System information (version)

• OpenCV => 4.5.4
• Operating System / Platform => Windows 64 Bit
• Compiler => Visual Studio 2019

Detailed description

I’m new to openCV, and I tested my code using the cv::setTrackbarMax() function with opencv 4.5.4.
Using the Visual C++ (MSVC) debugger, I found that after executing the setTrackbarMax() function, the trackbar in the window was broken and I could not grab the trackbar to change its value.

The same phenomenon can be seen in the tutorial code “samples/cpp/falsecolor.cpp”
https://docs.opencv.org/4.5.3/d2/dcf/samples_2cpp_2falsecolor_8cpp-example.html

The following line in window_w32.cpp seems to cause the error.

In the above, should “range.end” be assigned to trackbar.maxval instead of “range.start”?

Thanks in advance.

Steps to reproduce

The same phenomenon can be seen in the tutorial code “samples/cpp/falsecolor.cpp”
https://docs.opencv.org/4.5.3/d2/dcf/samples_2cpp_2falsecolor_8cpp-example.html

(In my environment,

setTrackbarPos("colormap", winName, -1);

did not work correctly and I commented out the line. )

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc