linebreak after/before header

Hm, it seems to be catching false positives, and I can't see why. Any idea?

Hm, that's very strange. I'm doing a bunch of tests on those edits, and it seems that while any "=\n" test sets it off, "=\s?\n" regex tests don't...

There's something weird going on with those edits. In Special:AbuseLog/136 the edit_delta is 103 even though there's only 9 characters added.

Right. See also the added_lines and removed_lines on that page.

And I see you've worked around it. Thanks!