No way to make non-syntactic changes visible

(1) A description of the issue. A screenshot is often helpful too.

When there's only a non-syntactic diff (eg whitespace in perl, java, python source code), difft shows no syntactic changes.

However, for usage with git diff, I would like to see even those changes.

(2) A copy of what you're diffing.

n/a

(3) The version of difftastic you're using (see difft --version) and your operating system.

$ difft -V
Difftastic 0.55.0 (built with rustc 1.75.0)

Running on MacOS, aarch64