Issue 1662 in lilypond: midi & pdf disagree with conflicting tempo-changes

[lilypond]

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

New issue 1662 by address@hidden: midi & pdf disagree with  
conflicting tempo-changes
http://code.google.com/p/lilypond/issues/detail?id=1662

Reported by Mark Polesky:
Hey guys,

When simultaneous tempo changes disagree:

1) a message reports "junking" all but the first one found;
2) and the first one found is printed in the pdf;
3) but the *last* one found is used for the midi output.

This is inconsistent and should be fixed!

Here's a small file demonstrating the problem:

********************

\version "2.13.59"

\score {
  \new PianoStaff <<
    \new Staff \relative c'' {
      \tempo 4=60
      c8 d e f g a b c
    }
    \new Staff \relative c' {
      \tempo 4=120
      c8 d e f g a b c
    }
    \new Staff \relative c {
      \clef bass
      \tempo 4=240
      c8 d e f g a b c
    }
  >>
  \layout {}
  \midi {}
}
****************************
The warnings appear with 2.13.61 and 2.15.0; 2.12.3 produces no warnings  
but only displays the last tempo in the .pdf