P: Can I limit face detect only to area within my crop?

I love face detection.

However, it is common for my subjects to be in a crowd, such as and athlete in a sporting event. Face detection identifies many faces in the image which I have to reject/delete. When I crop the image, the face tag remains active even though it is not in the viewable range of the final image. I would like to have an option that, when activated, LR will ignore and delete the face tags that are outside the range of the crop. This would save me a boat load of time spent rejecting the large number of unwanted face to tag.

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