Re: staffSize music function unreliable at LP v2.19.16

2015-03-04 Thread Simon Albrecht

Hello,

a possible workaround would be to insert

\layout {
  \context { \Voice
 \override Stem.neutral-direction = #'()
 \consists Melody_engraver }
}

It computes the stem direction for neutral-position (i.e. normally the 
center staff line) and here also the wrongly flipped f’s such as to suit 
the surrounding notes.


HTH, Simon

Am 03.03.2015 um 15:37 schrieb Cynthia Karl:

The following snippet:

\version 2.19.15

staffSize = #(define-music-function (parser location new-size) (number?)
#{
  \set fontSize = #new-size
  \override StaffSymbol #'staff-space = #(magstep new-size)
  \override StaffSymbol #'thickness   = #(magstep new-size)
#})

Ab = \relative c' { f4 g a b  }

\score {
\new Staff  \with { \staffSize #2  { \Ab }
\layout {}
}

produces at LP v2.19.15:


but at LP v2.19.16 produces:


Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13), 
this causes many scores to require an additional page.


Applying convert-ly to the above snippet changes only the \version number.

I tried all values for new-size between -8 and +8; the only ones that 
failed were -4 and 2.


(The staffSize music-function was kindly contributed by Eluze in 2013 
on this list to overcome limitations of layout-set-staff-size.)







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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread James Worlton
I should add that the original code was missing a right closing brace after
\staffSize #2 to close off the \with block.

James Worlton

On Tue, Mar 3, 2015 at 9:19 AM, James Worlton jworl...@gmail.com wrote:

 On Tue, Mar 3, 2015 at 8:37 AM, Cynthia Karl pck...@mac.com wrote:

 The following snippet:

 \version 2.19.15

 staffSize = #(define-music-function (parser location new-size) (number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol #'staff-space = #(magstep new-size)
   \override StaffSymbol #'thickness   = #(magstep new-size)
 #})

 Ab = \relative c' { f4 g a b  }

 \score {
 \new Staff  \with { \staffSize #2  { \Ab }
 \layout { }
 }

 produces at LP v2.19.15:


 but at LP v2.19.16 produces:


 Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13),
 this causes many scores to require an additional page.

 Applying convert-ly to the above snippet changes only the \version number.

 I tried all values for new-size between -8 and +8; the only ones that
 failed were -4 and 2.

 (The staffSize music-function was kindly contributed by Eluze in 2013 on
 this list to overcome limitations of layout-set-staff-size.)


 I have been able to reproduce the problem on Windows 7 with Frescobaldi
 2.17.2.

 Additionally I found that sizes of 2.1, 1.4, 1.1, 0.7, 0.5, -0.2, -0.3,
 -0.6, -1.3, -1.4, -2.1 also created the down stem on the F. (I only tested
 2.1 to -2.1).

 James Worlton



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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Phil Holmes
I can confirm the problem on windows.  Using a greater range of notes produces 
some interesting output...

--
Phil Holmes


  - Original Message - 
  From: Pierre Perol-Schneider 
  To: James Worlton 
  Cc: Cynthia Karl ; lilypond-user 
  Sent: Tuesday, March 03, 2015 3:26 PM
  Subject: Re: staffSize music function unreliable at LP v2.19.16


  No problem on my side (see attached).

  OS : Ubuntu 14.10

  Frescobaldi 2.13

  LP 2.19.16


  Here's a compilable code:

  \version 2.19.16

  staffSize = #(define-music-function (parser location new-size) 
 (number?)
  #{
\set fontSize = #new-size
\override StaffSymbol.staff-space = #(magstep new-size)
\override StaffSymbol.thickness = #(magstep new-size)
  #})

  Ab = \relative c' { f4 g a b  }

  \score {
\new Staff  \with { \staffSize #2 } { \Ab } 
\layout { }
  }


  Cheers,

  Pierre






  2015-03-03 16:19 GMT+01:00 James Worlton jworl...@gmail.com:

On Tue, Mar 3, 2015 at 8:37 AM, Cynthia Karl pck...@mac.com wrote:

  The following snippet:


  \version 2.19.15

  staffSize = #(define-music-function (parser location new-size) (number?)
  #{
\set fontSize = #new-size
\override StaffSymbol #'staff-space = #(magstep new-size)
\override StaffSymbol #'thickness   = #(magstep new-size)
  #})

  Ab = \relative c' { f4 g a b  }

  \score {
  \new Staff  \with { \staffSize #2  { \Ab }
  \layout { }
  }


  produces at LP v2.19.15:





  but at LP v2.19.16 produces:





  Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13), 
this causes many scores to require an additional page.


  Applying convert-ly to the above snippet changes only the \version number.


  I tried all values for new-size between -8 and +8; the only ones that 
failed were -4 and 2.


  (The staffSize music-function was kindly contributed by Eluze in 2013 on 
this list to overcome limitations of layout-set-staff-size.)




I have been able to reproduce the problem on Windows 7 with Frescobaldi 
2.17.2. 


Additionally I found that sizes of 2.1, 1.4, 1.1, 0.7, 0.5, -0.2, -0.3, 
-0.6, -1.3, -1.4, -2.1 also created the down stem on the F. (I only tested 2.1 
to -2.1).


James Worlton





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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread James Worlton
On Tue, Mar 3, 2015 at 8:37 AM, Cynthia Karl pck...@mac.com wrote:

 The following snippet:

 \version 2.19.15

 staffSize = #(define-music-function (parser location new-size) (number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol #'staff-space = #(magstep new-size)
   \override StaffSymbol #'thickness   = #(magstep new-size)
 #})

 Ab = \relative c' { f4 g a b  }

 \score {
 \new Staff  \with { \staffSize #2  { \Ab }
 \layout { }
 }

 produces at LP v2.19.15:


 but at LP v2.19.16 produces:


 Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13), this
 causes many scores to require an additional page.

 Applying convert-ly to the above snippet changes only the \version number.

 I tried all values for new-size between -8 and +8; the only ones that
 failed were -4 and 2.

 (The staffSize music-function was kindly contributed by Eluze in 2013 on
 this list to overcome limitations of layout-set-staff-size.)


I have been able to reproduce the problem on Windows 7 with Frescobaldi
2.17.2.

Additionally I found that sizes of 2.1, 1.4, 1.1, 0.7, 0.5, -0.2, -0.3,
-0.6, -1.3, -1.4, -2.1 also created the down stem on the F. (I only tested
2.1 to -2.1).

James Worlton
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Pierre Perol-Schneider
No problem on my side (see attached).
OS : Ubuntu 14.10
Frescobaldi 2.13
LP 2.19.16

Here's a compilable code:

\version 2.19.16

staffSize = #(define-music-function (parser location new-size)
   (number?)
#{
  \set fontSize = #new-size
  \override StaffSymbol.staff-space = #(magstep new-size)
  \override StaffSymbol.thickness = #(magstep new-size)
#})

Ab = \relative c' { f4 g a b  }

\score {
  \new Staff  \with { \staffSize #2 } { \Ab }
  \layout { }
}

Cheers,
Pierre



2015-03-03 16:19 GMT+01:00 James Worlton jworl...@gmail.com:

 On Tue, Mar 3, 2015 at 8:37 AM, Cynthia Karl pck...@mac.com wrote:

 The following snippet:

 \version 2.19.15

 staffSize = #(define-music-function (parser location new-size) (number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol #'staff-space = #(magstep new-size)
   \override StaffSymbol #'thickness   = #(magstep new-size)
 #})

 Ab = \relative c' { f4 g a b  }

 \score {
 \new Staff  \with { \staffSize #2  { \Ab }
 \layout { }
 }

 produces at LP v2.19.15:


 but at LP v2.19.16 produces:


 Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13),
 this causes many scores to require an additional page.

 Applying convert-ly to the above snippet changes only the \version number.

 I tried all values for new-size between -8 and +8; the only ones that
 failed were -4 and 2.

 (The staffSize music-function was kindly contributed by Eluze in 2013 on
 this list to overcome limitations of layout-set-staff-size.)


 I have been able to reproduce the problem on Windows 7 with Frescobaldi
 2.17.2.

 Additionally I found that sizes of 2.1, 1.4, 1.1, 0.7, 0.5, -0.2, -0.3,
 -0.6, -1.3, -1.4, -2.1 also created the down stem on the F. (I only tested
 2.1 to -2.1).

 James Worlton



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CK.pdf
Description: Adobe PDF document
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Kevin Barry
The problem also exists on OSX (10.9.5) with 2.19.16.

2.18.2 still does it correctly.

I will test my linux machine later.

I'd say this constitutes a regression? The staffSize function doesn't seem
to do anything fancy or unusual.

On Tue, Mar 3, 2015 at 3:47 PM, Phil Holmes m...@philholmes.net wrote:

  I can confirm the problem on windows.  Using a greater range of notes
 produces some interesting output...

 --
 Phil Holmes



 - Original Message -
 *From:* Pierre Perol-Schneider pierre.schneider.pa...@gmail.com
 *To:* James Worlton jworl...@gmail.com
 *Cc:* Cynthia Karl pck...@mac.com ; lilypond-user
 lilypond-user@gnu.org
 *Sent:* Tuesday, March 03, 2015 3:26 PM
 *Subject:* Re: staffSize music function unreliable at LP v2.19.16

No problem on my side (see attached).
 OS : Ubuntu 14.10
 Frescobaldi 2.13
 LP 2.19.16

 Here's a compilable code:

 \version 2.19.16

 staffSize = #(define-music-function (parser location new-size)
(number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol.staff-space = #(magstep new-size)
   \override StaffSymbol.thickness = #(magstep new-size)
 #})

 Ab = \relative c' { f4 g a b  }

 \score {
   \new Staff  \with { \staffSize #2 } { \Ab }
   \layout { }
 }

 Cheers,
 Pierre



 2015-03-03 16:19 GMT+01:00 James Worlton jworl...@gmail.com:

   On Tue, Mar 3, 2015 at 8:37 AM, Cynthia Karl pck...@mac.com wrote:

  The following snippet:

 \version 2.19.15

 staffSize = #(define-music-function (parser location new-size) (number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol #'staff-space = #(magstep new-size)
   \override StaffSymbol #'thickness   = #(magstep new-size)
 #})

 Ab = \relative c' { f4 g a b  }

 \score {
 \new Staff  \with { \staffSize #2  { \Ab }
 \layout { }
 }

 produces at LP v2.19.15:


 but at LP v2.19.16 produces:


 Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13),
 this causes many scores to require an additional page.

 Applying convert-ly to the above snippet changes only the \version
 number.

 I tried all values for new-size between -8 and +8; the only ones that
 failed were -4 and 2.

 (The staffSize music-function was kindly contributed by Eluze in 2013 on
 this list to overcome limitations of layout-set-staff-size.)


 I have been able to reproduce the problem on Windows 7 with Frescobaldi
 2.17.2.

 Additionally I found that sizes of 2.1, 1.4, 1.1, 0.7, 0.5, -0.2, -0.3,
 -0.6, -1.3, -1.4, -2.1 also created the down stem on the F. (I only tested
 2.1 to -2.1).

 James Worlton



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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread David Nalesnik
Harm,

On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley thomasmorle...@gmail.com
wrote:


 thanks for testing. So this function may use as a test-case.

 No idea whats causing this bug, though. And because I'm not able to
 reproduce it, I can't help furthermore :(


I don't think I could do anything either.  I wouldn't know how to build
LilyPond for Windows to verify any fix...

--David
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread James Worlton
I've attached the PDF output of your code, as run on my machine: Windows 7,
Frescobaldi 2.17.2, Lily 2.19.16.

James Worlton


On Tue, Mar 3, 2015 at 2:59 PM, Thomas Morley thomasmorle...@gmail.com
wrote:



 2015-03-03 17:34 GMT+01:00 Kevin Barry barr...@gmail.com:

 The problem also exists on OSX (10.9.5) with 2.19.16.

 2.18.2 still does it correctly.

 I will test my linux machine later.

 I'd say this constitutes a regression? The staffSize function doesn't
 seem to do anything fancy or unusual.

 On Tue, Mar 3, 2015 at 3:47 PM, Phil Holmes m...@philholmes.net wrote:

  I can confirm the problem on windows.  Using a greater range of notes
 produces some interesting output...

 --
 Phil Holmes


 Can't confirm on my Linux-machine.

 I tried to write some test-function, though.
 It puts out a StaffGroup with 81 Staves with different sizes on a huge
 paper.
 View with zoom. ;)

 Can someone on windows/OSX confirm buggy output at certain sizes?


 \version 2.19.16

 #(set-default-paper-size b0)

 staffSize = #(define-music-function (parser location new-size) (number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol #'staff-space = #(magstep new-size)
   \override StaffSymbol #'thickness   = #(magstep new-size)
 #})

 mus = \relative c' { f4 g a b  }

 \new StaffGroup 
   $@(map
  (lambda (size nmbr)
#{
  \new Staff
  \with {
   instrumentName =
   \markup
 \abs-fontsize #10
 #(format #f Staff Nr. ~a, with staffSize: ~a nmbr size)
   \staffSize $size
  }
  \mus
#})
  (iota 81 4 -0.1)
  (iota 81 1))
 


 Cheers,
   Harm

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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread SoundsFromSound
Cynthia Karl wrote
 The following snippet:
 
 \version 2.19.15
 
 staffSize = #(define-music-function (parser location new-size) (number?)
 #{
   \set fontSize = #new-size
   \override StaffSymbol #'staff-space = #(magstep new-size)
   \override StaffSymbol #'thickness   = #(magstep new-size)
 #})
 
 Ab = \relative c' { f4 g a b  }
 
 \score {
 \new Staff  \with { \staffSize #2  { \Ab }
   \layout {   }
 }
 
 produces at LP v2.19.15:
 
 
 
 but at LP v2.19.16 produces:
 
 
 
 Besides being wrong (see, e.g., Behind Bars by Elaine Gould, p.13), this
 causes many scores to require an additional page.
 
 Applying convert-ly to the above snippet changes only the \version number.
 
 I tried all values for new-size between -8 and +8; the only ones that
 failed were -4 and 2.
 
 (The staffSize music-function was kindly contributed by Eluze in 2013 on
 this list to overcome limitations of layout-set-staff-size.)
 
 
 
 
 
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 lilypond-user@

 https://lists.gnu.org/mailman/listinfo/lilypond-user
 
 
 Screen Shot 2015-03-03 at 8.24.10 AM.png (12K)
 lt;http://lilypond.1069038.n5.nabble.com/attachment/172534/0/Screen%20Shot%202015-03-03%20at%208.24.10%20AM.pnggt;
 Screen Shot 2015-03-03 at 8.24.24 AM.png (12K)
 lt;http://lilypond.1069038.n5.nabble.com/attachment/172534/1/Screen%20Shot%202015-03-03%20at%208.24.24%20AM.pnggt;

Hi all,

I'm not able to reproduce this on my Debian (KDE) machine using Frescobaldi
2.17.2 and LilyPond 2.19.16.

I'm trying...maybe I'm missing something? Sorry, trying to help!

Ben



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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread David Nalesnik
On Tue, Mar 3, 2015 at 3:44 PM, David Nalesnik david.nales...@gmail.com
wrote:

 Harm,

 On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley thomasmorle...@gmail.com
 wrote:


 thanks for testing. So this function may use as a test-case.

 No idea whats causing this bug, though. And because I'm not able to
 reproduce it, I can't help furthermore :(


 I don't think I could do anything either.  I wouldn't know how to build
 LilyPond for Windows to verify any fix...


An observation.  In the following snippet, you'll note in the log output
 that the default-direction of the downstemmed F and B is 0--CENTER.  This
means that Stem::calc-direction (in lily/stem.cc) will take the property
'neutral-direction.  This property is supposed to specify the direction of
a note on the midline--B only in our case.  F should have a
default-direction of 1.

 \version 2.19.16

staffSize = #(define-music-function (parser location new-size)
   (number?)
#{
  \set fontSize = #new-size
  \override StaffSymbol.staff-space = #(magstep new-size)
  \override StaffSymbol.thickness = #(magstep new-size)
#})

Ab = \relative c' { f4 g a b c d e f }

\score {
  \new Staff  \with { \staffSize #2 }
  {
\override Stem.after-line-breaking =
#(lambda (grob)
   (format #t ~a default-direction: ~a~%
 grob
 (ly:grob-property grob 'default-direction)))
\Ab
  }
  \layout { }
}
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread David Nalesnik
On Tue, Mar 3, 2015 at 3:59 PM, David Nalesnik david.nales...@gmail.com
wrote:



 On Tue, Mar 3, 2015 at 3:44 PM, David Nalesnik david.nales...@gmail.com
 wrote:

 Harm,

 On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley thomasmorle...@gmail.com
 wrote:


 thanks for testing. So this function may use as a test-case.

 No idea whats causing this bug, though. And because I'm not able to
 reproduce it, I can't help furthermore :(


 I don't think I could do anything either.  I wouldn't know how to build
 LilyPond for Windows to verify any fix...


 An observation.  In the following snippet, you'll note in the log output
  that the default-direction of the downstemmed F and B is 0--CENTER.  This
 means that Stem::calc-direction (in lily/stem.cc) will take the property
 'neutral-direction.  This property is supposed to specify the direction of
 a note on the midline--B only in our case.  F should have a
 default-direction of 1.


Note that adding

\override Stem.neutral-direction = #1

fixes the problem for the bad stems.

David
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Thomas Morley
2015-03-03 17:34 GMT+01:00 Kevin Barry barr...@gmail.com:

 The problem also exists on OSX (10.9.5) with 2.19.16.

 2.18.2 still does it correctly.

 I will test my linux machine later.

 I'd say this constitutes a regression? The staffSize function doesn't seem
 to do anything fancy or unusual.

 On Tue, Mar 3, 2015 at 3:47 PM, Phil Holmes m...@philholmes.net wrote:

  I can confirm the problem on windows.  Using a greater range of notes
 produces some interesting output...

 --
 Phil Holmes


Can't confirm on my Linux-machine.

I tried to write some test-function, though.
It puts out a StaffGroup with 81 Staves with different sizes on a huge
paper.
View with zoom. ;)

Can someone on windows/OSX confirm buggy output at certain sizes?


\version 2.19.16

#(set-default-paper-size b0)

staffSize = #(define-music-function (parser location new-size) (number?)
#{
  \set fontSize = #new-size
  \override StaffSymbol #'staff-space = #(magstep new-size)
  \override StaffSymbol #'thickness   = #(magstep new-size)
#})

mus = \relative c' { f4 g a b  }

\new StaffGroup 
  $@(map
 (lambda (size nmbr)
   #{
 \new Staff
 \with {
  instrumentName =
  \markup
\abs-fontsize #10
#(format #f Staff Nr. ~a, with staffSize: ~a nmbr size)
  \staffSize $size
 }
 \mus
   #})
 (iota 81 4 -0.1)
 (iota 81 1))



Cheers,
  Harm
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Thomas Morley
2015-03-03 22:15 GMT+01:00 David Nalesnik david.nales...@gmail.com:
 Harm,

 On Tue, Mar 3, 2015 at 2:59 PM, Thomas Morley thomasmorle...@gmail.com
 wrote:



 2015-03-03 17:34 GMT+01:00 Kevin Barry barr...@gmail.com:

 The problem also exists on OSX (10.9.5) with 2.19.16.

 2.18.2 still does it correctly.

 I will test my linux machine later.

 I'd say this constitutes a regression? The staffSize function doesn't
 seem to do anything fancy or unusual.

 On Tue, Mar 3, 2015 at 3:47 PM, Phil Holmes m...@philholmes.net wrote:

 I can confirm the problem on windows.  Using a greater range of notes
 produces some interesting output...

 --
 Phil Holmes


 Can't confirm on my Linux-machine.


 Nor on my VM.



 I tried to write some test-function, though.
 It puts out a StaffGroup with 81 Staves with different sizes on a huge
 paper.
 View with zoom. ;)

 Can someone on windows/OSX confirm buggy output at certain sizes?


 Yes, under Windows 7 64-bit, I get the flipped F at the following sizes:

 3.9, 2.0, 1.4, 1.1, 0.7, 0.5, -0.1, -0.2, -0.3, -0.6, -1.3, -1.4, -3.9. -4.0

 --David


James, David,

thanks for testing. So this function may use as a test-case.

No idea whats causing this bug, though. And because I'm not able to
reproduce it, I can't help furthermore :(


-Harm

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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread David Nalesnik
Harm,

On Tue, Mar 3, 2015 at 2:59 PM, Thomas Morley thomasmorle...@gmail.com
wrote:



 2015-03-03 17:34 GMT+01:00 Kevin Barry barr...@gmail.com:

 The problem also exists on OSX (10.9.5) with 2.19.16.

 2.18.2 still does it correctly.

 I will test my linux machine later.

 I'd say this constitutes a regression? The staffSize function doesn't
 seem to do anything fancy or unusual.

 On Tue, Mar 3, 2015 at 3:47 PM, Phil Holmes m...@philholmes.net wrote:

  I can confirm the problem on windows.  Using a greater range of notes
 produces some interesting output...

 --
 Phil Holmes


 Can't confirm on my Linux-machine.


Nor on my VM.



 I tried to write some test-function, though.
 It puts out a StaffGroup with 81 Staves with different sizes on a huge
 paper.
 View with zoom. ;)

 Can someone on windows/OSX confirm buggy output at certain sizes?


Yes, under Windows 7 64-bit, I get the flipped F at the following sizes:

3.9, 2.0, 1.4, 1.1, 0.7, 0.5, -0.1, -0.2, -0.3, -0.6, -1.3, -1.4, -3.9. -4.0

--David
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Keith OHara
Simon Albrecht simon.albrecht at mail.de writes:
 
 Well, there’s reason enough to redirect this to bug-lilypond, isn’t
 it? 

Thanks for finding the bug, and confirming that it is a bug and not just
a misunderstanding, and narrowing down the cause, and posting to bug-lilypond.

The relevant code did not change, but the version of GCC used as a cross-
operating-system compiler did change.  Some very useful programming
languages, including C,have details where behavior is allowed to vary
between systems, and here it seems LilyPond inadvertently depended on one
of those details.

There will probably be a couple more of these strange bugs in 2.19.16
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread David Nalesnik
On Tue, Mar 3, 2015 at 4:35 PM, Simon Albrecht simon.albre...@mail.de
wrote:

  Well, there’s reason enough to redirect this to bug-lilypond, isn’t it?
 Somehow, Mozilla Thunderbird messes up the code examples, so I can’t do so
 well. Perhaps the OP’s and Harm’s first mails in the thread, respectively,
 should suffice for illustration.

 ~Simon


You might add that it appears to be a problem related to the calculation of
Stem.default-direction which appears when staff-space is changed.

--David
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Re: staffSize music function unreliable at LP v2.19.16

2015-03-03 Thread Simon Albrecht
Well, there’s reason enough to redirect this to bug-lilypond, isn’t it? 
Somehow, Mozilla Thunderbird messes up the code examples, so I can’t do 
so well. Perhaps the OP’s and Harm’s first mails in the thread, 
respectively, should suffice for illustration.


~Simon

Am 03.03.2015 um 23:01 schrieb David Nalesnik:



On Tue, Mar 3, 2015 at 3:59 PM, David Nalesnik 
david.nales...@gmail.com mailto:david.nales...@gmail.com wrote:




On Tue, Mar 3, 2015 at 3:44 PM, David Nalesnik
david.nales...@gmail.com mailto:david.nales...@gmail.com wrote:

Harm,

On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley
thomasmorle...@gmail.com mailto:thomasmorle...@gmail.com
wrote:


thanks for testing. So this function may use as a test-case.

No idea whats causing this bug, though. And because I'm
not able to
reproduce it, I can't help furthermore :(


I don't think I could do anything either.  I wouldn't know how
to build LilyPond for Windows to verify any fix...


An observation.  In the following snippet, you'll note in the log
output  that the default-direction of the downstemmed F and B is
0--CENTER.  This means that Stem::calc-direction (in lily/stem.cc)
will take the property 'neutral-direction.  This property is
supposed to specify the direction of a note on the midline--B only
in our case.  F should have a default-direction of 1.


Note that adding

\override Stem.neutral-direction = #1

fixes the problem for the bad stems.

David



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