warning: compressing over-full page by 12.4 staff-spaces

[David Kastrup]

What's up with

    warning: compressing over-full page by 12.4 staff-spaces

here?  There is more than enough space to put one system more to the
next page, and 12 staff spaces?

Page breaks are supposed to be done with full skylines, aren't they?
Sorry for the entirely non-minimal example here.  I have no idea how to
boil this down to fit, but this is not a bug report (yet?).  I just want
input on whether something like this can reasonably be expected to
happen, and if so why, or whether this is indeed bug report country.

Not including the PDF because of 800kB size.  Ugh.

another.ly
Description: Text Data

-- 
David Kastrup