Attached patch is an attempt to make the bounding box of image-crop more noticeable. If you're using image-crop in an image that is mostly white, then it is very hard to notice the bounding box in a light theme. I looked for a way to draw a border around the lines in svg but was unable to find anything so I settled for drawing a rectangle and darkening the inside of that rectangle. Alternatively, one can make the rectangle stroke red since it is probably rare to come across an image that is mostly red. Before and after can be tested on the attached image named "vector_addition.png"