Re: Issue 1290 in lilypond: Skyline compaction is going overboard sometimes

[lilypond]

Comment #5 on issue 1290 by address@hidden: Skyline compaction is  
going overboard sometimes
http://code.google.com/p/lilypond/issues/detail?id=1290

> 1) change the default horizontal padding to match the 2.12 version

Already matched: skylines-horizontal-padding = 0 for both 2.12 and 2.13.   
The skylines drape tightly over the grobs (see image).

> 2) write better docs

The example involves systems containing notes that protrude further than  
the default spacing between systems, on a ragged-bottom page.  The desired  
behavior is to space the systems further apart due to the near collision.   
The documentation indicates system-system-spacing 'padding for this  
purpose.  This variables default value has, in fact, been reduced relative  
to the 2.12 equivalent, from 4 mm to 1 staff space.

Increasing system-system-spacing 'padding to 2.2 staff spaces restores the  
2.12 behavior (image) without objectionable effect on the scores I compiled  
for the spacing-adjustments review.

To make this the default, in paper-defaults-init.ly,
+  system-system-spacing = #'((space . 12) (minimum-distance . 8)  
(padding . 2.2))
-  system-system-spacing = #'((space . 12) (minimum-distance . 8)  
(padding . 1))
+  score-system-spacing = #'((space . 14) (minimum-distance . 8) (padding .  
2.2))
-  score-system-spacing = #'((space . 14) (minimum-distance . 8) (padding .  
1))

No change to the other paddings needed, in response to this issue, because  
the objects they affect are not intended to have such big protrusions.

--8<--
#(ly:set-option 'debug-skylines #t)
\paper {  indent = #0    ragged-bottom = ##t
  system-system-spacing #'padding = 2.2
}
\new Staff  \with {
  \override TimeSignature #'stencil = ##f
} {
  \repeat unfold 24 { c'''' c, }
}

Attachments:
        1290.png  29.8 KB