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77d9a8e69c
Same change as the 5.x port, to keep the two branches in sync.
The wrapper parses window_name, on_mouse and param, but the cv2.cpp help
text and the typing stub in api_refinement.py both say windowName and
onMouse, so the stub promises keywords the runtime rejects:
>>> cv2.setMouseCallback(windowName="w", onMouse=cb)
TypeError: function missing required argument 'window_name' (pos 1)
createTrackbar is left alone: it is registered METH_VARARGS, so its
arguments cannot be passed by keyword at all.
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