Support using diffview for "entire git diff of the selected commit"

[jemag]

Currently doing <C-e> in diff_commit_file will open a terminal typing:
git diff 426a273~ 426a273

I would like to be able to instead just open diffview as usual with something like :DiffviewOpen -uno 426a273~..426a273 instead. This will provide the same differences between both commits across multiple files but in a more user-friendly way (or at least in my opinion).

[aaronhallaert]

Hi, thanks for creating the issues 😉
This is a good suggestion. I'll see if I can find a worthy alternative for people using fugitive instead of diffview to keep everything consistent.
Or I could check if diffview is present and fall back on the current behavior if it isn't installed (I'm not a fan of forcing people to use plugins).

[aaronhallaert]

Seems like :Gedit commit does the same thing for fugitive