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python: add documentation signatures for hand-wrapped highgui functions - #30549 Port of #30508 to 5.x `createTrackbar`, `createButton` and `setMouseCallback` are registered by hand in `cv2.cpp`, so `gen2.py` never sees them and they end up with no Python signature in the generated docs. Argument names come from the keyword lists in `cv2_highgui.cpp`, which is why `setMouseCallback` reads `window_name, on_mouse` rather than the camelCase in its `cv2.cpp` docstring. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake