The ignoring of whitespace is problematic for git

[LevitatingBusinessMan]

So for the xth time now I accidentally commited a commit that included whitespace changes that I didn't catch because I used difft.

Here is an example of the output of diff vs difft on a dirty git. I modified the first line but also entered a newline and a space.

(arch) rein /t/x (master)  $ GIT_EXTERNAL_DIFF=difft git diff
x.c --- C
1 void main() {                                                 1 int main() {
2         //filler                                              2         //filler
3         //filler                                              3         //filler
4         //filler                                              4         //filler

(arch) rein /t/x (master)  $ git diff
diff --git a/x.c b/x.c
index 7482fcb..17ac454 100644
--- a/x.c
+++ b/x.c
@@ -1,7 +1,8 @@
-void main() {
+int main() {
        //filler
        //filler
        //filler
        int x;
-       int foo(x);
+
+       int foo( x);
 }

It's easy to see how one could accidentally commit whitespace changes that may not alter the AST but are still unwelcme changes.
I understand that difftastic stands out from other tools because it can read AST's, but is there no option to also show changes to whitespace? I mainly use difft in this scenario because of the syntax highlighting and the side-by-side display.

[dirkfeytons]

See also #637