With -h20 I get:

-        <ds:KeyName>foo.work.se</ds:KeyName>
-        <ds:KeyName>splat.work.se</ds:KeyName>
+        <ds:KeyName>foo-test.work.se</ds:KeyName>
[download]

So I experimented a bit with other heuristic values, trying to find a setting which would give me

-        <ds:KeyName>foo.work.se</ds:KeyName>
+        <ds:KeyName>foo-test.work.se</ds:KeyName>
+                       ^^^^^
-        <ds:KeyName>splat.work.se</ds:KeyName>
[download]

and found that I get the "classic" diff output for values in the range 2-49, with heuristic values of 1 or 50+ reverting to the original output. Since ccdiff -h describes -h n as "Horizontal char diff treshold"¹, I'm guessing that's because the smallest chunks taken in the original output are 1 character, while the complete line (with the real hostname) is 50 characters. Is that a correct description of how the heuristic works or is it just a coincidence?

¹ When I pasted that, my spellcheck caught a typo in "treshold" - it's missing an "h".

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