To be honest, there are many things I don't understand. In fact, I
reduced the example to understand it better.
Why is horizontal spacing affected even though the purity affects the
Y-axis only? Why do stems fix the spacing? Why doesn't this cause the
spacing problem:
\override NoteHead #'text = \markup { "o" }
\override NoteHead #'stencil = #ly:text-interface::print
But this does cause the problem:
\override NoteHead #'text = \markup { "o" }
\override NoteHead #'stencil =
#(lambda (grob) (ly:text-interface::print grob))
Cannot it happen a simple change would make Lilypond recognize lambda
expressions as pure functions, breaking this example? Maybe I removed
some future-proofing?
Perhaps some answers to those questions could be used to improve the
documentation.
http://codereview.appspot.com/5623044/
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