Merge pull request #26022 from Kumataro:fix26016

Imgproc: use double to determine whether the corners points are within src #26022

close #26016
Related https://github.com/opencv/opencv_contrib/pull/3778

### 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
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/stitching/test/test_matchers.cpp

@@ -67,9 +67,11 @@ TEST(SurfFeaturesFinder, CanFindInROIs)
     int tl_rect_count = 0, br_rect_count = 0, bad_count = 0;
     for (const auto &keypoint : roi_features.keypoints)
     {
-        if (rois[0].contains(keypoint.pt))
+        // Workaround for https://github.com/opencv/opencv/issues/26016
+        // To keep its behaviour, keypoint.pt casts to Point_<int>.
+        if (rois[0].contains(Point_<int>(keypoint.pt)))
             tl_rect_count++;
-        else if (rois[1].contains(keypoint.pt))
+        else if (rois[1].contains(Point_<int>(keypoint.pt)))
             br_rect_count++;
         else
             bad_count++;