The DisplayGeometry had a feature to constrain the zooming and the panning so that these interactions were not possible if the whole image was visible.

This feature has been moved to the CameraController when the DisplayGeometry was removed. However, the feature does not work as it used to!

In my case, the image is square (512*512) but the renderwindow is wider than high.
In this case, the height is constrained so that I cannot zoom out any further although I can still pan left and right.

In the original version, I was able to zoom out so far, that panning was no longer possible because the whole image was visible. Now, the whole height is visible, but the renderwindow is not high enough to display the whole width of the image.

So, there seems to be a bug in the method mitk::CameraController::ComputeMaxParallelScale() that should be fixed.
I was not able to check if this issue also occurs in the workbench because the code has not been used in a release yet, but I strongly think it does.