Re: Issue 2085 in lilypond: Overriding stencil of StringNumber leads to "programming error" messages

[lilypond]

Comment #2 on issue 2085 by address@hidden: Overriding stencil of  
StringNumber leads to "programming error" messages
http://code.google.com/p/lilypond/issues/detail?id=2085

This is probably caused in New_fingering_engraver, in the position_scripts  
() function.

To quote from the code:


184   /*
185     This is not extremely elegant, but we have to do a little
186     formatting here, because the parent/child relations should be
187     known before we move on to the next time step.
188
189     A more sophisticated approach would be to set both X and Y parents
190     to the note head, and write a more flexible function for
191     positioning the fingerings, setting both X and Y coordinates.
192   */


Thus, before we have checked whether or not any of the stencils are #f, we  
go ahead and put them in the grob structure.

A simple workaround for this issue would probably be to check to see if the  
stencil property of the grob is #f before doing the positioning.

The cleaner way would be to do the "more sophisticated" approach identified  
in the engraver code.