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Fwd: git difftool does not give the --cached option

I have install the latest git version from the PPA:
$ git --version
git version 2.19.1
$ lsb_release -rd
Description: Ubuntu 16.04.5 LTS
Release: 16.04

However, trying to autocomplete git difftool --cached gives:
$ env -i bash --rcfile /etc/profile
$ . /usr/share/bash-completion/completions/git
$ git difftool --
--dir-diff          --extcmd=           --gui               --no-...
         --no-prompt         --symlinks          --tool-help
--tool=             --trust-exit-code

Please direct me on what would require more attention.
/usr/share/bash-completion/completions/git is the same as the
git@master/contrib/completion/git-completion.bash and e.g. here:

It seems that --cached exists.

(Side question: What is the "--no-..." option shown? I cannot seem to
find it anywhere in the documentation :/)

Ntentos Stavros