#2852 horizontal spacing: columns with spacers are spaced differently than those with notes (see comment #4)

[Anonymous]

Originally created by: *anonymous

Originally created by: k-ohara5...@oco.net

Note-spacing involving spacer rests is strange enough that there might be a small bug or two.  I'll call this "Type-ugly" because it makes the simplest way of writing a delayed turn a bit ugly.

When we write explicit spacers, such as to place a delayed turn, we often want the columns created by these spacer rests to be spaced like normal note-columns.  That is, spaced as if there were non-interfering notes in some other voice or staff at the times of the spacers.  (This desire might conflict with LilyPond's current methods to support ligatures in ancient music, which use a lot of empty columns.)

\new Staff <<
  { a'2  a' | a' a' | d' d' } \\
  { s4 c' r s | r c' r c' | s s^\turn s s } >>

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Originally posted by: dak@gnu.org

One idea:

\layout {
  \context { \Staff
         \consists
         #(make-engraver
           (listeners ((skip-event eng ev)
               (ly:engraver-make-grob eng 'NonMusicalPaperColumn ev))))
         }
  }

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Originally posted by: janek.li...@gmail.com

Keith,
do you consider the spacing of the quarter note in the first measure a problem, or is this issue only about the turn placement?

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Originally posted by: k-ohara5...@oco.net

The bug report says "might be a small bug or two".  The quarter note in the first measure is spaced differently than it is with regular notes and rests, but optically it looks fine.  I included that as an intermediate case, trying to figure out what affects the placement of the second beat in each measure.  It is only a bug if the spacing is different from what we or the original programmers wanted.

The turn in the third measure is spaced in a way that surprises people who want to write a delayed turn.

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Originally posted by: janek.li...@gmail.com

Oh, i've just now discovered issue 3232.  As far as i can see, it covers the bad turn case from this issue; i'll write a detailed comment there.

As for the quarter note spacing, there is actually a bug, but it gets visible only when the spacing gets tight:

\version "2.17.13"

\paper {
  % this is just to force lily to typeset the snippet tightly:
  system-count = 1
  ragged-right = ##f
  indent = 0
  line-width = 4.5\cm
}

\new Staff <<
  { a'2  a' | a' a' }
  \\   { s4 c' r s | r c' r c' }
>>

So, let this issue track the problem with note spacing, not with the turn.

Summary: horizontal spacing: columns with spacers are spaced differently than those with notes (see comment #4)

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Originally posted by: janek.li...@gmail.com

Actually, the turn thing is now issue 3299.