Re: Issue 1513 in lilypond: Figured bass extenders do not line up

[lilypond]

Comment #2 on issue 1513 by address@hidden: Figured bass extenders  
do not line up
http://code.google.com/p/lilypond/issues/detail?id=1513

That patch is needed to ensure that all extenders stop at the same  
horizontal position (independent of the figure's actuall width). Other wise  
the extender of a 4+ figure would be longer thant the extender of a 5  
figure. If they appear at the same time, this looks awfull.

Unfortunately, I have not yet found the perfect solution to the problem.  
The above mentioned patch makes all hidden figures (i.e. the right edge of  
the extender) behave like they have a figure "0", thus forcing them to end  
at the same position. Unfortunately, this messes up the Y extent/position  
if the extender does not come from a digit.

What I would really need is a way to make the right edge of the extender  
behave as if it has the Y extent of the original figure and the X extent of  
a single digit (in all cases, even if the figure is something completely  
different). Unfortunately, the engraver only sets the text property as  
markup (which is then processed by ly:text-interface::print), so I don't  
have access to the X and Y extent yet.

And in Figured_bass_continuation::print, where I have access to the extent,  
I don't know how to deal with the custom alignment of the figures (i.e. 4+,  
#5 and 6 exactly align the digits, but are then shifted by the widht of the  
#; Longer digits, e.g. "12" are then left aligned the resulting grob. So I  
can't take the left/right edge or the center of the markup, there).

So, I'm really at loss here how to properly make the extenders stop at the  
same position without messing up the Y position...