Comment #6 on issue 2611 by [email protected]: Patch: delete unused properties: extra-[XY]-extent
http://code.google.com/p/lilypond/issues/detail?id=2611
Might be of interest for future LSR-updates: extra-X-extent is used in http://lsr.dsi.unimi.it/LSR/Item?id=231 But I think this snippet should be revised anyway.
