Created attachment 51970 [details]
"fit to window" working correctly before

Version:           1.4.0 (using KDE 4.5.1) 
OS:                Linux

Using the "fit to window" button while using any tool (e.g. auto-correction, noise reduction, curve editor, etc) does indeed zoom to 100%, but the scrollbars are not updated, which means there basically are no scrollbars, and trying to pan the image with the middle mouse button does not work either.

While not using any tool, the button works as expected: if you click it, the image zooms to 100%, the scrollbars are updated accordingly, and you can pan using the middle mouse button.

Reproducible: Always

Steps to Reproduce:
1- Open image
2- Click on any tool so you get an extra tab on the far right
3- Try using the "fit to window" button on the bottom, next to "zoom to 100%" and "zoom out".

Actual Results:  
Image zooms to 100% but is frozen there - no scrollbars, no panning.

Expected Results:  
It should allow panning and the scrollbars should reflect that now large areas of the image are not visible because its larger than the viewable area.