Browser thumbnails based on the cropped image instead of the full one

With the advent of very high resolution cameras, some of us shoot first and compose then. This leads to situation, that the final image is just a relatively small cut of the original image. In the browser, I would like to have an option to see the thumbnails based on the cropped version of the image, instead of the full image. A toggle switch for this would be nice, a preferences settings would work as well.

Without this feature, often I see lot of black squares with miniature images somewhere inside. The most of the UI is depleted and the useful content is hardly visible.

… and I did the obvious mistake of reporting a feature request here. I will repost it on GitHub issue tracker later on.