git diff /difftool is not started for staged files

[kr-g]

currently there is no support for staged files and running diff or difftool.
gitonic supports showing diff for unstaged files only.

resolution A:
unstage the file and use then diff or difftool

resolution B:
use bash/ commandline and run

git diff --cached + filename(optional)

or

git difftool --cached + filename(optional)