Automatically show git changes

[TolstoyDotCom]

The previous behavior was that if I simply ran diffuse in the root of a git repo that had changes, it would show the changed files. If I use diffuse -c HEAD or diffuse -c 123 (where 123 is the hash of the last commit), I get the previous changes, not the currently changed files.

What do I have to do to get the old behavior?

Also, is there an alternative to flatpak? Installing this 1.7Meg package resulted in a download of over 2Gigs.