) -> str:
"""
Takes a screenshot and saves it to the
filename given, ensuring the call is processed
through a slot if the call is from a separate
thread
"""
if hasattr(widget, 'grab'):
pix = widget.grab()
else:
pix = QPixmap.grabWidget(widget)
success = pix.save(filename)
if not success:
raise RuntimeError(f"Error saving widget image to file '{filename}'")
