P: Hover Preview of Curves

It would be nice to not have to apply a curve to see the changes to the image. We can hover on presets and profiles and see the change in real time but curves must be manually applied in order to see the change. 

This is helpful because as I've made and saved curves over time, I often forget to experiment with them becuase of how arduous it now feels to try them, where with presets and profiles it's a quick hover to get a sample of the changes that would be made to the image.