Thanks for looking at this, Keith! I've tried to make a version that
does the right thing with regard to the assertion failure. That does
not address the root cause of the problem, nor does it fix the centering
thing you pointed out. Quite lacklustre.
https://codereview.appspot.com/572550043/
https://codereview.appspot.com/572550043/diff/560590043/lily/stem-tremolo.cc
File lily/stem-tremolo.cc (left):
https://codereview.appspot.com/572550043/diff/560590043/lily/stem-tremolo.cc#oldcode175
lily/stem-tremolo.cc:175: Interval ph = stem->pure_y_extent (stem, 0,
INT_MAX);
My suggested cha
If I understand, the example
\relative { a32 8..:32 }
fails the assertion in the call to center() on line 182, because the
interval 'ph' is empty.
There are several problems in the existing code, that would seem to
prevent it from working. The proposed change deviates further from what
seems t
