https://codereview.appspot.com/351880043/diff/20001/lily/page-turn-page-breaking.cc
File lily/page-turn-page-breaking.cc (right):
https://codereview.appspot.com/351880043/diff/20001/lily/page-turn-page-breaking.cc#newcode37
lily/page-turn-page-breaking.cc:37: bool page_breakable = scm_is_symbol
(g->get_property ("page-break-permission"));
This always looks up three properties. The previous code likely stopped
after the first. Lookups are actually expensive.
https://codereview.appspot.com/351880043/
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