Updates:
Blockedon: lilypond:3160
Comment #5 on issue 3156 by [email protected]: Patch: Prevents vertical
axis groups with empty skylines
http://code.google.com/p/lilypond/issues/detail?id=3156
This happens to hide the bug in issue 3160, so let's at least find out what
went wrong there before doing this.
Somehow, this input was spaced properly in version 2.16,
whereas we know that lines with empty extents were not removed (i.e., no
VerticalAxisGroup::suicide() ) because Trevor B's use of zero-extents was
working then
<https://lists.gnu.org/archive/html/lilypond-devel/2013-02/msg00032.html>
