Forgot to also use a GtkBorder pointer for get_page_y_offset() argument.

3 jobs for 700-mouse-scrolling-are-laggy-with-big-pdf-continuous-mode in 17 minutes and 47 seconds (queued for 4 seconds)
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passed #87665
flatpak

00:17:46

manual #87664
allowed to fail manual
gtk-doc
passed #87663
master

00:04:27