In the instance that prompted the question, there's no line or break padding the code, and if the screen break hadn't been forced, the chapter would have ended with four more lines to spare on that particular screen.
It's nothing Calibre's adding, because I don't use it. And I tried setting widows and orphans to 1, and then to 0, and it's still occurring.
It doesn't happen often of late, hence my surprise at seeing it again. I was sure someone had proclaimed it "fixed" a couple of releases ago.
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