Vertical alignment of stuff added to an align-interface

[Reinhold Kainhofer]

For fixing the figured bass alignment (i.e. the <4> <6 4> case with extenders 
turned onn), I have a problem with the vertical alignment:

<8 6 4> <8 5 3>

Should appear as
8----
6   5
4   3

I'm adding the elements to the BassFigureAlignment so that its elements list 
is:
8 (spanner over both times)
6 (time 1)
4 (time 1)
5 (time 2)
3 (time 2)

Or displayed differently:

1:   8----
2:   6
3:   4
4:       5
5:       3

Unfortunately, it seems that ly:align-interface::align-to-minimum-distances 
(the positioning-done property of BassFigureAlignmen) moves the 5 only to the 
same position as the 4, so the output is:
8----
6    
4   5
    3

How can I get the BassFigureAlignment to move up the 5 further than the y-
position of the previous item (the 4) in the elements list?

Thanks,
Reinhold


-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org