In a nut shell, in tabbed workspace when we drag images from their tabs over a working image the window from the new tab covers up the working image. The one that is pulled down has a large amount of gray border dimension outside of the actual image. If this grey border could be eliminated and just have the window surround only the image, the window would not be so big and cover the working image.This is happening only with cropped images. as per picture below. the window that is over the working image was cropped first and then dragged down.