Steps to reproduce:
1. Have an image. Use the drop tool to make it a bit smaller.
2. Crop it again, starting at the point where the dialog has last been.

Actual result:
The crop tool dialog pops up where is has last been, blocking my view so that I
have to stop cropping and first move that darn dialog out of the way.

Expected result:
If the crop dialog would pop up where it would block the mouse pointer (or quite
near it), it should move a bit away so that the user doesn't need to stop in
order to move that dialog out of the way.