I've now done a closer look at the issue; it is indeed a rounding issue, as far
as I can see. mf2pt1 doesn't produce extremum outline points by itself; it is
FontForge which does that. The vertical coordinates of the extremum points in
`notehead.s2` are ±137.5 units; however, FontForge then rounds the coordinates
to integers, making them ±138 units, which is the largest delta possible to the
unrounded coordinates. I guess this is exactly the observed effect.
So: LGTM to Carl's change.
---
** [issues:#4693] Note heads don’t fit exactly between staff lines**
**Status:** Started
**Created:** Fri Dec 11, 2015 11:02 PM UTC by Simon Albrecht
**Last Updated:** Fri Feb 19, 2016 01:43 PM UTC
**Owner:** Carl Sorensen
As Gilberto reported
[here](https://lists.gnu.org/archive/html/bug-lilypond/2015-12/msg00047.html),
note heads in a default staff space extend the slightest bit above the upper
staff line.
Image example [here](http://lilypond.1069038.n5.nabble.com/file/n184659/48.png).
---
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