The change described as "Fix page breaks bug" apparently doesn't just fix the long paragraph bug. As far as I can determine it completely disables intelligent paragraph break handling. After applying the patch all pages are completely filled out, having the same effect as setting widows and orphans to 0 in CSS, even in books with (the default) higher settings.
Actually I like that, because I had been adding explicit widows and orphans settings to all recent books, which will not be necessary after this. But people who like some control over widows and orphans, or even the default settings, might reconsider or do some more experiments first.
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