old commit content and diff visualization

Hi, In ungit, we can see upcoming change in the work in progress commit with a nice diff view. But in old commit, we can't show it anymore.

Actually i need to look on my distant repo in github or gitlab to inspect my old code, or i use command line for not pushed commit.

It could be usefull when i discover a bug in my code and want to find where i add it to fork or branch and fix it before merging back.