Preview image of stacked dng or first RAW file in the folder when rolling over a folder

The more images and folders you have, the more cumbersome it becomes to remember which folder contains which file (unless you are really carefully renaming your folders).

It would be amazing if we could see a thumbnail of the stacked result and if there is no stacked result in a folder yet, of the first image of the folder, so that we don’t have to click on it to find out what it contains.