I'd like an addition choice besides fit and fill in the navigator panel. When selected the option should show the image at full size (100%) or fit the window, whichever is smaller.
I often work in the develop module with the left panel closed so don't have quick access to the navigator. I toggle between fit and whatever my current zoom level is by hitting the space bar. This us usally what I want -- except when I'm working with lower resolution images on a 5K monitor. In that case the fit option expands the image beyond the 100% zoom level and I wonder why the image is so fuzzy until I realize what is going on. I can use the keyboard shortcut to see a 100% view -- but then I lose whatever zoom level I was working in.
An option that tells fit to not expand images would be a suitable alternative.