Issue 1614 in lilypond: DynamicTextSpanner documentation is wrong

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Documentation Priority-Medium

New issue 1614 by address@hidden: DynamicTextSpanner  
documentation is wrong
http://code.google.com/p/lilypond/issues/detail?id=1614

From Olexa Bilaniuk:

While trying to create a custom crescendo in LilyPond 2.13.59 and 2.12.3, I  
came up against what I believe is a bug in DynamicTextSpanner's style  
override : When I set 'style to 'hairpin, what is printed out is a straight  
line, identical to the result of setting style to 'line, or anything other  
than dashed-line or dotted-line for that matter. The code that triggers the  
bug here is lifted (save for the change to 'hairpin) straight from Snippets  
-> Expressive marks -> Changing text and spanner styles for text dynamics,  
and though the description claims that 'hairpin is a valid style, it  
clearly is not here. Erroneous output
is in red.

\version "2.13.59"

\relative c'' {
  \set crescendoText = \markup { \italic { cresc. poco } }
  \set crescendoSpanner = #'text
  \override DynamicTextSpanner #'style = #'line
  a2\< a
  a2 a
  a2 a
  a2 a\mf
  \once \override DynamicTextSpanner #'color = #red
  \override DynamicTextSpanner #'style = #'hairpin
  a2\< a
  a2 a
  a2 a
  a2 a\mf
}