Comment #4 on issue 1695 by [email protected]: Clef change placed outside score
http://code.google.com/p/lilypond/issues/detail?id=1695
1d4914c023a672e0e80b9b9eafc123605f4c0f00 is the first really bad commit (my initial commit is also a bit weird, but it's the tempo mark which is wrongly positioned in that case. :)
It looks like a Break_align_engraver problem: despite the MetronomeMark being aligned on a note, it's still acknowledged as a break-alignable object. It gets a BreakAlignment as a temporary X-parent (until the Metronome_engraver changes it at the end of the timestep), which interferes with the loose column the clef's attached to.
I think we can use 'non-musical to prevent this: if it's set in Metronome_engraver when we're sure the MetronomeMark *is* non-musical (i.e., not positioned over a note or rest), it should be easy to filter out any mark which doesn't need the services of the Break_align_engraver.
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