Hairpin minimum-length has not effect at end of line

[Wendl, Arnold]

>old bug, but in 2.15.95 a bit worse than in 2.14.2 and 2.12.3

\override Hairpin #'minimum-length is ignored at line breaks (manual and 
automatic).
The effect will be reduced, if the staff line is stretched a lot.

%\version "2.15.95"
%\version "2.12.3"
%\version "2.14.2"

\paper {
  ragged-right = ##t
}


\score {
  \new Staff {
    \override Hairpin #'minimum-length = #15
    << { c''1 c''} { s2\p\< s2\> s4\! } >> % no line break
    << { c''1 \break c''} { s2\p\< s2\> s4\! } >> % line break at end of
  }
%  \header {
%    piece = #(string-append "Version: " (lilypond-version))
%  }
}

Best regards,
ArnoldTheresius