Issue 5258: let long rests hang from staff lines
This shifts the stencil by (staffspace - fontsize) so that the rests stay in
the same space but are hang from the upper line instead of standing on the
lower.
For one line staves, rests are moved one space down so that they hang.
Contains regtest.
http://codereview.appspot.com/332640043
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** [issues:#5258] Vertical breve rest position in TabStaff/RhythmicStaff**
**Status:** Started
**Created:** Sat Jan 13, 2018 04:47 PM UTC by Malte Meyn
**Last Updated:** Thu Jan 18, 2018 09:28 PM UTC
**Owner:** Malte Meyn
**Attachments:**
-
[breve_rests.png](https://sourceforge.net/p/testlilyissues/issues/5258/attachment/breve_rests.png)
(26.0 kB; image/png)
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[gould_breve_rests_oneline.png](https://sourceforge.net/p/testlilyissues/issues/5258/attachment/gould_breve_rests_oneline.png)
(27.9 kB; image/png)
According to Gould breve rests should hang from a one line staff
(RhythmicStaff) as semibreve rests do. Also, there is a comment in
multi-measure-rest.cc saying
```
// Staff position is somewhat icky regarding its definition for
// compatibility reasons. It is intended to be the baseline of
// a breve rest. However, when the staff space is more than
// single space (like with tablature), it looks better if all
// rests are actually hanging. So staff position, in reality,
// is the semi-breve position - 2. Everything else is
// calculated from there.
```
This confirms what Gould writes. But the code applies only to MMRs with a
measure-count > 1.
That leads to inconsistent behaviour: MultiMeasureRest breve glyphs hang, but
not for single measures. Rest breve glyphs don’t hang. Instead, all breve rests
should hang.
```
\version "2.19.80"
music = {
\compressFullBarRests
r1 R1 R\breve
\time 4/2
r\breve R\breve R\longa
\time 8/2
r\longa R\longa
}
\new TabStaff \with { \tabFullNotation } \music
\new RhythmicStaff \music
\new Staff \music
```
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