Issue 1314 in lilypond: Hairpins should not collapse into flat lines

[lilypond]

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

New issue 1314 by v.villenave: Hairpins should not collapse into flat lines
http://code.google.com/p/lilypond/issues/detail?id=1314

% Reported by Arno months ago:
http://lists.gnu.org/archive/html/lilypond-devel/2010-03/msg00174.html

The following example does produce a "crescendo too small" warning. But  
should it happen at all? Is it really sensible not to have a minimum  
hairpin length (or angle) in order to prevent such things?

\version "2.13.36"

music = {
  c''1
}

\new StaffGroup <<
  \new Staff <<
    {s2.\pppp \< s4\! }
    \\ \music >>
  \new Staff \music


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