Different modified icon for diffs that only change index

### The feature request

When patches are modified, sometimes the indexes of other patches change, creating useless diffs for the file, see image:

https://i.imgur.com/m9Gp8Nv.png

it should show a different icon color than yellow since nothing really changed, just the git index, like how git diff has different colors if a line changed slightly or fully

### Proposed solution

This makes it easier to review commits at a glance, since you can skip the unnecessary files with no changes (except for the aforementioned git index value)

### Additional context

I made concept art of how this feature would look, as you can see it would be very useful to see at a glance to see which files have actual changes and which just have "changes"

https://i.imgur.com/B2mEYjE.png