Re: [Lilypond-auto] Issue 1263 in lilypond: MetronomeMark can not be aligned on note if MMR in another voice

[lilypond]

Comment #10 on issue 1263 by address@hidden: MetronomeMark can not be  
aligned on note if MMR in another voice
http://code.google.com/p/lilypond/issues/detail?id=1263

> In key-clefs.ly, the tempo marks slide to the right of the key change

Those tempo marks are not the point of that regression test, merely labels  
to describe how the key signature should look.  They happen to be tempo  
changes with /only/ a multi-measure rest in the measure---no notes in any  
lower staves.

Where should the tempo go in that case?  The books I have (Ross, Stone) do  
not specify.

In the patch for issue 684, Neil gave his thoughts
  https://codereview.appspot.com/1579041#msg3
>   -) A metronome mark at a full-bar rest should be aligned with the barline
>      instead of the paper column to the left of the rest.
>   -) If there's a tempo change at a key signature, the metronome mark
>      shouldn't be aligned with the following note.
(Both differ with what I am used to seeing.)

If we want the tempo marks over the first note if there is one, but over  
the bar-line if there is /only/ a full-measure rest,
  \override Score.MetronomeMark #'non-break-align-symbols = #'(
      note-column-interface   multi-measure-rest-interface)