staff-symbol-referencer: ledger logic; issue 4184 (issue 167040043 by address@hidden)

[lemzwerg]

LGTM


https://codereview.appspot.com/167040043/diff/1/lily/side-position-interface.cc
File lily/side-position-interface.cc (right):

https://codereview.appspot.com/167040043/diff/1/lily/side-position-interface.cc#newcode383
lily/side-position-interface.cc:383: /* If we are closer to the staff
than the notehad, quantize for ledger lines. */
s/notehad/notehead/

But I wonder whether this is the best description – it's rather about
note heads and attached grobs having the same direction, right?

https://codereview.appspot.com/167040043/