Created attachment 115146 [details] crop mode add-on include crop handles to crop image using a crop rectangle. As you can see in my attachment, now when you move crop handles on a picture the full picture is shown with the portions outside of the crop area grayed out until dragged into new crop position.
I’m always wondering why people doesn’t seem to bother searching a bit to look it their bug is already reported. Besides, we’re already working on that. *** This bug has been marked as a duplicate of bug 34555 ***