View https://github.com/jisaacks/GitGutter
I just installed this plugin to give it a whirl. I’m not sure how directly useful it will prove over time, and in fact may be more distracting than not, but I’ve gotten good about doing diff reviews before every commit and I’m hoping this adds a ‘glance’ level to help that process even more.
Essentially the plugin’s only job is to add a marker in the gutter for modifications since your last commit.