I had a very large/high image http://code.google.com/p/freerct/source/browse/trunk/sprites_src/tracks/cars/template_allangle8bpp128.png
and gwenview that did not cover the entire screen (the top 1/4 was not used).

When zooming, the birds-eye appeared, using it, I could drag up from the bottom to the top of the image, and the image scrolled in the other direction as expected.
At the top of the window however, I could continue dragging to above and outside the window due to the big height of the image.



Reproducible: Always

Steps to Reproduce:
1. Put the image at your file system
2. Open dolphin, and click the image to load it into gwenview (non-full screen)
3. zoom to around 100%
4. grab the birds-eye view rectangle, and drag it up.
5. when you reach the top of the window, have not reached the top of the image
Actual Results:  
you can continue move upwards until you hit the top of the screen (or the top of the image probably). The birds-eye view rectangle becomes unavailable.

Expected Results:  
I would expect the top of the window to be the top of the image.

In particular, when you let go of the mouse button, the birds-eye view is out of reach.