In the image viewer the zoom preview box in the lower right doesn't show the image that is currently active in the image viewer.

[wacki]

I assume the lower right zoom preview box should be displaying the image that is currently active in the image viewer.
However if I only used a load and binarize node then the preview always showed the original image and not the result of the binarize node.

Reproduction of the bug:

1. Add load node
2. Add binarize node
3. Press play
4. Go to the image viewer, select binarize.
5. The zoom box should now show a zoomed in section of the load image tab rather than the binarize one
6. Now add a Gaussian low pass (that's the only one I tested it with)
7. Add the binarize result as input of the Gauss node
8. In the image viewer go to the Gauss tab
9. Tweak the Sigma of the Gauss so that a result is generated
10. Now the zoom box should display the result of the Gauss node correctly

Working zoom preview: