Comment #17 on issue 2727 by [email protected]: Patch: do not draw empty boxes
http://code.google.com/p/lilypond/issues/detail?id=2727
Should we not rather fix the caller if the box has negative dimensions ?
The negative dimensions came up in issue 2793. The fretboard code quite naturally generates reversed extents when rotating a fretboard.
Maybe we should more fully support that use of round_filled_box(). See the Rietveld comment.
