Strange zoom behaviour

[andreped]

If you render a WSI and zoom as far in as you can, you will observe that you are unable to zoom out again. The rendered image just becomes black, and completely stops the user from further interacting with the image.

What is done in other softwares, like QuPath, is to have a limit on how far you can zoom in. Perhaps we should do something similar?

[andreped]

I just observed that if we zoom far-far out, it becomes quite challenging to find the WSI again. Especially if we zoom out to an extent where we cannot see the WSI anymore, more the view slightly and try to re-zoom in to the same level.

Perhaps we should limit both the positive and negative zoom, to improve user-friendliness.