feature request: image 1:1 zoom

When checking the generated images we never know what's the correct zoom for an image. On top of not having a numeric zoom indicator in the UI, each image node can have it's own size and internal zoom to adapt to it. This is specially annoying if we are comparing images for example for upscaling.

I suggest that, when an image node (Save Image, load image, preview image...) is selected, if the user press number 1 in the keyboard, the view will auto zoom so the selected image is displayed with a zoom 1:1 ( 1x, 100%).
So, nothing changes in the workflow, and the selected image node is not rescaled or anything, it's just a matter of calculating the correct zoom of the viewer for the image selected.