parentheses in figured bass not shown in lilypond-book (HTML output)

[Reinhold Kainhofer]

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Since I implemented figured bass conversion in musicxml2ly tonight, I created 
a test file with a figured bass in parentheses. They show up just fine in the 
PDF and the EPS output, but in the PNG output the square brackets are 
missing.

As an example, see the musicxml test file 18a-FiguredBass.xml in 
input/regression/musicxml. The lilypond code of the conversion is:
PartPOneVoiceOneFiguredBass =  \figuremode {
    <3>8 s8 <1+ 3- 5!>8. <[6]>16 <5/ 127/>4 }

In PDF, the <[6]> really appears as [6], but in PNG it displays only 6 without 
brackets:
http://kainhofer.com/~lilypond/input/regression/musicxml/collated-files.html#18a-FiguredBass.ly

What's wrong here?

Cheers,
Reinhold

- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: address@hidden, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
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