because it's an automated piece of software making decisions about what is an "equal diff" and what is a "difference diff" because a diff no longer means just a change, it now has to be a meaningful enough change.. If you removed something like `if (true)` or whatever, that's still a diff that could have some importance and/or unknown consequences. I appreciate the value, but the fact that it allows refactoring to be a non-diff would worry me in the long run I think.
Difftastic is only ignoring whitespace that isn't significant. If you remove `if (true)`, it will get highlighted.
With a textual diff today, your only choices are 'highlight all whitespace changes' (e.g the git default) or 'ignore all whitespace' (e.g. diff --word-diff).
If difftastic says there are no changes, then both files have the same parse tree and the same comments.
