Fw: [testlilyissues:issues] #4975 [Windows] Grace notes cause staff to protrude into the margin

[Trevor]

Found the original message ...

Trevor

------ Forwarded Message ------
From: "Jean Abou Samra" <address@hidden>
To: "[testlilyissues:issues] " 
<address@hidden>
Sent: 14/07/2019 21:07:26
Subject: [testlilyissues:issues] #4975 [Windows] Grace notes cause staff 
to protrude into the margin

Also reported on Mac OS (at least 10.12.6 Sierra [me] and 10.13.6 High Sierra 
[Michael Hendry]) with LilyPond 2.21.0, but _not_  LilyPond 2.19.83, quite 
surprisingly as the bug appeared with 2.19.19 on Windows. Both above examples 
are reproduced, and I can add a third one:
```
\version "2.21.0"
\relative {
c'1
\acciaccatura { bes8 } c1
}
```
Full outputs and logs on the three examples using 2.21.0, 2.19.83 and 2.18.2 
are available in the attached archive.
Two additional remarks:
* On the first example, "mis-predicted force" programming errors show up, and 
yet the output is perfectly normal, the staff doesn't protrude.
* On the last example, the bug is triggered as soon as the grace note is 
altered, no matter the alteration and no matter wether \acciaccatura or \grace 
is used.
Hope that helps!



---

** [issues:#4975] [Windows] Grace notes cause staff to protrude into the 
margin**

**Status:** Started
**Created:** Sun Sep 18, 2016 11:07 PM UTC by Simon Albrecht
**Last Updated:** Sun Jul 14, 2019 07:23 PM UTC
**Owner:** Phil Holmes


http://lilypond.1069038.n5.nabble.com/Grace-notes-and-staff-miss-alignment-tp181529p188186.html
As reported by Karol and confirmed by Pierre, this code

~~~~
:::TeX
\version "2.19.48"

\transpose c c' {
  \repeat unfold 16 { e'8 a }
  R1*8
}

\transpose c c' {
  \repeat unfold 16 { \grace dis'8 e' \grace gis8 a }
  R1*8
}
~~~~

under Windows (at least 7 and 8) causes lots of `programming error: 
mis-predicted force` and has the last staff flow into the margin.
Output at <http://lilypond.1069038.n5.nabble.com/file/n188186/ttttttt.pdf>

The first bad version is 2.19.19.


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